ASTM E2248-12
(Test Method)Standard Test Method for Impact Testing of Miniaturized Charpy V-Notch Specimens
Standard Test Method for Impact Testing of Miniaturized Charpy V-Notch Specimens
SIGNIFICANCE AND USE
There are cases where it is impractical or impossible to prepare conventional CVN specimens. MCVN specimens are an alternative approach for characterizing notched specimen impact behavior. Typical applications include MCVN specimens prepared from the broken halves of previously tested specimens, from thin product form material, or from material cut from in-service components.
This standard establishes the requirements for performing impact tests on MCVN specimens fabricated from metallic materials. Minimum requirements are given for measurement and recording equipment such that similar sensitivity and comparable measurements, as compared to conventional CVN tests, are achieved. The user should be aware that the transition region temperature dependence data obtained from MCVN specimens are not directly comparable to those obtained from full-size standard Charpy-V specimens and suitable correlation procedures have to be employed to obtain ductile-to-brittle transition temperature (DBTT) data equivalent to those obtained using CVN specimens. In all instances, correlations will have to be developed to relate upper shelf energy (USE) data from MCVN test to CVN comparable energy levels. Application of MCVN test data to the evaluation of ferritic material behavior is the responsibility of the user of this test method. MCVN test data should not be used directly to determine the lowest allowable operating temperature for an in-service material. The data must be interpreted within the framework of a fracture mechanics assessment.
While this Test Method treats the use of an instrumented striker as an option, the use of instrumentation in the impact 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 specimen. The area under the force-displacement curve is a measure of absorbed energy. As an alternative, ...
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 E23. These are not the same as sub-size specimens, described in Annex A3 of Test Methods E23, 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 E23. 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 E23 specimens.
1.6 The MCVN test may be performed using a typical Test Methods E23 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 ...
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Designation: E2248 − 12
StandardTest Method for
1
Impact Testing of Miniaturized Charpy V-Notch Specimens
This standard is issued under the fixed designation E2248; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 1.7 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 Thistestmethoddescribesnotched-barimpacttestingof
responsibility of the user of this standard to establish appro-
metallic materials using Miniaturized Charpy V-Notch
priate safety and health practices and determine the applica-
(MCVN) specimens and test apparatus. It provides: (a)a
bility of regulatory limitations prior to use.
description of the apparatus, (b) requirements for inspection
andcalibration,(c)safetyprecautions,(d)sampling,(e)dimen-
2. Referenced Documents
sions and preparation of specimens, (f) testing procedures, and
2
(g) precision and bias.
2.1 ASTM Standards:
A370Test Methods and Definitions for Mechanical Testing
1.2 This standard concerns Miniaturized Charpy V-Notch
of Steel Products
specimens, for which all linear dimensions, including length
E23Test Methods for Notched Bar Impact Testing of Me-
and notch depth, are reduced with respect to a typeAstandard
tallic Materials
impact test specimen in accordance with Test Methods E23.
E177Practice for Use of the Terms Precision and Bias in
These are not the same as sub-size specimens, described in
ASTM Test Methods
AnnexA3 of Test Methods E23, for which length, notch angle
E691Practice for Conducting an Interlaboratory Study to
andnotchdeptharethesameasforthestandardtypeACharpy
Determine the Precision of a Test Method
specimen. See also 1.5 below.
E2298Test Method for Instrumented Impact Testing of
1.3 Comparison of the MCVN data with conventional
Metallic Materials
CharpyV-Notch(CVN)dataorapplicationoftheMCVNdata,
3
2.2 ISO Standards:
or both, to the evaluation of ferritic material behavior is the
ISO 148Metallic materials -- Charpy pendulum impact test
responsibility of the user of this test method and is not
-- Part 1: Test method
explicitly covered by this test method.
ISO 14556Steel -- Charpy V-notch pendulum impact test --
1.4 The values stated in SI units are to be regarded as
Instrumented test method
standard. No other units of measurement are included in this
standard.
3. Summary of Test Method
1.5 This standard does not address testing of sub-size
3.1 The essential features of the MCVN impact test are: (a)
specimens as discussed in Test Methods E23. The reader
a suitable miniature three point bend specimen, (b) anvils and
should understand the distinction between miniature and sub-
supports on which the test specimen is placed to receive the
size. Miniature specimens are shorter that sub-size specimens
blow of the moving mass, (c) a moving mass (striker) that has
so that more tests can be conducted per unit volume of
been released from a sufficient height to cause the mass to
material. Moreover, miniature specimens are designed so that
break the specimen placed in its path, (d) a device for
the stress fields which control fracture are similar to those of
determining the energy absorbed by the broken specimen, and
conventional Test Methods E23 specimens.
optionally (e) instrumentation for measuring applied force as a
1.6 The MCVN test may be performed using a typical Test
functionoftimeduringspecimenloading(refertoTestMethod
Methods E23 test machine with suitably modified anvils and
E2298).
striker or using a smaller capacity machine.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This test method is under the jurisdiction of ASTM Committee E28 on contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Mechanical Testing and is the direct responsibility of Subcommittee E28.07 on Standards volume information, refer to the standard’s Document Summary page on
Impact Testing. the ASTM website.
3
Current edition approved April 1, 2012. Published May 2012. Originally Available from International Organization for Standardization (ISO), 1, ch. de
approved in 2009. Last previous edition approved in 2009 as E2248–09. DOI: la Voie-Creuse, Case postale 56, CH-1211, Geneva 20, Switzerland, http://
10.1520/E2248-12. www.iso.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E2248 − 12
3.2 Thetestconsistsofbreakingtheminiaturizedspecimen, duringcontactofthestrikerwiththespecimen.Theareaunder
notched in the middle, and supported at ea
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:E2248–09 Designation: E2248 – 12
Standard Test Method for
1
Impact Testing of Miniaturized Charpy V-Notch Specimens
This standard is issued under the fixed designation E2248; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
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 typeAstandard impact test specimen in accordance with Test Methods E23. These are
not the same as sub-size specimens, described in Annex A3 of Test Methods E23, 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 E23. 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 E23 specimens.
1.6 The MCVN test may be performed using a typical Test Methods E23 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
2
2.1 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
3
2.2 ISO Standards:
ISO 148 Metallic materials -- Charpy pendulum impact test -- Part 1: Test method
ISO 14556 Steel -- Charpy V-notch pendulum impact test -- Instrumented test method
3. Summary of Test Method
3.1 The essential features of the MCVN impact test are: (a) a suitable miniature three point bend specimen, (b) anvils and
supports on which the test specimen is placed to receive the blow of the moving mass, (c) a moving mass (striker) that has been
released from a sufficient height to cause the mass to break the specimen placed in its path, (d) a device for determining the energy
absorbed by the broken specimen, and optionally (e) instrumentation for measuring applied force as a function of time during
specimen loading (refer to Test Method E2298).
3.2 The test consists of breaking the miniaturized specimen, notched in the middle, and supported at each end, with one blow
1
This test method is under the jurisdiction of ASTM Committee E28 on Mechanical Testing and is the direct responsibility of Subcommittee E28.07 on Impact Testing.
Current edition approved April 1, 2009. Published April 2009. DOI: 10.1520/E2248-09.
Current edition approvedApril 1, 2012. Published May 2012. Originally approved in 2009. Last previous edition approved in 2009 as E2248–09. DOI: 10.1520/E2248-12.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For AnnualBookofASTM Standards
volume information, refer to the standard’s
...
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