Strengthening mechanisms of materials

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interpretations of this phenomenon is that the extremely small grains are not able to support dislocation pileup which provides extra stress concentration in the large grains. At this point, the strengthening mechanism changes from dislocation-dominated strain hardening to growth softening and grain rotation. Typically, the inverse Hall-Petch effect will happens at grain size ranging from 10 nm to 30 nm and makes it hard for nanocrystalline materials to achieve a high strength. To push the limit of grain size for strengthening, the hindrance of grain rotation and growth could be achieved by grain boundary stabilization. The construction of nanolaminated structure with low-angle grain boundaries is one method to obtain ultrafine grained materials with ultra-strength. Lu et al. applied a very high rate shear deformation with high strain gradients on the top surface layer of bulk Ni sample and introduced nanolaminated structures. This material exhibits an ultra-high hardness, higher than any reported ultrafine-grained nickel. The exceptional strength is resulted from the appearance of low-angle grain boundaries, which have low-energy states efficient for enhancing structure stability. Another method to stabilize grain boundaries is the addition of nonmetallic impurities. Nonmetallic impurities often aggregate at grain boundaries and have the ability to impact the strength of materials by changing the grain boundary energy. Rupert et al. conducted first-principles simulations to study the impact of the addition of common nonmetallic impurities on Σ5 (310) grain boundary energy in Cu. They claimed that the decrease of covalent radius of the impurity and the increase of electronegativity of the impurity would lead to the increase of the grain boundary energy and further strengthen the materials. For instance, boron stabilized the grain boundaries by enhancing the charge density among the adjacent Cu atoms to improve the connection between two grain boundaries.

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mechanism and the effects of grain size in nanocrystalline graphene through a series of MD simulations. Previous studies observed inconsistent grain size dependence of the strength of graphene at the length scale of nm and the conclusions remained unclear. Therefore, Han et al. utilized MD simulation to observe the structural evolution of graphene with nanosized grains directly. The nanocrystalline graphene samples were generated with random shapes and distribution to simulate well-annealed polycrystalline samples. The samples were then loaded with uniaxial tensile stress, and the simulations were carried out at room temperature. By decreasing the grain size of graphene, Han et al. observed a transition from an inverse pseudo Hall-Petch behavior to pseudo Hall-Petch behavior and the critical grain size is 3.1 nm. Based on the arrangement and energetics of simulated particles, the inverse pseudo Hall-Petch behavior can be attributed to the creation of stress concentration sites due to the increase in the density of grain boundary junctions. Cracks then preferentially nucleate on these sites and the strength decreases. However, when the grain size is below the critical value, the stress concentration at the grain boundary junctions decreases because of stress cancellation between 5 and 7 defects. This cancellation helps graphene sustain the tensile load and exhibit a pseudo Hall-Petch behavior. This study explains the previous inconsistent experimental observations and provides an in-depth understanding of the grain boundary strengthening mechanism of nanocrystalline graphene, which cannot be easily obtained from either in-situ or ex-situ experiments.

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performance of material. Solutes tend to aggregate at dislocations and are promising for dislocation engineering. Kimura et al. conducted atom probe tomograph and observed the aggregation of niobium atoms to the dislocations. The segregation energy was calculated to be almost the same as the grain boundary segregation energy. That's to say, the interaction between niobium atoms and dislocations hindered the recovery of dislocations and thus strengthened the materials. Introducing dislocations with heterogeneous characteristics could also be utilized for material strengthening. Lu et al. introduced ordered oxygen complexes into TiZrHfNb alloy. Unlike the traditional interstitial strengthening, the introduction of the ordered oxygen complexes enhanced the strength of the alloy without the sacrifice of ductility. The mechanism was that the ordered oxygen complexes changed the dislocation motion mode from planar slip to wavy slip and promoted double cross-slip.

1154:(IPNs), consisting of interlacing crosslinked polymer networks that are not covalently bonded to one another, can lead to enhanced strength in polymer materials. The use of an IPN approach imposes compatibility (and thus macroscale homogeneity) on otherwise immiscible blends, allowing for a blending of mechanical properties. For example, silicone-polyurethane IPNs show increased tear and flexural strength over base silicone networks, while preserving the high elastic recovery of the silicone network at high strains. Increased stiffness can also be achieved by pre-straining polymer networks and then sequentially forming a secondary network within the strained material. This takes advantage of the anisotropic strain hardening of the original network (chain alignment from stretching of the polymer chains) and provides a mechanism whereby the two networks transfer stress to one another due to the imposed strain on the pre-strained network. 1063:

austenite. The steel is then quenched to a point above the martensite start temperature and held there. This allows the formation of bainite, an austenite decomposition product. While at this temperature, more C is allowed to enrich the retained austenite. This, in turn, lowers the martensite start temperature to below room temperature. Upon final quenching a metastable austenite is retained in the predominantly ferrite matrix along with small amounts of bainite (and other forms of decomposed austenite). This combination of micro-structures has the added benefits of higher strengths and resistance to necking during forming. This offers great improvements in formability over other high-strength steels. Essentially, as the TRIP steel is being formed, it becomes much stronger. Tensile strengths of TRIP steels are in the range of 600-960 MPa.

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bottom surfaces of the Ni with a solute atom (Co, Ru, or Re) embedded at the center at 300 K. Previous studies have shown that the general view of size and modulus effects cannot fully explain the solid solution strengthening caused by Re in this system due to their small values. Zhang et al. took a step further to combine the first-principle DFT calculations with MD to study the influence of stacking fault energy (SFE) on strengthening, as partial dislocations can easily form in this material structure. MD simulation results indicate that Re atoms strongly drag to edge dislocation motion and the DFT calculation reveals a dramatic increase in SFE, which is due to the interaction between host atoms and solute atoms located in the slip plane. Further, similar relations have also been found in fcc Ni embedded with Ru and Co.

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effects are caused by the interaction between dislocations and precipitates. Therefore, the characteristics of dislocation play an important role on the strengthening effects. It is known that a screw dislocation in bcc metals has very complicated features, including a non-planar core and the twinning-anti-twinning asymmetry. This complicates the strengthening mechanism analysis and modeling and it cannot be easily revealed by high resolution electron microscopy. Thus, Shim et al. simulated coherent bcc Cu precipitates with diameters ranging from 1 to 4 nm embedded in the fcc Fe matrix. A screw dislocation is then introduced and driven to glide on a {112} plane by an increasing

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velocity in the anti-twinning direction is mainly caused by a transition in the screw dislocation glide from the kink-pair to the cross-kink mechanism. In contrast, a screw dislocation overcomes the precipitates of 1–3.5 nm by shearing in the twinning direction. In addition, it also has been observed that the screw dislocation detachment mechanism with the larger, transformed precipitates involves annihilation-and-renucleation and Orowan looping in the twinning and anti-twinning direction, respectively. To fully characterize the involved mechanisms, it requires intensive transmission electron microscopy analysis and it is normally hard to give a comprehensive characterization.

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bonding depending on atomic positions, the dedicated interatomic potential is required to enable the MD simulation to yield accurate results. Therefore, interatomic potentials need to be tailored based on bonding. The following interatomic potential models are commonly used in materials science: Born-Mayer potential, Morse potential, Lennard Jones potential, and Mie potential. Although they give very similar results for the variation of potential energy with respect to the particle position, there is a non-negligible difference in their repulsive tails. These characteristics make them better describe materials systems with specific chemical bonds, respectively.

