1. Scope

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 Test Methods 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 or application of the MCVN data, or both, 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 standard. No other units of measurement are included in this standard.

1.5 This standard does not address testing of sub-size specimens as discussed in Test Methods E 23 . The reader should understand the distinction between miniature and subsize. Miniature specimens are shorter that sub-size specimens so that more tests can be conducted per unit volume of material. Moreover, miniature 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.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

A370 Test Methods and Definitions for Mechanical Testing of Steel Products

E23 Test Methods for Notched Bar Impact Testing of Metallic Materials

E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods

E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

E2298 Test Method for Instrumented Impact Testing of Metallic Materials

ISO Standards

Keywords

fracture appearance; impact test; instrumented impact test; lateral expansion; miniaturized Charpy test; notched specimens; pendulum machine;

ICS Code

ICS Number Code 77.040.10 (Mechanical testing of metals)

DOI: 10.1520/E2248-09

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