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methods are used and results are based only on the cross-sectional area at the notch (J/m). The dimensions of a standard specimen for ASTM D256 are 63.5 × 12.7 × 3.2 mm (2.5 × 0.5 × 0.125 in). The most common specimen thickness is 3.2 mm (0.13 in), but the width can vary between 3.0 and 12.7 mm (0.12 and 0.50 in).
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standard for Izod Impact testing of plastics is ASTM D256. The results are expressed in energy lost per unit of thickness (such as ft·lb/in or J/cm) at the notch. Alternatively, the results may be reported as energy lost per unit cross-sectional area at the notch (J/m or ft·lb/in). In Europe, ISO 180
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A material's toughness is a factor of its ability to absorb energy during relatively slow plastic deformation, though the rate at which strain occurs matters. Brittle materials have low toughness as a result of the small amount of plastic deformation they can endure at any rate. However, ductile
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and energy, and its effect is different when the same amount of energy is transferred more gradually. Everyday engineering structures are subjected to it and may develop cracks that, over time, propagate to a point where catastrophic failure would result.
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but uses a different arrangement of the specimen under test. The Izod impact test differs from the Charpy impact test in that the sample is held in a cantilevered beam configuration as opposed to a three-point bending configuration.
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sample, breaking the specimen. The energy absorbed by the sample is calculated from the height the arm swings to after hitting the sample. A notched sample is generally used to determine impact energy and notch sensitivity.
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BS EN ISO 13802:2006 - "Plastics. Verification of pendulum impact-testing machines. Charpy, Izod and tensile impact-testing"
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standard method of determining the impact resistance of materials. A pivoting arm is raised to a specific height (constant
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materials may behave like brittle materials under high-energy impact, hence the need for this kind of test.
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of various materials under the same test conditions, or of one material versus temperature to determine its
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transition temperature where a steep descent in impact strength with decreasing temperature is observed.
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the mass of the hammer which together with the velocity determines its kinetic energy at impact;
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the dimensions of the usually rectangular cross section of the sample below the notch;
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the height of the hammer at the start position, determining its velocity at impact;
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The test conditions are governed by many variables, most importantly:
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BS EN ISO 180:2001 - "Plastics. Determination of Izod impact strength"
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Scheme for the determination of Izod impact strength test results.
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Equipment and procedure to determine materials' impact resistance
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62:(1876–1946), who described it in his 1903 address to the
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208:Izod, Gilbert, 'Testing brittleness of steel',
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58:The test is named after the English engineer
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97:Impact tests are used in comparing the
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212:, 25 September 1903, pp. 431-2
135:the temperature of the sample.
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66:, subsequently published in
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50:The test is similar to the
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280:Liquid metal embrittlement
25:Blists Hill Victorian Town
295:Stress corrosion cracking
74:The need for impact tests
32:Izod impact strength test
227:Mechanical failure modes
300:Sulfide stress cracking
270:Hydrogen embrittlement
187:M. Joseph Gordon, Jr.
140:ASTM test for plastics
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23:Izod impact tester in
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371:Continuum mechanics
285:Mechanical overload
64:British Association
376:Fracture mechanics
164:Fracture mechanics
146:ASTM International
102:fracture toughness
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60:Edwin Gilbert Izod
52:Charpy impact test
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381:Materials testing
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245:Corrosion fatigue
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210:Engineering
68:Engineering
365:Categories
175:References
240:Corrosion
315:Yielding
265:Fracture
235:Buckling
153:See also
91:momentum
260:Fouling
255:Fatigue
110:brittle
106:ductile
44:notched
275:Impact
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87:Impact
34:is an
250:Creep
199:p.199
99:shear
310:Wear
193:ISBN
144:The
108:-to-
36:ASTM
30:The
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