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Stiffness-confinement effects near rigid interfaces, such as those between a polymer matrix and stiffer filler materials, enhance the stiffness of composites by restricting polymer chain motion. This is especially present where fillers are chemically treated to strongly interact with polymer chains, increasing the anchoring of polymer chains to the filler interfaces and thus further restricting the motion of chains away from the interface. Stiffness-confinement effects have been characterized in model nanocomposites, and shows that composites with length scales on the order of nanometers increase the effect of the fillers on polymer stiffness dramatically.

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is grain boundary strengthening with surface energy of granular interfaces providing strength improvement. The two primary types of composite strengthening, fiber reinforcement and laminar reinforcement, fall in the 1-D and 2-D classes, respectively. The anisotropy of fiber and laminar composite strength reflects these dimensionalities. The primary idea behind composite strengthening is to combine materials with opposite strengths and weaknesses to create a material which transfers load onto the stiffer material but benefits from the ductility and toughness of the softer material.

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force exerted on a particle is caused by the negative gradient of the potential energy with respect to the particle position. Therefore, a standard procedure to conduct MD simulation is to divide the time into discrete time steps and solve the equations of motion over these intervals repeatedly to update the positions and energies of the particles. Direct observation of atomic arrangements and energetics of particles on the atomic scale makes it a powerful tool to study microstructural evolution and strengthening mechanisms.

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hierarchical nanotwinned structures pushes the hindrance effect to the extreme, due to the construction of a complex 3D nanotwinned network. Thus, the delicate design of hierarchical nanotwinned structures is of great importance for inventing materials with super strength. For instance, Yue et al. constructed a diamond composite with hierarchically nanotwinned structure by manipulating the synthesis pressure. The obtained composite showed the higher strength than typical engineering metals and ceramics.

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the length scale of the simulation to roughly a micron in size. The time steps in MD are also very small and a long simulation will only yield results at the time scale of a few nanoseconds. To further extend the scale of simulation time, it is common to apply a bias potential that changes the barrier height, therefore, accelerating the dynamics. This method is called hyperdynamics. The proper application of this method typically can extend the simulation times to microseconds.

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which contains very strong but delicate glass fibers embedded in a softer plastic matrix resilient to fracture. The latter variant is found in almost all buildings as reinforced concrete with ductile, high tensile-strength steel rods embedded in brittle, high compressive-strength concrete. In both cases, the matrix and fibers have complimentary mechanical properties and the resulting composite material is therefore more practical for applications in the real world.

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transformed into martensite, and the ferrite remains on cooling. The steel is then subjected to a temper cycle to allow some level of marten-site decomposition. By controlling the amount of martensite in the steel, as well as the degree of temper, the strength level can be controlled. Depending on processing and chemistry, the strength level can range from 350 to 960 MPa.

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interfacial energy would increase. For larger precipitate particles, looping or bowing of the dislocations would occur and result in dislocations getting longer. Hence, at a critical radius of about 5 nm, dislocations will preferably cut across the obstacle, while for a radius of 30 nm, the dislocations will readily bow or loop to overcome the obstacle.

2663: 22: 1028:. If the grain size gets too small, it becomes more difficult to fit the dislocations in the grain and the stress required to move them is less. It was not possible to produce materials with grain sizes below 10 nm until recently, so the discovery that strength decreases below a critical grain size is still finding new applications. 214:

occurs, causing the formation of a jog which opposes dislocation motion. These entanglements and jogs act as pinning points, which oppose dislocation motion. As both of these processes are more likely to occur when more dislocations are present, there is a correlation between dislocation density and shear strength.

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A similar study has been done by Zhang et al. on studying the solid solution strengthening of Co, Ru, and Re of different concentrations in fcc Ni. The edge dislocation was positioned at the center of Ni and its slip system was set to be <110> {111}. Shear stress was then applied to the top and

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Fiber-reinforced composites (FRCs) consist of a matrix of one material containing parallel embedded fibers. There are two variants of fiber-reinforced composites, one with stiff fibers and a ductile matrix and one with ductile fibers and a stiff matrix. The former variant is exemplified by fiberglass

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Many of the basic strengthening mechanisms can be classified based on their dimensionality. At 0-D there is precipitate and solid solution strengthening with particulates strengthening structure, at 1-D there is work/forest hardening with line dislocations as the hardening mechanism, and at 2-D there

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In addition to inherent errors in interatomic potentials, the number of atoms and the time steps in MD is limited by the computational power. Nowadays, it is common to simulate an MD system with multimillion atoms and it can even achieve simulations with multimillion atoms. However this still limits

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Due to the heterogeneous nature of FRCs, they also feature multiple tensile strengths (TS), one corresponding to each component. Given the assumptions outlined above, the first tensile strength would correspond to failure of the fibers, with some support from the matrix plastic deformation strength,

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Alternately, in chemical treatment, a glass slab treated containing network formers and modifiers is submerged into a molten salt bath containing ions larger than those present in the modifier. Due to a concentration gradient of the ions, mass transport must take place. As the larger cation diffuses

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of the molecular structure means that these mechanisms are heavily dependent on the direction of applied stress. While aryl rings drastically increase rigidity along the direction of the chain, these materials may still be brittle in perpendicular directions. Macroscopic structure can be adjusted to

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Transformation-hardened steels are the third type of high-strength steels. These steels use predominantly higher levels of C and Mn along with heat treatment to increase strength. The finished product will have a duplex micro-structure of ferrite with varying levels of degenerate martensite. This

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propagating a small ripple through it than by dragging the whole rug. At dislocation densities of 10 dislocations/m or higher, the strength of the material becomes high once again. Also, the dislocation density cannot be infinitely high, because then the material would lose its crystalline structure.

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because plastic deformation would require the breaking of many bonds simultaneously. However, at moderate dislocation density values of around 10-10 dislocations/m, the material will exhibit a significantly lower mechanical strength. Analogously, it is easier to move a rubber rug across a surface by

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are dislocations. Dislocations interact with each other by generating stress fields in the material. The interaction between the stress fields of dislocations can impede dislocation motion by repulsive or attractive interactions. Additionally, if two dislocations cross, dislocation line entanglement

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until it detaches from the precipitates. The shear stress that causes the detachment is regarded as the critical resolved shear stress (CRSS). Shim et al. observed that the screw dislocation velocity in the twinning direction is 2-4 times larger than that in the anti-twinning direction. The reduced

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The condition of a fiber-reinforced composite under applied tensile stress along the direction of the fibers can be decomposed into four stages from small strain to large strain. Since the stress is parallel to the fibers, the deformation is described by the isostrain condition, i.e., the fiber and

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In most binary systems, alloying above a concentration given by the phase diagram will cause the formation of a second phase. A second phase can also be created by mechanical or thermal treatments. The particles that compose the second phase precipitates act as pinning points in a similar manner to

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Increasing the dislocation density increases the yield strength which results in a higher shear stress required to move the dislocations. This process is easily observed while working a material (by a process of cold working in metals). Theoretically, the strength of a material with no dislocations

