Izod impact strength test

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]

  1. ^ M. Joseph Gordon, Jr. Industrial Design of Plastics Products, Wiley 2003, ISBN 0-471-23151-7 p.199
  2. ^ Izod, Gilbert, 'Testing brittleness of steel', Engineering, 25 September 1903, pp. 431-2