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ASTM E23 – Standard Test Methods for Notched Bar Impact Testing of Metallic Materials


These test methods describe notched-bar impact testing of metallic materials by the Charpy (simple-beam) test and the Izod (cantilever-beam) test. They give the requirements for: test specimens, test procedures, test reports, test machines verifying Charpy impact machines, optional test specimen configurations, designation of test specimen orientation, and determining the shear fracture appearance.

In addition, information is provided on the significance of notched-bar impact testing, and methods of measuring the center of strike.

These test methods do not address the problems associated with impact testing at temperatures below –196 °C (77 K).


Charpy test; shear fracture appearance; impact test; Izod test; notched specimens; pendulum machine