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The stress required to cause dislocation motion is orders of magnitude lower than the theoretical stress required to shift an entire plane of atoms, so this mode of stress relief is energetically favorable. Hence, the hardness and strength (both yield and tensile) critically depend on the ease with

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Previous studies on the impact of dislocation motion on materials strengthening mainly focused on high density dislocation, which is effective for enhancing strength with the cost of reducing ductility. Engineering dislocation structures and distribution is promising to comprehensively improve the

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The fact that the yield strength increases with decreasing grain size is accompanied by the caveat that the grain size cannot be decreased infinitely. As the grain size decreases, more free volume is generated resulting in lattice mismatch. Below approximately 10 nm, the grain boundaries will

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In a polycrystalline metal, grain size has a tremendous influence on the mechanical properties. Because grains usually have varying crystallographic orientations, grain boundaries arise. While undergoing deformation, slip motion will take place. Grain boundaries act as an impediment to dislocation

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This is a schematic illustrating how the lattice is strained by the addition of interstitial solute. Notice the strain in the lattice that the solute atoms cause. The interstitial solute could be carbon in iron for example. The carbon atoms in the interstitial sites of the lattice creates a stress

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method has been widely applied in materials science as it can yield information about the structure, properties, and dynamics on the atomic scale that cannot be easily resolved with experiments. The fundamental mechanism behind MD simulation is based on classical mechanics, from which we know the

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Strengthening of materials is useful in many applications. A primary application of strengthened materials is for construction. In order to have stronger buildings and bridges, one must have a strong frame that can support high tensile or compressive load and resist plastic deformation. The steel

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A schematic roughly illustrating the concept of dislocation pile up and how it effects the strength of the material. A material with larger grain size is able to have more dislocation to pile up leading to a bigger driving force for dislocations to move from one grain to another. Thus, less force

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The Hall-Petch effect illustrates that the yield strength of materials increases with decreasing grain size. However, many researchers have found that the nanocrystalline materials will soften when the grain size decreases to the critical point, which is called the inverse Hall-Petch effect. The

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Based on the mechanism of strengthening discussed in the previous contents, nowadays people are also working on enhancing the strength by purposely fabricating nanostructures in materials. Here we introduce several representative methods, including hierarchical nanotwined structures, pushing the

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based on bonding. The interatomic potentials are approximations rather than exact descriptions of interactions. The accuracy of the description varies significantly with the system and complexity of the potential form. For example, if the bonding is dynamic, which means that there is a change in

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There are also MD studies done on precipitate strengthening mechanisms. Shim et al. applied MD simulations to study the precipitate strengthening effects of nanosized body-centered-cubic (bcc) Cu on face-centered-cubic (fcc) Fe. As discussed in the previous section, the precipitate strengthening

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The dislocations in a material can interact with the precipitate atoms in one of two ways (see Figure 2). If the precipitate atoms are small, the dislocations would cut through them. As a result, new surfaces (b in Figure 2) of the particle would get exposed to the matrix and the particle-matrix

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As mentioned in the previous content, hindering dislocation motion renders great strengthening to materials. Nanoscale twins – crystalline regions related by symmetry have the ability to effectively block the dislocation motion due to the microstructure change at the interface. The formation of

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components leads to association of hard domains within a sea of soft phase, yielding a physical structure with increased strength and rigidity. If yielding occurs by chains sliding past each other (shear bands), the strength can also be increased by introducing kinks into the polymer chains via

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TRIP steels also use C and Mn, along with heat treatment, in order to retain small amounts of austenite and bainite in a ferrite matrix. Thermal processing for TRIP steels again involves annealing the steel in the a + g region for a period of time sufficient to allow C and Mn to diffuse into

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interactions with other dislocations and solute particles, creating physical barriers from second phase precipitates forming along grain boundaries. There are five main strengthening mechanisms for metals, each is a method to prevent dislocation motion and propagation, or make it energetically

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There have been extensive studies on different strengthening mechanisms using MD simulation. These studies reveal the microstructural evolution that cannot be either easily observed from an experiment or predicted by a simplified model. Han et al. investigated the grain boundary strengthening

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In tempered glasses, air jets are used to rapidly cool the top and bottom surfaces of a softened (hot) slab of glass. Since the surface cools quicker, there is more free volume at the surface than in the bulk melt. The core of the slab then pulls the surface inward, resulting in an internal

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The stress required to move a dislocation from one grain to another in order to plastically deform a material depends on the grain size. The average number of dislocations per grain decreases with average grain size (see Figure 3). A lower number of dislocations per grain results in a lower

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The annealing process for dual -phase steels consists of first holding the steel in the alpha + gamma temperature region for a set period of time. During that time C and Mn diffuse into the austenite leaving a ferrite of greater purity. The steel is then quenched so that the austenite is

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Dispersion strengthening is a type of particulate strengthening in which incoherent precipitates attract and pin dislocations. These particles are typically larger than those in the Orowon precipitation hardening discussed above. The effect of dispersion strengthening is effective at high

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In general, the solid solution strengthening depends on the concentration of the solute atoms, shear modulus of the solute atoms, size of solute atoms, valency of solute atoms (for ionic materials), and the symmetry of the solute stress field. The magnitude of strengthening is higher for

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Many silicate glasses are strong in compression but weak in tension. By introducing compression stress into the structure, the tensile strength of the material can be increased. This is typically done via two mechanisms: thermal treatment (tempering) or chemical bath (via ion exchange).

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such as fibers, platelets, and particles is a commonly employed technique for strengthening polymer materials. Fillers such as clay, silica, and carbon network materials have been extensively researched and used in polymer composites in part due to their effect on mechanical properties.

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Martensitic steels are also high in C and Mn. These are fully quenched to martensite during processing. The martensite structure is then tempered back to the appropriate strength level, adding toughness to the steel. Tensile strengths for these steels range as high as 1500 MPa.

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Increasing the concentration of the solute atoms will increase the yield strength of a material, but there is a limit to the amount of solute that can be added, and one should look at the phase diagram for the material and the alloy to make sure that a second phase is not created.

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frame used to make the building should be as strong as possible so that it does not bend under the entire weight of the building. Polymeric roofing materials would also need to be strong so that the roof does not cave in when there is build-up of snow on the rooftop.

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cross links give rise to a hard structure which can withstand very high temperatures. These cross-links are particularly helpful in improving tensile strength of materials which contain much free volume prone to crazing, typically glassy brittle polymers. In

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from the molten salt into the surface, it replaces the smaller ion from the modifier. The larger ion squeezing into surface introduces compressive stress in the glass's surface. A common example is treatment of sodium oxide modified silicate glass in molten

155:), we simply need to introduce a mechanism which prohibits the mobility of these dislocations. Whatever the mechanism may be, (work hardening, grain size reduction, etc.) they all hinder dislocation motion and render the material stronger than previously. 3008:

Krutyeva, M.; Wischnewski, A.; Monkenbusch, M.; Willner, L.; Maiz, J.; Mijangos, C.; Arbe, A.; Colmenero, J.; Radulescu, A.; Holderer, O.; Ohl, M.; Richter, D. (2013). "Effect of Nanoconfinement on Polymer Dynamics: Surface Layers and Interphases".

