Equipment and procedure to determine materials' impact resistance
Izod impact tester in Blists Hill Victorian Town
The Izod impact strength test is an ASTM standard method of determining the impact resistance of materials. A pivoting arm is raised to a specific height (constant potential energy) and then released. The arm swings down hitting a notched 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.
The test is similar to the Charpy impact test but uses a different arrangement of the specimen under test.[1] 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.
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.[2]
^M. Joseph Gordon, Jr. Industrial Design of Plastics Products, Wiley 2003, ISBN 0-471-23151-7 p.199
^Izod, Gilbert, 'Testing brittleness of steel', Engineering, 25 September 1903, pp. 431-2
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