ASTM E23-23a,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 (see Annex A1) verifying Charpy impact machines (see Annex A2), optional test specimen configurations (see Annex A3), designation of test specimen orientation (see Terminology E1823), and determining the shear fracture appearance (see Annex A4). In addition, information is provided on the significance of notched-bar impact testing (see Appendix X1), and methods of measuring the center of strike (see Appendix X2).

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

The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

Exception – Section 9 and Annex A4 provide inch-pound units for information only.