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move and multiply so as to result in macroscopic deformation. In other words, it is the movement of dislocations in the material which allows for deformation. If we want to enhance a material's mechanical properties (i.e. increase the yield and

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As a result of the aforementioned dimensionality (1-D) of fiber reinforcement, significant anisotropy is observed in its mechanical properties. The following equations model the tensile strength of a FRC as a function of the misalignment angle

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The angle is close to 90 so most of the load remains in the matrix and thus tensile transverse matrix fracture is the dominant failure condition. This can be seen as complementary to the small angle case, with similar form but with an angle

1945: 127:, has superior mechanical properties compared to its constituent metals due to solution strengthening. Work hardening (such as beating a red-hot piece of metal on anvil) has also been used for centuries by blacksmiths to introduce 683:

non-symmetric stress fields because these solutes can interact with both edge and screw dislocations, whereas symmetric stress fields, which cause only volume change and not shape change, can only interact with edge dislocations.

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arises from a stacked multilayer macrostructure where aromatic polymer layers are rotated with respect to their neighbors. When loaded oblique to the chain direction, ductile polymers with flexible linkages, such as oriented

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materials. These strengthening mechanisms give engineers the ability to tailor the mechanical properties of materials to suit a variety of different applications. For example, the favorable properties of steel result from

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These studies show great examples of how the MD method can assist the studies of strengthening mechanisms and provides more insights on the atomic scale. However, it is important to note the limitations of the method.

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temperatures whereas precipitation strengthening from heat treatments are typically limited to temperatures much lower than the melting temperature of the material. One common type of dispersion strengthening is

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of the material. Solute atoms have stress fields around them which can interact with those of dislocations. The presence of solute atoms impart compressive or tensile stresses to the lattice, depending on solute

163:, or locations in the crystal that oppose the motion of dislocations, can be introduced into the lattice to reduce dislocation mobility, thereby increasing mechanical strength. Dislocations may be pinned due to 2126: 2017: 273: 942: 693:

A schematic illustrating how the dislocations can interact with a particle. It can either cut through the particle or bow around the particle and create a dislocation loop as it moves over the particle.

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compressive stress at the surface. This substantially increases the tensile strength of the material as tensile stresses exerted on the glass must now resolve the compressive stresses before yielding.

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The strength of materials cannot infinitely increase. Each of the mechanisms explained below involves some trade-off by which other material properties are compromised in the process of strengthening.

631: 422: 1148:(APS). For example, by forming a 50/50 mixture of APS with polyphenylene oxide (PPO), this embrittling tendency can be almost completely suppressed, substantially increasing the fracture strength. 1055:

allows for varying levels of strength. There are three basic types of transformation-hardened steels. These are dual-phase (DP), transformation-induced plasticity (TRIP), and martensitic steels.

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formation. In these systems, strengthening mechanisms do not involve dislocations, but rather consist of modifications to the chemical structure and processing of the constituent material.

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the misaligned stress samples a slightly larger cross-sectional area of the fiber so the strength of the fiber is not just maintained but actually increases compared to the parallel case.

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The fiber fractures while the matrix continues to plastically deform. While in reality the fractured pieces of fiber still contribute some strength, it is left out of this simple model.

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Huang, Zhifeng, et al. "Uncovering the influence of common nonmetallic impurities on the stability and strength of a Σ5 (310) grain boundary in Cu." Acta Materialia 148 (2018): 110-122.

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Research is also currently being done to increase the strength of metallic materials through the addition of polymer materials such as bonded carbon fiber reinforced polymer to (CFRP)

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Both fiber and composite remain in the elastic strain regime. In this stage, we also note that the composite Young's modulus is a simple weighted sum of the two component moduli.

2185: 3097:(2017). "Stiffness Gradients in Glassy Polymer Model Nanocomposites: Comparisons of Quantitative Characterization by Fluorescence Spectroscopy and Atomic Force Microscopy". 370: 1484: 1018: 1457: 1417: 1377: 2573: 2340: 1090:

consisting of chains which easily slide past each other, chemical and physical cross linking can be used to increase rigidity and yield strength. In thermoset polymers (

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Ligon-Auer, Samuel Clark; Schwentenwein, Martin; Gorsche, Christian; Stampfl, Jürgen; Liska, Robert (2016). "Toughening of photo-curable polymer networks: A review".

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materials such as polymers, amorphous ceramics (glass), and amorphous metals, the lack of long range order leads to yielding via mechanisms such as brittle fracture,

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For a composite containing aligned, stiff fibers which span the length of the material and a soft, ductile matrix, the following descriptions provide a rough model.

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This is a schematic illustrating how the lattice is strained by the addition of substitutional solute. Notice the strain in the lattice that the solute atom causes.

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This relationship does not apply when dislocations form cell structures. When cell structures are formed, the average cell size controls the strengthening effect.

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unfavorable for the dislocation to move. For a material that has been strengthened, by some processing method, the amount of force required to start irreversible

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dislocation 'pressure' building up at grain boundaries. This makes it more difficult for dislocations to move into adjacent grains. This relationship is the

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For this strengthening mechanism, solute atoms of one element are added to another, resulting in either substitutional or interstitial point defects in the

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Green, D., An Introduction to the Mechanical Properties of Ceramics, Cambridge Solid State Science Series, Eds. Clarke, D.R., Suresh, S., Ward, I.M. (1998)

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Carlton, C. E., and P. J. Ferreira. "What is behind the inverse Hall–Petch effect in nanocrystalline materials?." Acta Materialia 55.11 (2007): 3749-3756.

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need be applied to move a dislocation from a larger, than from a smaller grain, leading materials with smaller grains to exhibit higher yield stress.

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Liu, X. C., H. W. Zhang, and K. Lu. "Strain-induced ultrahard and ultrastable nanolaminated structure in nickel." Science 342.6156 (2013): 337-340.

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Mixing polymers is another method of increasing strength, particularly with materials that show crazing preceding brittle fracture such as atactic

1141:, are highly prone to shear band formation, so macroscopic structures which place the load parallel to the draw direction would increase strength. 2456: 1840:

Both fiber and composite yield and plastically deform. This stage often features significant Poisson strain which is not captured by model below.

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via breaking of inter- and intra molecular bonds; hence, the chemical structure of these materials plays a huge role in increasing strength. For

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Lei, Zhifeng, et al. "Enhanced strength and ductility in a high-entropy alloy via ordered oxygen complexes." Nature 563.7732 (2018): 546-550.

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Singh, Naveen K.; Lesser, Alan J. (2010). "Mechanical and thermo-mechanical studies of double networks based on thermoplastic elastomers".

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The angle is large enough that the load is not effectively transferred to the fibers and the matrix experiences enough strain to fracture.

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Rountree, Cindy (2002). "Atomistic Aspects of Crack Propagation in Brittle Materials: Multimillion Atom Molecular Dynamics Simulations".

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Han, Jihoon (2020). "The transition from an inverse pseudo Hall-Petch to a pseudo Hall-Petch behavior in nanocrystalline graphene".

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Takahashi, Jun, et al. "Direct observation of niobium segregation to dislocations in steel." Acta Materialia 107 (2016): 415-422.

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Yue, Yonghai, et al. "Hierarchically structured diamond composite with exceptional toughness." Nature 582.7812 (2020): 370-374.

