ASTM E2248-2013 Standard Test Method for Impact Testing of Miniaturized Charpy V-Notch Specimens《小型v型缺口试样冲击试验的标准试验方法》.pdf
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1、Designation: E2248 12E2248 13Standard Test Method forImpact Testing of Miniaturized Charpy V-Notch Specimens1This standard is issued under the fixed designation E2248; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of las
2、t revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method describes notched-bar impact testing of metallic materials using Miniaturized Charpy V-Notch (MCVN)speci
3、mens 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 Char
4、py V-Notch specimens, for which all linear dimensions, including length andnotch depth, are reduced with respect to a type A standard impact test specimen in accordance with Test Methods E23. These arenot the same as sub-size specimens, described in Annex A3 of Test Methods E23, for which length, no
5、tch angle and notch depthare 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
6、of this test method and is not explicitly covered bythis 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 E23. The re
7、ader shouldunderstand the distinction between miniature and subsize. Miniature specimens are shorter that sub-size specimens so that moretests can be conducted per unit volume of material. Moreover, miniature specimens are designed so that the stress fields whichcontrol fracture are similar to those
8、 of conventional Test Methods E23 specimens.1.6 The MCVN test may be performed using a typical Test Methods E23 test machine with suitably modified anvils and strikeror using a smaller capacity machine.1.7 This standard does not purport to address all of the safety concerns, if any, associated with
9、its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A370 Test Methods and Definitions for Mechanical Testing of Steel Produc
10、tsE23 Test Methods for Notched Bar Impact Testing of Metallic MaterialsE177 Practice for Use of the Terms Precision and Bias in ASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test MethodE2298 Test Method for Instrumented Impact Testing of Metal
11、lic Materials2.2 ISO Standards:3ISO 148 Metallic materials - Charpy pendulum impact test - Part 1: Test methodISO 14556 Steel - Charpy V-notch pendulum impact test - Instrumented test method3. Summary of Test Method3.1 The essential features of the MCVN impact test are: (a) a suitable miniature thre
12、e point bend specimen, (b) anvils andsupports on which the test specimen is placed to receive the blow of the moving mass, (c) a moving mass (striker) that has been1 This test method is under the jurisdiction of ASTM Committee E28 on Mechanical Testing and is the direct responsibility of Subcommitte
13、e E28.07 on Impact Testing.Current edition approved April 1, 2012April 1, 2013. Published May 2012April 2013. Originally approved in 2009. Last previous edition approved in 20092012 asE224809.12. DOI: 10.1520/E2248-12.10.1520/E2248-13.2 For referencedASTM standards, visit theASTM website, www.astm.o
14、rg, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 Available from International Organization for Standardization (ISO), 1, ch. de la Voie-Creuse, Case postale 56, CH-1211, Gen
15、eva 20, Switzerland, http:/www.iso.org.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM
16、recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1released
17、from a sufficient height to cause the mass to break the specimen placed in its path, (d) a device for determining the energyabsorbed by the broken specimen, and optionally (e) instrumentation for measuring applied force as a function of time duringspecimen loading (refer to Test Method E2298).3.2 Th
18、e test consists of breaking the miniaturized specimen, notched in the middle, and supported at each end, with one blowfrom a swinging pendulum under conditions defined hereafter.4. Significance and Use4.1 There are cases where it is impractical or impossible to prepare conventional CVN specimens. MC
19、VN specimens are analternative approach for characterizing notched specimen impact behavior. Typical applications include MCVN specimensprepared from the broken halves of previously tested specimens, from thin product form material, or from material cut fromin-service components.4.2 This standard es
20、tablishes the requirements for performing impact tests on MCVN specimens fabricated from metallicmaterials. Minimum requirements are given for measurement and recording equipment such that similar sensitivity and comparablemeasurements, as compared to conventional CVN tests, are achieved. The user s
21、hould be aware that the transition regiontemperature dependence data obtained from MCVN specimens are not directly comparable to those obtained from full-sizestandard Charpy-V specimens and suitable correlation procedures have to be employed to obtain ductile-to-brittle transitiontemperature (DBTT)
22、data equivalent to those obtained using CVN specimens. In all instances, correlations will have to bedeveloped to relate upper shelf energy (USE) data from MCVN test to CVN comparable energy levels.Application of MCVN testdata to the evaluation of ferritic material behavior is the responsibility of
23、the user of this test method. MCVN test data should notbe used directly to determine the lowest allowable operating temperature for an in-service material. The data must be interpretedwithin the framework of a fracture mechanics assessment.4.3 While this Test Methodtest method treats the use of an i
24、nstrumented striker as an option, the use of instrumentation in theimpact test is recommended and is fully described in Test Method E2298. In order to establish the force-displacement diagram,it is necessary to measure the impact force as a function of time during contact of the striker with the spe
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