Mechanical failure modes
Buckling
Corrosion
Creep
Fatigue
Fracture
Impact
Mechanical overload
Rupture
Thermal shock
Wear
Yielding
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Izod impact strength testing is an ASTM standard method of determining impact strength. A notched sample is generally used to determine impact strength.

The test is named after the English engineer Edwin Gilbert Izod (1876-1946), who described it in his 1903 address to the British Association, subsequently published in Engineering.^[1]

Impact is a very important phenomenon in governing the life of a structure. In the case of aircraft, impact can take place by the bird hitting the plane while it is cruising, during take off and landing there is impact by the debris present on the runway

An arm held at a specific height (constant potential energy) is released. The arm hits the sample and breaks it. From the energy absorbed by the sample, its impact strength is determined.

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.

This test can also be used to determine the notch sensitivity.

[edit] See also

• Charpy impact test
• Impact force
• Shock (mechanics)

[edit] References

[edit] External links

• http://www.matweb.com/reference/izod-impact.asp
• http://www.impactanalytical.com/techniques/izod.aspx