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Kuhlmann-Wilsdorf, D., "Theory of Plastic Deformation," Materials Science and Engineering A, vol 113, pp 1-42, July 1989

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High-strength steels generally fall into three basic categories, classified by the strengthening mechanism employed. 1-

871: 855: 553: 37: 2830: 703: 2265: 562:(see Figure on the right). The solute atoms cause lattice distortions that impede dislocation motion, increasing the 494: 3589: 1334: 722: 1661: 2900:

Callister, William Jr, Materials Science and Engineering, An Introduction. John Wiley & Sons, NY, NY (1985)

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Zhang, Xingming (2013). "Atomistic simulations of solid solution strengthening in Ni-based superalloy".

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To obtain accurate MD simulation results, it is essential to build a model that properly describes the

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The angle is small enough to maintain load transfer onto the fibers and prevent delamination of fibers

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Arkles, Barry; Crosby, Jane (1989). "Polysiloxane—Thermoplastic Interpenetrating Polymer Networks".

348: 32: 1462: 990: 571:, which interfere with nearby dislocations, causing the solute atoms to act as potential barriers. 100: 3398: 3288: 2723: 1422: 1382: 1355: 1289: 1112: 2552: 2315: 2219: 2216:) between the fibers and the applied force, the stresses in the parallel and perpendicular, or 658: 3559: 3421: 3243: 3147: 3090: 3044: 2970: 2960: 2937: 2927: 864:

1. Dislocation must change its direction of motion due to the differing orientation of grains.

2877:

Lawn, B.R., Fracture of Brittle Solids, Cambridge Solid State Science Series, 2nd Edn. (1993)

2199: 280: 3485: 3468:

Voter, Arthur (1997). "Hyperdynamics: Accelerated Molecular Dynamics of Infrequent Events".

3454: 3450: 3390: 3368:"Experimental and theoretical study of lattice relaxation around refractory atoms in nickel" 3348: 3319: 3280: 3184: 3139: 3114: 3071: 3034: 3026: 2868:

Davidge, R.W., Mechanical Behavior of Ceramics, Cambridge Solid State Science Series, (1979)

152: 1940:{\displaystyle \sigma _{c}=V_{f}\sigma _{f}(\epsilon _{c})+V_{m}\sigma _{m}(\epsilon _{c})} 3367: 3481: 3386: 3276: 3180: 3110: 3022: 2676:

Please expand the article to include this information. Further details may exist on the

2245: 2850: 1735:

The fiber remains in the elastic regime but the matrix yields and plastically deforms.

970: 950: 686: 638: 342: 324: 300: 210: 204: 160: 132: 79: 539: 3578: 3308:"Strengthening of Nanosized bcc Cu Precipitate in bcc Fe: A Molecular Dynamics Study" 3292: 1297: 318: 3570:

An open source Matlab toolbox for analysis of slip transfer through grain boundaries

3402: 3352: 426:

Similarly, the axial strengthening will be proportional to the dislocation density.

3030: 2746: 1829:{\displaystyle \sigma _{c}=V_{f}\epsilon _{c}E_{f}+V_{m}\sigma _{m}(\epsilon _{c})} 1301: 1138: 563: 530: 164: 128: 3394: 824: 217:

The shear strengthening provided by dislocation interactions can be described by:

3284: 3118: 3489: 3324: 3307: 1309: 1145: 147: 91: 3143: 375:

Dislocation density is defined as the dislocation line length per unit volume:

1486:), and the stress of the fiber and matrix as read from a stress-strain curve ( 1129: 1124: 184: 2941: 1123:

unit via incorporation of aryl rings is another strengthening mechanism. The

2974: 2530:{\displaystyle TS(\theta )={\frac {\tau _{my}}{\sin(\theta )\cos(\theta )}}} 1313: 176: 95: 87: 83: 3048: 2662: 1650:{\displaystyle \sigma _{c}=V_{f}\epsilon _{c}E_{f}+V_{m}\epsilon _{c}E_{m}} 2643:{\displaystyle TS(\theta )={\frac {\sigma _{\perp }}{\sin ^{2}(\theta )}}} 1305: 1095: 1087: 1083: 1080: 3039: 1352:

matrix experience the same strain. At each stage, the composite stress (

1278:{\displaystyle \sigma _{y=modified}=\sigma _{y,0}+\sigma _{compressive}} 3564: 3188: 3075: 1120: 1104: 559: 180: 3569: 2433:{\displaystyle TS(\theta )={\frac {\sigma _{||}}{\cos ^{2}(\theta )}}} 476:{\displaystyle \Delta \sigma _{y}\propto {Gb{\sqrt {\rho _{\perp }}}}} 1551:{\displaystyle \sigma _{f}(\epsilon _{c}),\sigma _{m}(\epsilon _{c})} 1379:) is given in terms of the volume fractions of the fiber and matrix ( 1133: 120: 104: 3133: 2789:

limit of grain size for strengthening and dislocation engineering.

2121:{\displaystyle TS_{1}=V_{f}TS_{f}+V_{m}\sigma _{m}(\epsilon _{c})} 2012:{\displaystyle \sigma _{c}\approx V_{m}\sigma _{m}(\epsilon _{c})} 268:{\displaystyle \Delta \tau _{d}=\alpha Gb{\sqrt {\rho _{\perp }}}} 116: 112: 574:

The shear stress required to move dislocations in a material is:

3560:

Grain boundary strengthening in alumina by rare earth impurities

709:

solutes, though the particles are not necessarily single atoms.

124: 108: 2656: 15: 866:

2. Discontinuity of slip planes from grain one to grain two.

2922:

Soboyejo, Wole O. (2003). "8.4 Dislocation Strengthening".

2542:

Near Perpendicular Misalignment Angle (transverse fracture)

937:{\displaystyle \sigma _{y}=\sigma _{y,0}+{k \over {d^{x}}}} 3138:. Advances in Chemistry. Vol. 224. pp. 181–199. 2955:

Soboyejo, Wole O. (2003). "8.7 Dispersion Strengthening".

626:{\displaystyle \Delta \tau =Gb{\sqrt {c}}\epsilon ^{3/2}} 417:{\displaystyle \rho _{\perp }={\frac {\ell }{\ell ^{3}}}} 2763:

Limitation of the MD studies of strengthening mechanisms

2583: 2555: 2459: 2366: 2318: 2268: 2248: 2222: 2202: 2137: 2039: 1959: 1848: 1743: 1664: 1570: 1492: 1465: 1425: 1385: 1358: 1175: 993: 973: 953: 882: 779: 725: 661: 641: 582: 497: 434: 383: 351: 327: 303: 283: 225: 2784:

Nanostructure fabrication for material strengthening

815:{\displaystyle \Delta \tau ={\gamma \pi r \over bL}} 675:

is the strain on the material caused by the solute.

