ASTM B598-98(2004)
(Practice)Standard Practice for Determining Offset Yield Strength in Tension for Copper Alloys
Standard Practice for Determining Offset Yield Strength in Tension for Copper Alloys
SIGNIFICANCE AND USE
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 covers the determination of the 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).
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This standard does not purport to address all of the safety problems, 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.
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Standards Content (Sample)
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Designation:B 598–98 (Reapproved2004)
Standard Practice for
Determining Offset Yield Strength in Tension for Copper
Alloys
This standard is issued under the fixed designation B 598; 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 (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 83 Practice for Verification and Classification of Exten-
someters
1.1 This practice establishes the requirements for determin-
ing offset yield strength (0.01 %, 0.02 %, and 0.05 % offset) at
3. Terminology
room temperature. It is intended for copper alloys in tempers
3.1 Thedefinitionsoftermsrelatingtomechanicaltestingin
commonly used for spring applications, and materials thicker
Terminology E 6 apply.
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 The values stated in inch pound units are the standard.
deviation of strain from the linear portion of the stress-strain
The SI values given in parentheses are for information only.
curve occurs is the yield strength at that particular offset.
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Significance and Use
responsibility of the user of this standard to establish appro-
5.1 This practice may be used for approximating a limiting
priate safety and health practices and determine the applica-
design stress at room temperature and, in some cases, for
bility of regulatory limitations prior to use.
approximating the range of elastic behavior. Elastic limit, or
the greatest stress that a material is capable of sustaining
2. Referenced Documents
without any permanent strain remaining upon complete release
2.1 The following documents in effect on the date that the
of the stress, is a more technically accurate design parameter;
material is tested form a part of this practice, to the extent
however, the elastic limit is extremely difficult to measure in
referenced herein:
2 routine testing. Caution should be used in applying such values
2.2 ASTM Standards:
to predict the behavior of flat or wire springs in bending,
E 4 Practices for Force Verification of Testing Machines
torsion or other stress modes, or at temperatures other than that
E 6 Terminology Relating to Methods of Mechanical Test-
at which the determination is made.
ing
E 8 Test Methods for Tension Testing of Metallic Materials
6. Apparatus
E 74 Practice for Calibration of Force Measuring Instru-
6.1 Standard testing machine of adequate capacity, con-
ments for Verifying the Load Indication of Testing Ma-
forming to the requirements of Practices E 4 and E 74.
chines
6.2 Class B-1 or more accurate Extensometers, conforming
to the requirements of Practice E 83 and suitable to the tension
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
6.3 Extensometer Calibrator, or similar device accurate to
of Test.
0.00002 in. (0.0005 mm).
Current edition approved May 1, 2004. Published May 2004. Originally
approved in 1974. Last previous edition approved in 1998 as B 598 – 98.
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
Methods E 8 as appropriate for the product form.
the ASTM website.
*A Summary of Changes section appears at the end of this standard.
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