ASTM E23 – 07ae1 Standard Test Methods for Notched Bar Impact Testing of Metallic Materials
Significance and Use ASTM e23 pdf
These test methods of impact testing relate specifically to the behavior of metal when subjected to a single application of a force resulting in multi-axial stresses associated with a notch, coupled with high rates of loading and in some cases with high or low temperatures. For some materials and temperatures the results of impact tests on notched specimens, when correlated with service experience, have been found to predict the likelihood of brittle fracture accurately. Further information on significance appears in Appendix X1.
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 A1) verifying Charpy impact machines (see Annex A2), optional test specimen configurations (see Annex A3), precracking Charpy V-notch specimens (see Annex A4), designation of test specimen orientation (see Annex A5), and determining the percent of shear fracture on the surface of broken impact specimens (see Annex A6). In addition, information is provided on the significance of notched-bar impact testing (see Appendix X2), 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 (-320 F, 77 K).
1.3 The values stated in SI units are to be regarded as the standard. Inch-pound units are provided for information only.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 5.
2. Referenced Documents (purchase separately)
B925 Practices for Production and Preparation of Powder Metallurgy (PM) Test Specimens
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E399 Test Method for Linear-Elastic Plane-Strain Fracture Toughness K Ic of Metallic Materials
E604 Test Method for Dynamic Tear Testing of Metallic Materials
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E1313 Guide for Recommended Formats for Data Records Used in the Computerization of Mechanical Test Data for Metals
Charpy test; fracture appearance; Izod test; impact test; notched specimens; pendulum machine;