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will result elongated dimples, which are parabolic depressions that coalesce in planes of maximum shear stress. The depressions point back to the crack origin, and shear influenced failure will produce depressions that point in opposite directions on opposing fracture surfaces. Combined tension and
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and the matrix. Additionally, microvoids often form at grain boundaries or inclusions within the material. Microvoids grow during plastic flow of the matrix, and microvoids coalesce when adjacent microvoids link together or the material between microvoids experiences
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MVC proceeds in three stages: nucleation, growth, and coalescence of microvoids. The nucleation of microvoids can be caused by particle cracking or interfacial failure between
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212:{\displaystyle \ln \left({\frac {\bar {R}}{R_{0}}}\right)=\int \limits _{0}^{\epsilon _{q}}A\left({\frac {3\sigma _{m}}{2\sigma _{ys}}}\right)d\epsilon _{v}^{p}}
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will also produce the elongated dimple morphology, but the directions of the depressions will be in the same direction on both fracture surfaces.
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71:. Microvoid coalescence leads to fracture. Void growth rates can be predicted assuming continuum plasticity using the Rice-Tracey model:
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results in equiaxed dimples, which are spherical depressions a few micrometres in diameter that coalesce normal to the loading axis.
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606:. Milne, I., Ritchie, R. O., Karihaloo, B. L. (1st ed.). Amsterdam: Elsevier/Pergamon. 2003. pp. 186–192.
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MVC can result in three distinct fracture morphologies based on the type of loading at failure.
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is a constant typically equal to 0.283 (but dependent upon the stress triaxiality),
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MVC fracture surface morphologies for a) tension, b) shear, and c) bending failures
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image of microvoid coalescence seen on a ductile fracture surface of 6061-T6 Al
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Deformation and
Fracture Mechanics of Engineering Materials, Fourth Edition
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509:. Wright, Wendelin J. (Seventh ed.). Boston, MA. pp. 236–237.
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461:{\displaystyle {\bar {R}}={\frac {R_{1}+R_{2}+R_{3}}{3}}}
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557:Mechanical properties of engineered materials
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537:: CS1 maint: location missing publisher (
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505:Askeland, Donald R. (January 2015).
559:. Marcel Dekker. pp. 393–394.
389:produced by the stress triaxality:
603:Comprehensive structural integrity
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471:Fracture surface morphologies
326:{\displaystyle \epsilon _{q}}
264:{\displaystyle \sigma _{ys}}
295:{\displaystyle \sigma _{m}}
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382:{\displaystyle {\bar {R}}}
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661:Materials degradation
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353:{\displaystyle R_{o}}
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304:mean stress
650:Categories
492:References
630:cite book
622:190802556
533:cite book
525:903959750
405:¯
374:¯
315:ϵ
284:σ
250:σ
196:ϵ
173:σ
158:σ
133:ϵ
123:∫
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575:54091550
44:plastics
36:fracture
486:bending
302:is the
271:is the
69:necking
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221:where
636:link
618:OCLC
608:ISBN
571:OCLC
561:ISBN
539:link
521:OCLC
511:ISBN
32:MVC
21:SEM
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