3565:

Mechanism of grain boundary strengthening of steels

3227:(2nd ed.). Long Grove, IL: Waveland Press Inc. 3169:Journal of Polymer Science Part B: Polymer Physics 2642: 2567: 2529: 2432: 2334: 2304: 2254: 2234: 2208: 2179: 2120: 2011: 1939: 1828: 1723: 1649: 1550: 1478: 1451: 1411: 1371: 1277: 1041:solid-solution-strengthened steels (rephos steels) 1012: 979: 959: 936: 814: 763: 667: 647: 625: 516: 475: 416: 364: 333: 309: 289: 267: 172:is greater than it was for the original material. 3240:Molecular Dynamics Simulation: Elementary Methods 2802:Pushing the limit of grain size for strengthening 2348:Small Misalignment Angle (longitudinal fracture) 874:and can be mathematically described as follows: 3418:Introduction to Computational Materials Science 2305:{\displaystyle \ \sigma _{||},\sigma _{\perp }} 1419:), the Young's moduli of the fiber and matrix ( 1071:Strengthening mechanisms in amorphous materials 3420:. Cambridge University Press. pp. 82–89. 3242:. John Wiley & Sons, Inc. pp. 38–42. 2718:Molecular dynamics simulation assisted studies 2445:Significant Misalignment Angle (shear failure) 716:The mathematical descriptions are as follows: 517:{\displaystyle \sigma \approx {\frac {G}{10}}} 2957:Mechanical properties of engineered materials 2924:Mechanical properties of engineered materials 1036:This method of hardening is used for steels. 1024:tend to slide instead; a phenomenon known as 8: 3218: 2998:Cambridge University Press. pg 420-425. 1999 2896: 2894: 2892: 764:{\displaystyle \Delta \tau ={Gb \over L-2r}} 3216: 3214: 3212: 3210: 3208: 3206: 3204: 3202: 3200: 3198: 2030:and the second with failure of the matrix. 1724:{\displaystyle E_{c}=V_{f}E_{f}+V_{m}E_{m}} 3323: 3038: 2754:Solid solution strengthening and alloying 2619: 2608: 2602: 2582: 2554: 2484: 2478: 2458: 2409: 2397: 2392: 2391: 2385: 2365: 2323: 2317: 2312:), and the shear strength of the matrix ( 2296: 2282: 2277: 2276: 2267: 2247: 2221: 2201: 2171: 2158: 2145: 2136: 2109: 2096: 2086: 2073: 2060: 2047: 2038: 2000: 1987: 1977: 1964: 1958: 1928: 1915: 1905: 1889: 1876: 1866: 1853: 1847: 1817: 1804: 1794: 1781: 1771: 1761: 1748: 1742: 1715: 1705: 1692: 1682: 1669: 1663: 1641: 1631: 1621: 1608: 1598: 1588: 1575: 1569: 1539: 1526: 1510: 1497: 1491: 1470: 1464: 1443: 1430: 1424: 1403: 1390: 1384: 1363: 1357: 1239: 1220: 1180: 1174: 998: 992: 972: 952: 925: 920: 915: 900: 887: 881: 789: 778: 735: 724: 660: 640: 613: 609: 598: 581: 548:Solid solution strengthening and alloying 504: 496: 464: 458: 451: 442: 433: 406: 397: 388: 382: 356: 350: 326: 302: 282: 257: 251: 233: 224: 66:Learn how and when to remove this message 2990: 2988: 2986: 2984: 823: 685: 538: 535:field that impedes dislocation movement. 529: 78:Methods have been devised to modify the 3455:10.1146/annurev.matsci.32.111201.142017 2861: 861:motion for the following two reasons: 3585:Strengthening mechanisms of materials 1049:high strength low alloy steels (HSLA) 7: 2917: 2915: 1132:. For example, the high strength of 209:The primary species responsible for 3443:Annual Review of Materials Research 2793:Hierarchical nanotwinned structures 2180:{\displaystyle TS_{2}=V_{m}TS_{m}} 1051:3- transformation-hardened steels 987:is the average grain diameter and 780: 726: 583: 435: 226: 194:Strengthening mechanisms in metals 14: 2996:Mechanical Behavior of Materials. 1152:Interpenetrating polymer networks 1108:unsaturated carbon-carbon bonds. 1103:, phase separation of dissimilar 131:into materials, increasing their 3225:Mechanical Behavior of Materials 2661: 2191:Anisotropy (Orientation effects) 1459:), the strain of the composite ( 1119:Increasing the bulkiness of the 655:is the solute concentration and 46:has been specified. Please help 20: 3353:10.1016/j.commatsci.2012.10.002 3341:Computational Materials Science 1094:), disulfide bridges and other 297:is a proportionality constant, 3031:10.1103/PhysRevLett.110.108303 2634: 2628: 2596: 2590: 2521: 2515: 2506: 2500: 2472: 2466: 2424: 2418: 2398: 2393: 2379: 2373: 2283: 2278: 2115: 2102: 2006: 1993: 1934: 1921: 1895: 1882: 1823: 1810: 1545: 1532: 1516: 1503: 1300:developed and manufactured by 1020:is the original yield stress. 844:oxide dispersion strengthening 365:{\displaystyle \rho _{\perp }} 1: 3395:10.1016/j.actamat.2008.05.015 3135:Silicon-Based Polymer Science 1479:{\displaystyle \epsilon _{c}} 1294:chemically strengthened glass 1013:{\displaystyle \sigma _{y,0}} 146:occurs when large numbers of 3285:10.1016/j.carbon.2020.01.107 3119:10.1021/acs.macromol.7b00917 2836:Solid solution strengthening 2826:Grain boundary strengthening 2731:Grain boundary strengthening 2674:about laminar reinforcement. 856:Grain boundary strengthening 850:Grain boundary strengthening 554:Solid solution strengthening 372:is the dislocation density. 3490:10.1103/PhysRevLett.78.3908 3325:10.2320/matertrans.M2009040 3223:Courtney, Thomas H (1990). 