Charpy impact test on plastic specimen

Charpy impact test

The Charpy impact test enables the ductility of metallic materials (e.g to EN ISO 148-1) and plastics (e.g. to EN ISO 179-1) to be determined. During the test the behavior of a rectangular block, notched on one side (usually with a V-notch, more rarely a U-notch) and temperature-conditioned (cooled or heated), is investigated at a high deformation rate (impact loading).

The Charpy impact test involves a pendulum hammer striking the un-notched rear side of the specimen with a defined kinetic energy and fracturing it. At the moment of impact on the specimen, a portion of the kinetic energy of the hammer is absorbed by deformation processes in the specimen. The amount of energy varies according to material and temperature. Depending on the energy absorbed in fracturing the specimen, the pendulum swing reaches a lower height on the other side. If the pendulum were allowed to swing with no specimen in place it would attain almost the same height as at the starting point. In this way the energy absorbed W (in joules) is determined for a defined material at a defined temperature.

Zwick can provide a range of test solutions for Charpy impact tests on metals and plastics.

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