ASTM B598-14a
(Practice)Standard Practice for Determining Offset Yield Strength in Tension for Copper Alloys (Withdrawn 2019)
Standard Practice for Determining Offset Yield Strength in Tension for Copper Alloys (Withdrawn 2019)
SIGNIFICANCE AND USE
5.1 This practice may be used for approximating a limiting design stress at room temperature and, in some cases, for approximating the range of elastic behavior. Elastic limit, or the greatest stress that a material is capable of sustaining without any permanent strain remaining upon complete release of the stress, is a more technically accurate design parameter; however, the elastic limit is extremely difficult to measure in routine testing. Caution should be used in applying such values to predict the behavior of flat or wire springs in bending, torsion or other stress modes, or at temperatures other than that at which the determination is made.
SCOPE
1.1 This practice establishes the requirements for determining offset yield strength (0.01 %, 0.02 %, and 0.05 % offset) at room temperature. It is intended for copper alloys in tempers commonly used for spring applications, and materials thicker than 0.010 in. (0.25 mm).
1.1.1 The primary application of this practice is intended for flat strip materials that are used for springs; however, this practice can be used for other product forms, such as wire, rod, and bar.
1.2 Units—Values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units which are provided for information only and are not considered standard.
1.3 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.
WITHDRAWN RATIONALE
This practice establishes the requirements for determining offset yield strength (0.01 %, 0.02 %, and 0.05 % offset) at room temperature. It is intended for copper alloys in tempers commonly used for spring applications, and materials thicker than 0.010 in. (0.25 mm). The primary application of this practice is intended for flat strip materials that are used for springs; however, this practice can be used for other product forms, such as wire, rod, and bar.
Formerly under the jurisdiction of Committee B05 on Copper and Copper Alloys, this practice was withdrawn in April 2019. This standard is being withdrawn without replacement due to its redundancy with Test Methods E8/E8M.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: B598 − 14a
Standard Practice for
Determining Offset Yield Strength in Tension for Copper
1
Alloys
This standard is issued under the fixed designation B598; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* 3. Terminology
3.1 For definitions of terms related to copper and copper
1.1 This practice establishes the requirements for determin-
alloys, refer to Terminology B846.
ing offset yield strength (0.01 %, 0.02 %, and 0.05 % offset) at
room temperature. It is intended for copper alloys in tempers
3.2 For definitions of terms related to mechanical testing,
commonly used for spring applications, and materials thicker
refer to Terminology E6.
than 0.010 in. (0.25 mm).
1.1.1 The primary application of this practice is intended for
4. Summary of Practice
flat strip materials that are used for springs; however, this
4.1 To determine the offset yield strength, it is necessary to
practice can be used for other product forms, such as wire, rod,
acquire data (autographic or numerical) from which a stress-
and bar.
strain diagram may be drawn. The stress at which a specified
1.2 Units—Values stated in inch-pound units are to be
deviation of strain from the linear portion of the stress-strain
regarded as standard. The values given in parentheses are
curve occurs is the yield strength at that particular offset.
mathematical conversions to SI units which are provided for
information only and are not considered standard.
5. Significance and Use
1.3 This standard does not purport to address all of the
5.1 This practice may be used for approximating a limiting
safety concerns, if any, associated with its use. It is the
design stress at room temperature and, in some cases, for
responsibility of the user of this standard to establish appro-
approximating the range of elastic behavior. Elastic limit, or
priate safety and health practices and determine the applica-
the greatest stress that a material is capable of sustaining
bility of regulatory limitations prior to use.
without any permanent strain remaining upon complete release
of the stress, is a more technically accurate design parameter;
2. Referenced Documents
however, the elastic limit is extremely difficult to measure in
2 routine testing. Caution should be used in applying such values
2.1 ASTM Standards:
to predict the behavior of flat or wire springs in bending,
B846 Terminology for Copper and Copper Alloys
torsion or other stress modes, or at temperatures other than that
E4 Practices for Force Verification of Testing Machines
at which the determination is made.
E6 Terminology Relating to Methods of Mechanical Testing
E8/E8M Test Methods for Tension Testing of Metallic Ma-
6. Apparatus
terials
E83 Practice for Verification and Classification of Exten-
6.1 Standard testing machine of adequate capacity, con-
someter Systems
forming to the requirements of Practices E4.
6.2 Class B-1 or more accurate Extensometers, conforming
to the requirements of Practice E83 and suitable to the tension
1
This practice is under the jurisdiction ofASTM Committee B05 on Copper and
test specimen required for the application.
CopperAlloys and is the direct responsibility of Subcommittee B05.06 on Methods
of Test. 6.3 Extensometer Calibrator, or similar device accurate to
Current edition approved Sept. 1, 2014. Published September 2014. Originally
0.00002 in. (0.0005 mm).
approved in 1974. Last previous edition approved in 2014 as B598 – 14. DOI:
10.1520/B0598-14A.
2
7. Test Specimen
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
7.1 Tension test specimens shall be selected from Test
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Methods E8/E8M as appropriate for the product form.
*A Summary of Changes section appears at the end of this standard
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B598 − 14a
8. Procedure 9. Calculation and Report
9.1 Determine the load where the offset line intersects the
8.1 Follow the accepted practices for preparation to perform
stress-strain curve. This load in pounds divided by the original
a tension test in accordance with Test Methods E8/E8M.
cross section area is the yield strength and is reported as yield
Special care in the preparation of thin-gage samples, including
streng
...
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