Izod Test

A pendulum type of single-blow impact test in which the specimen, usually notched, is fixed at one end and broken by a falling pendulum. The energy absorbed, as measured by the subsequent rise of the pendulum, is a measure of impact strength or notch toughness.

The 10mm square, 75mm long test piece has a notch 2mm deep, 0.25mm root radius and 45° included angle and is gripped in a vice. The knife edge pendulum hits on the same side as the notch, 22mm away from the centreline of the notch and the force measured.

See also: Ductile-to-Brittle Transition, Impact Energy.