ASTM B769-06
(Test Method)Standard Test Method for Shear Testing of Aluminum Alloys
Standard Test Method for Shear Testing of Aluminum Alloys
SCOPE
1.1 This test method covers double-shear testing of wrought and cast aluminum products to determine shear ultimate strengths. Note 1
The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are provided for information only.
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.
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Designation:B769–06
Standard Test Method for
1
Shear Testing of Aluminum Alloys
This standard is issued under the fixed designation B769; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope* 5. Significance and Use
1.1 Thistestmethodcoversdouble-sheartestingofwrought 5.1 The intent of this method is to provide a means of
and cast aluminum products to determine shear ultimate measuring the ultimate shear strength of aluminum-alloy
strengths. wrought and cast products. Data obtained by this method are
usedtocalculateminimumpropertiesthatcanbeutilizedinthe
NOTE 1—Thevaluesstatedininch-poundunitsaretoberegardedasthe
design of structural members such as found in aircraft. It is
standard. The values given in parentheses are provided for information
recognized that loading conditions developed by this method,
only.
and by most others, are not ideal in that they do not strictly
1.2 This standard does not purport to address all of the
satisfy the definition of pure shear. However, rarely do pure
safety concerns, if any, associated with its use. It is the
shear conditions exist in structures.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- NOTE 2—ThismethodisnotinterchangeablewiththatdescribedinTest
Method B565. Shear strengths obtained by Test Method B565 are about
bility of regulatory limitations prior to use.
10% lower than those developed by this test method.
2. Referenced Documents
5.2 The presence of a lubricant on the surface of the
2.1 The following documents of the issue in effect on the specimen and jig may result in shear strengths up to 3% lower
dateofmaterialpurchase,unlessotherwisenotedformapartof
thanthosedeterminedintheabsenceoflubrication(see8.1and
this specification to the extent referenced herein: Test Method B565).
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2.2 ASTM Standards:
6. Apparatus
B565 Test Method for Shear Testing of Aluminum and
Aluminum-AlloyRivetsandCold-HeadingWireandRods 6.1 Testing Machines—The testing machines shall conform
E4 Practices for Force Verification of Testing Machines to the requirements of Practices E4. The loads used to
E6 Terminology Relating to Methods of Mechanical Test- determine the shear strength shall be within the loading range
ing of the testing machine as defined in PracticesE4.
6.2 Loading Device:
3. Terminology
6.2.1 The loading device shall be a double-shear test fixture
3.1 The definitions of terms relating to shear testing in of the type shown in Fig. 1. The fixture shall be made of tool
TerminologyE6 are applicable to the terms used in this test
steel having a Rockwell hardness from 60 to 62 HRC. A
method. suitable alternative is to use a lower-strength steel for the main
frame of the fixture and have only the steel inserts hardened
4. Summary of Test Method
from 60 to 62 HRC.
4.1 This test method consists of subjecting a machined
6.2.2 The shearing edges of the holes shall have a radius of
cylindrical test specimen to double-shear loading in a test jig
no more than 0.0005 in. (0.013 mm). The mating surfaces of
using a tension (or compression) testing machine to determine
the center and outside dies shall have a finish of 16 µin. R or
a
the shear stress required to fracture the specimen, that is, the
better. There shall be sufficient clearances between the die
shear strength.
interfaces to ensure that no binding occurs; clearance should
not exceed 0.002 in. (0.051 mm). Consequently, the rigidity of
the test fixture must be such that this clearance is maintained
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This test method is under the jurisdiction of ASTM Committee B07 on Light
throughout the test; in instances where the device is loaded in
Metals and Alloys and is the direct responsibility of Subcommittee B07.05 on
compression as in Fig. 1, care must be taken to ensure there is
Testing.
Current edition approved Sept. 1, 2006. Published September 2006. Originally
no binding between the dies at the interfaces during the test.
approved in 1987. Last previous edition approved in 2000 as B769–94 (2000).
6.2.3 The nominal length of the center and outside dies of
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
the tool shown in Fig. 1 is 1 in. (25.4 mm). It has been
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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demonstrated that die lengths of 0.5 in. (12.7 mm) for ⁄8-in.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
*A Summary of Changes section appears at the end of this standard.
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