ASTM E23-07
(Test Method)Standard Test Methods for Notched Bar Impact Testing of Metallic Materials
Standard Test Methods for Notched Bar Impact Testing of Metallic Materials
SCOPE
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 X1), 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.
1.4 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.
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An American National Standard
Designation: E 23 – 07
Standard Test Methods for
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Notched Bar Impact Testing of Metallic Materials
ThisstandardisissuedunderthefixeddesignationE 23;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope E 399 Test Method for Linear-Elastic Plane-Strain Fracture
Toughness K of Metallic Materials
1.1 These test methods describe notched-bar impact testing Ic
E 604 Test Method for Dynamic Tear Testing of Metallic
of metallic materials by the Charpy (simple-beam) test and the
Materials
Izod (cantilever-beam) test. They give the requirements for:
E 691 Practice for Conducting an Interlaboratory Study to
test specimens, test procedures, test reports, test machines (see
Determine the Precision of a Test Method
AnnexA1) verifying Charpy impact machines (seeAnnexA2),
E 1313 Guide for Recommended Formats for Data Records
optional test specimen configurations (see Annex A3), pre-
Used in the Computerization of Mechanical Test Data for
cracking Charpy V-notch specimens (see Annex A4), designa-
Metals
tion of test specimen orientation (see Annex A5), and deter-
mining the percent of shear fracture on the surface of broken
3. Summary of Test Method
impact specimens (see Annex A6). In addition, information is
3.1 The essential features of an impact test are: a suitable
provided on the significance of notched-bar impact testing (see
specimen(specimensofseveraldifferenttypesarerecognized),
Appendix X1), methods of measuring the center of strike (see
a set of anvils, and specimen supports on which the test
Appendix X2).
specimen is placed to receive the blow of the moving mass, a
1.2 These test methods do not address the problems associ-
moving mass that has sufficient energy to break the specimen
ated with impact testing at temperatures below –196 °C (–320
placed in its path, and a device for measuring the energy
°F, 77 K).
absorbed by the broken specimen.
1.3 The values stated in SI units are to be regarded as the
standard. Inch-pound units are provided for information only.
4. Significance and Use
1.4 This standard does not purport to address all of the
4.1 These test methods of impact testing relate specifically
safety concerns, if any, associated with its use. It is the
to the behavior of metal when subjected to a single application
responsibility of the user of this standard to establish appro-
of a force resulting in multi-axial stresses associated with a
priate safety and health practices and determine the applica-
notch, coupled with high rates of loading and in some cases
bility of regulatory limitations prior to use. Specific precau-
with high or low temperatures. For some materials and
tionary statements are given in Section 5.
temperatures the results of impact tests on notched specimens,
when correlated with service experience, have been found to
2. Referenced Documents
2 predict the likelihood of brittle fracture accurately. Further
2.1 ASTM Standards:
information on significance appears in Appendix X1.
E 177 Practice for Use of the Terms Precision and Bias in
ASTM Test Methods
5. Precautions in Operation of Machine
5.1 Safety precautions should be taken to protect personnel
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These test methods are under the jurisdiction of ASTM Committee E28 on from the swinging pendulum, flying broken specimens, and
Mechanical Testing and are the direct responsibility of Subcommittee E28.07 on
hazards associated with specimen warming and cooling media.
Impact Testing.
Current edition approved March 1, 2007. Published May 2007. Originally
6. Apparatus
approved in 1933. Last previous edition approved 2006 as E 23 – 06.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or 6.1 General Requirements:
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.1.1 The testing machine shall be a pendulum type of rigid
Standards volume information, refer to the standard’s Document Summary page on
construction.
the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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E23–07
6.1.2 The testing machine shall be designed and built to to distinguish differences in very ductile materials or when
conform with the requirements given in Annex A1. using low testing velocities.
6.2 Inspection and Verification 7.1.3 The specimens shown in Figs. 1 and 2 are those most
6.2.1 Inspection procedures to verify impact machines di- widely used and most generally satisfactory. They
...
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