3089:Zhang, Min; Askar, Shadid; 2831:Precipitation strengthening 1452:{\displaystyle E_{f},E_{m}} 1412:{\displaystyle V_{f},V_{m}} 1372:{\displaystyle \sigma _{c}} 704:Precipitation strengthening 3606: 3144:10.1021/ba-1990-0224.ch010 2568:{\displaystyle 90-\theta } 2335:{\displaystyle \tau _{my}} 1347:Four stages of deformation 1335:Fiber-reinforced composite 1332: 853: 701: 551: 202: 36:to meet Knowledge (XXG)'s 2740:Precipitate strengthening 2235:{\displaystyle \theta =0} 668:{\displaystyle \epsilon } 159:which dislocations move. 3306:Shim, Jae-Hyeok (2009). 1032:Transformation hardening 837:Dispersion strengthening 3416:Lesar, Richard (2013). 3011:Physical Review Letters 2811:Dislocation engineering 2724:molecular dynamics (MD) 2209:{\displaystyle \theta } 1320:Composite strengthening 1101:thermoplastic elastomer 872:Hall-Petch relationship 773:For particle cutting- 719:For particle bowing- 698:Precipitation hardening 489:will be extremely high 290:{\displaystyle \alpha } 3312:Materials Transactions 2846:Tempering (metallurgy) 2672:is missing information 2644: 2569: 2531: 2434: 2336: 2306: 2256: 2236: 2210: 2181: 2122: 2013: 1941: 1830: 1725: 1651: 1552: 1480: 1453: 1413: 1373: 1279: 1026:grain-boundary sliding 1014: 981: 961: 938: 833: 816: 765: 694: 669: 649: 627: 544: 536: 518: 477: 418: 366: 335: 311: 291: 269: 3095:Brinson, L. Catherine 2841:Strength of materials 2773:interatomic potential 2653:Laminar reinforcement 2645: 2570: 2532: 2435: 2337: 2307: 2257: 2237: 2211: 2182: 2123: 2014: 1942: 1831: 1726: 1652: 1553: 1481: 1454: 1414: 1374: 1280: 1092:thermosetting plastic 1015: 982: 962: 939: 827: 817: 766: 689: 670: 650: 628: 542: 533: 519: 478: 419: 367: 336: 312: 292: 270: 170:(plastic) deformation 3366:Koteski, V. (2008). 3238:Haile, J.M. (1997). 2581: 2553: 2457: 2364: 2316: 2266: 2246: 2220: 2200: 2135: 2037: 1957: 1846: 1741: 1662: 1568: 1490: 1463: 1423: 1383: 1356: 1173: 1128:compensate for this 1045:grain-refined steels 991: 971: 951: 880: 777: 723: 659: 639: 580: 495: 432: 381: 349: 325: 301: 281: 223: 48:improve this article 3482:1997PhRvL..78.3908V 3387:2008AcMat..56.4601K 3277:2020Carbo.161..542H 3181:2010JPoSB..48..778S 3111:2017MaMol..50.5447Z 3023:2013PhRvL.110j8303K 1329:Fiber reinforcement 144:Plastic deformation 3189:10.1002/polb.21943 3091:Torkelson, John M. 3076:10.1039/C5PY01631B 2640: 2565: 2527: 2430: 2332: 2302: 2255:{\displaystyle 90} 2252: 2232: 2206: 2177: 2118: 2009: 1937: 1826: 1721: 1647: 1548: 1476: 1449: 1409: 1369: 1290:potassium chloride 1275: 1010: 977: 957: 934: 834: 812: 761: 695: 665: 645: 623: 545: 537: 514: 473: 414: 362: 331: 307: 287: 265: 3590:Materials science 3427:978-0-521-84587-8 3381:(17): 4601–4607. 3249:978-0-471-18439-3 3105:(14): 5447–5458. 3064:Polymer Chemistry 2959:. Marcel Dekker. 2926:. Marcel Dekker. 2695: 2694: 2638: 2525: 2428: 2271: 980:{\displaystyle d} 960:{\displaystyle k} 932: 810: 759: 648:{\displaystyle c} 603: 512: 470: 412: 334:{\displaystyle b} 310:{\displaystyle G} 263: 139:Basic description 103:incorporation of 76: 75: 68: 38:quality standards 29:This article may 3597: 3548: 3545: 3539: 3536: 3530: 3527: 3521: 3518: 3512: 3509: 3503: 3500: 3494: 3493: 3465: 3459: 3458: 3438: 3432: 3431: 3413: 3407: 3406: 3372: 3363: 3357: 3356: 3336: 3330: 3329: 3327: 3318:(9): 2229–2234. 3303: 3297: 3296: 3260: 3254: 3253: 3235: 3229: 3228: 3220: 3193: 3192: 3164: 3158: 3157: 3129: 3123: 3122: 3086: 3080: 3079: 3059: 3053: 3052: 3042: 3005: 2999: 2994:Meyers, Chawla. 2992: 2979: 2978: 2952: 2946: 2945: 2919: 2910: 2907: 2901: 2898: 2887: 2884: 2878: 2875: 2869: 2866: 2713:Current research 2690: 2687: 2681: 2665: 2657: 2649: 2647: 2646: 2641: 2639: 2637: 2624: 2623: 2613: 2612: 2603: 2574: 2572: 2571: 2566: 2536: 2534: 2533: 2528: 2526: 2524: 2492: 2491: 2479: 2439: 2437: 2436: 2431: 2429: 2427: 2414: 2413: 2403: 2402: 2401: 2396: 2386: 2341: 2339: 2338: 2333: 2331: 2330: 2311: 2309: 2308: 2303: 2301: 2300: 2288: 2287: 2286: 2281: 2269: 2261: 2259: 2258: 2253: 2241: 2239: 2238: 2233: 2215: 2213: 2212: 2207: 2186: 2184: 2183: 2178: 2176: 2175: 2163: 2162: 2150: 2149: 2127: 2125: 2124: 2119: 2114: 2113: 2101: 2100: 2091: 2090: 2078: 2077: 2065: 2064: 2052: 2051: 2025:Tensile strength 2018: 2016: 2015: 2010: 2005: 2004: 1992: 1991: 1982: 1981: 1969: 1968: 1946: 1944: 1943: 1938: 1933: 1932: 1920: 1919: 1910: 1909: 1894: 1893: 1881: 1880: 1871: 1870: 1858: 1857: 1835: 1833: 1832: 1827: 1822: 1821: 1809: 1808: 1799: 1798: 1786: 1785: 1776: 1775: 1766: 1765: 1753: 1752: 1730: 1728: 1727: 1722: 1720: 1719: 1710: 1709: 1697: 1696: 1687: 1686: 1674: 1673: 1656: 1654: 1653: 1648: 1646: 1645: 1636: 1635: 1626: 1625: 1613: 1612: 1603: 1602: 1593: 1592: 1580: 1579: 1557: 1555: 1554: 1549: 1544: 1543: 1531: 1530: 1515: 1514: 1502: 1501: 1485: 1483: 1482: 1477: 1475: 1474: 1458: 1456: 1455: 1450: 1448: 1447: 1435: 1434: 1418: 1416: 1415: 1410: 1408: 1407: 1395: 1394: 1378: 1376: 1375: 1370: 1368: 1367: 1284: 1282: 1281: 1276: 1274: 1273: 1231: 1230: 1212: 1211: 1113:filler materials 1019: 1017: 1016: 1011: 1009: 1008: 986: 984: 983: 978: 966: 964: 963: 958: 943: 941: 940: 935: 933: 931: 930: 929: 916: 911: 910: 892: 891: 821: 819: 818: 813: 811: 809: 801: 790: 770: 768: 767: 762: 760: 758: 744: 736: 674: 672: 671: 666: 654: 652: 651: 646: 632: 630: 629: 624: 622: 621: 617: 604: 599: 523: 521: 520: 515: 513: 505: 482: 480: 479: 474: 472: 471: 469: 468: 459: 447: 446: 423: 421: 420: 415: 413: 