ASTM E23-18 pdf free download.Standard Test Methods for Notched Bar Impact Testing of Metallic Materials.
1.1 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 A 1) verifying Charpy impact machines (see Annex A2), optional test specimen configurations (see Annex A3), designation of test specimen orientation (see Terminology El 23), and determining the shear fracture appearance (see Annex A4). In addition, information is provided on the significance of notched-bar impact testing (see Appendix X 1), and methods of measuring the center of strike (see Appendix X2).
1 .2 These test methods do not address the problems associated with impact testing at temperatures below —196 °C (77 K).
1 .3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1 .3.1 Exception—Section 9 and Annex A4 provide inchpound units for intormation only.
1 .4 This standard does not purport to address all of the safetV concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 6.
3.Terminology
3. 1 Definitions of Terms Specific to This Standard:
3. 1 . 1 absorbed energy [FL], ,n—work spent to fracture a specimen in a single pendulum swing, as measured by a compenstated indicating device.
3. 1 .2 direct verification, n—process that ensures all parts that may affect measured absorbed energy are within specified dimensional tolerances.
3. 1 .3 indirect verification, n—process that ensures the average absorbed energy from testing a set of verilication specimens corresponds to the certified absorbed energy within a specified tolerance (see A2.4. I).
3. 1 .4 lateral expansion [L], n—the maximum increase in the thickness of the specimen as a result of the impact test, expressed in mm.
3. 1 .4. 1 Discussion—Lateral expansion is used as a measure of ductility.
3. 1 .5 range capacity, n—maximum available energy for a specific pendulum setting.
3.1.5.1 Discussion—On single range machines this corresponds to the machine capacity.
3.1.6 shear fracture appearance, SFA, n—the amount of fracture surface in the specimen that failed in a shear (stable) mode, expressed in percent.ASTM E23 pdf download.