1.1 This test method describes notched-bar impact testing of metallic materials using Miniaturized Charpy V-Notch (MCVN) specimens and test apparatus. It provides: (a) a description of the apparatus, (b) requirements for inspection and calibration, (c) safety precautions, (d) sampling, (e) dimensions and preparation of specimens, (f) testing procedures, and (g) precision and bias. 1.2 This standard concerns Miniaturized Charpy V-Notch specimens, for which all linear dimensions, including length and notch depth, are reduced with respect to a type A standard impact test specimen in accordance with Test Methods E 23. These are not the same as sub-size specimens, described in Annex A3 of E 23, for which length, notch angle and notch depth are the same as for the standard type A Charpy specimen. See also 1.5 below. 1.3 Comparison of the MCVN data with conventional Charpy V-Notch (CVN) data and/or application of the MCVN data to the evaluation of ferritic material behavior is the responsibility of the user of this test method and is not explicitly covered by this test method. 1.4 The values stated in SI units are to be regarded as the standard. 1.5 This standard does not address testing of subsize specimens as discussed in Test Methods E 23. The user should understand the distinction between miniaturized and subsize. Miniaturized specimens are shorter than subsize specimens so that more tests can be conducted per unit volume of material. Further, miniaturized specimens are designed so that the stress fields which control fracture are similar to those of conventional Test Methods E 23 specimens. 1.6 The MCVN test may be performed using a typical Test Methods E 23 test machine with suitably modified anvils and striker or using a smaller capacity machine. 1.7 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.
People have been testing miniaturized Charpy specimens for many years, but an official ASTM does not exist yet.
KeywordsMiniaturized Charpy specimens; impact tests; instrumented Charpy specimens
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Ballot Item Approved as E2248-2009 and Pending Publication