411: 410: 398: 393: 392: 371: 369: 368: 363: 361: 360: 340: 338: 337: 332: 316: 314: 313: 308: 296: 294: 293: 288: 274: 272: 271: 266: 264: 262: 261: 252: 238: 237: 153:tensile strength 71: 64: 60: 57: 51: 24: 23: 16: 3605: 3604: 3600: 3599: 3598: 3596: 3595: 3594: 3575: 3574: 3556: 3551: 3546: 3542: 3537: 3533: 3528: 3524: 3519: 3515: 3510: 3506: 3501: 3497: 3470:Phys. Rev. Lett 3467: 3466: 3462: 3440: 3439: 3435: 3428: 3415: 3414: 3410: 3375:Acta Materialia 3370: 3365: 3364: 3360: 3338: 3337: 3333: 3305: 3304: 3300: 3262: 3261: 3257: 3250: 3237: 3236: 3232: 3222: 3221: 3196: 3166: 3165: 3161: 3154: 3131: 3130: 3126: 3088: 3087: 3083: 3061: 3060: 3056: 3007: 3006: 3002: 2993: 2982: 2967: 2954: 2953: 2949: 2934: 2921: 2920: 2913: 2908: 2904: 2899: 2890: 2885: 2881: 2876: 2872: 2867: 2863: 2859: 2822: 2813: 2804: 2795: 2786: 2765: 2756: 2742: 2733: 2720: 2715: 2700: 2691: 2685: 2682: 2675: 2666: 2655: 2615: 2614: 2604: 2579: 2578: 2551: 2550: 2493: 2480: 2455: 2454: 2405: 2404: 2387: 2362: 2361: 2319: 2314: 2313: 2292: 2272: 2264: 2263: 2244: 2243: 2218: 2217: 2198: 2197: 2193: 2167: 2154: 2141: 2133: 2132: 2105: 2092: 2082: 2069: 2056: 2043: 2035: 2034: 2027: 1996: 1983: 1973: 1960: 1955: 1954: 1924: 1911: 1901: 1885: 1872: 1862: 1849: 1844: 1843: 1813: 1800: 1790: 1777: 1767: 1757: 1744: 1739: 1738: 1711: 1701: 1688: 1678: 1665: 1660: 1659: 1637: 1627: 1617: 1604: 1594: 1584: 1571: 1566: 1565: 1535: 1522: 1506: 1493: 1488: 1487: 1466: 1461: 1460: 1439: 1426: 1421: 1420: 1399: 1386: 1381: 1380: 1359: 1354: 1353: 1349: 1337: 1331: 1322: 1292:. Examples of 1235: 1216: 1176: 1171: 1170: 1160: 1078: 1073: 1034: 994: 989: 988: 969: 968: 967:is a constant, 949: 948: 921: 896: 883: 878: 877: 865: 858: 852: 839: 802: 791: 775: 774: 745: 737: 721: 720: 706: 700: 657: 656: 637: 636: 605: 578: 577: 556: 550: 493: 492: 460: 438: 430: 429: 402: 384: 379: 378: 352: 347: 346: 323: 322: 299: 298: 279: 278: 253: 229: 221: 220: 207: 201: 196: 141: 133:yield strengths 72: 61: 55: 52: 41: 25: 21: 12: 11: 5: 3603: 3601: 3593: 3592: 3587: 3577: 3576: 3573: 3572: 3567: 3562: 3555: 3554:External links 3552: 3550: 3549: 3540: 3531: 3522: 3513: 3504: 3495: 3460: 3433: 3426: 3408: 3358: 3331: 3298: 3255: 3248: 3230: 3194: 3175:(7): 778–789. 3159: 3152: 3124: 3099:Macromolecules 3081: 3070:(2): 257–286. 3054: 3017:(10): 108303. 3000: 2980: 2965: 2947: 2932: 2911: 2902: 2888: 2879: 2870: 2860: 2858: 2855: 2854: 2853: 2851:Work hardening 2848: 2843: 2838: 2833: 2828: 2821: 2818: 2812: 2809: 2803: 2800: 2794: 2791: 2785: 2782: 2764: 2761: 2755: 2752: 2741: 2738: 2732: 2729: 2719: 2716: 2714: 2711: 2699: 2696: 2693: 2692: 2669: 2667: 2660: 2654: 2651: 2650: 2636: 2633: 2630: 2627: 2622: 2618: 2611: 2607: 2601: 2598: 2595: 2592: 2589: 2586: 2576: 2564: 2561: 2558: 2546: 2545: 2544: 2543: 2537: 2523: 2520: 2517: 2514: 2511: 2508: 2505: 2502: 2499: 2496: 2490: 2487: 2483: 2477: 2474: 2471: 2468: 2465: 2462: 2452: 2449: 2448: 2447: 2446: 2440: 2426: 2423: 2420: 2417: 2412: 2408: 2400: 2395: 2390: 2384: 2381: 2378: 2375: 2372: 2369: 2359: 2352: 2351: 2350: 2349: 2329: 2326: 2322: 2299: 2295: 2291: 2285: 2280: 2275: 2251: 2231: 2228: 2225: 2205: 2192: 2189: 2188: 2187: 2174: 2170: 2166: 2161: 2157: 2153: 2148: 2144: 2140: 2129: 2128: 2117: 2112: 2108: 2104: 2099: 2095: 2089: 2085: 2081: 2076: 2072: 2068: 2063: 2059: 2055: 2050: 2046: 2042: 2026: 2023: 2022: 2021: 2020: 2019: 2008: 2003: 1999: 1995: 1990: 1986: 1980: 1976: 1972: 1967: 1963: 1949: 1948: 1947: 1936: 1931: 1927: 1923: 1918: 1914: 1908: 1904: 1900: 1897: 1892: 1888: 1884: 1879: 1875: 1869: 1865: 1861: 1856: 1852: 1838: 1837: 1836: 1825: 1820: 1816: 1812: 1807: 1803: 1797: 1793: 1789: 1784: 1780: 1774: 1770: 1764: 1760: 1756: 1751: 1747: 1733: 1732: 1731: 1718: 1714: 1708: 1704: 1700: 1695: 1691: 1685: 1681: 1677: 1672: 1668: 1657: 1644: 1640: 1634: 1630: 1624: 1620: 1616: 1611: 1607: 1601: 1597: 1591: 1587: 1583: 1578: 1574: 1547: 1542: 1538: 1534: 1529: 1525: 1521: 1518: 1513: 1509: 1505: 1500: 1496: 1473: 1469: 1446: 1442: 1438: 1433: 1429: 1406: 1402: 1398: 1393: 1389: 1366: 1362: 1348: 1345: 1333:Main article: 1330: 1327: 1321: 1318: 1316:'s Xensation. 1272: 1269: 1266: 1263: 1260: 1257: 1254: 1251: 1248: 1245: 1242: 1238: 1234: 1229: 1226: 1223: 1219: 1215: 1210: 1207: 1204: 1201: 1198: 1195: 1192: 1189: 1186: 1183: 1179: 1159: 1156: 1077: 1074: 1072: 1069: 1033: 1030: 1007: 1004: 1001: 997: 976: 956: 928: 924: 919: 914: 909: 906: 903: 899: 895: 890: 886: 854:Main article: 851: 848: 838: 835: 808: 805: 800: 797: 794: 788: 785: 782: 757: 754: 751: 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1388:V 1365:c 1271:e 1268:v 1265:i 1262:s 1259:s 1256:e 1253:r 1250:p 1247:m 1244:o 1241:c 1233:+ 1228:0 1225:, 1222:y 1214:= 1209:d 1206:e 1203:i 1200:f 1197:i 1194:d 1191:o 1188:m 1185:= 1182:y 1006:0 1003:, 1000:y 975:d 955:k 927:x 923:d 918:k 913:+ 908:0 905:, 902:y 894:= 889:y 807:L 804:b 799:r 787:= 756:r 753:2 747:L 742:b 739:G 733:= 643:c 619:2 615:/ 611:3 601:c 596:b 593:G 590:= 524:) 507:G 491:( 456:b 453:G 444:y 408:3 395:= 329:b 305:G 249:b 246:G 240:= 235:d 69:) 63:( 58:) 54:( 40:.

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