Impact test

The impact test is a measure of stress in form of a stroke by a pendulum applied to a standardized test specimen.

Two different methods are known. According to Izod impact strength a defined stroke is applied by a pendulum which leads to breakage of the test piece.

From the height of the pendulum´s swing the forced needed to lead to breakage can be calculated.

Flexural impact test according to Charpy is applied to test specimen with high deformability which hardly would break by Izod.

A notched panel is stressed by a force applied from the top. The force counteracted by the panel is measured.