Charpy Test

An impact test in which a V-notched, keyhole-notched, or U-notched specimen, supported at both ends horizontally, is struck behind the notch by a striker mounted at the lower end of a pendulum; the energy that is absorbed in fracture is calculated from the height to which the striker would have risen had there been no specimen and the height to which it actually rises after fracture of the specimen.

The test specimen is 2 or 2.165 long, 0.394 square and has a key hole type notch in the centre made by centreing a No. 47 drill 0.160 from one side and sawing through the hole.

See also: Impact Energy, Izod Test.

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Subjects: Mechanical Engineering