ASTM D732-17
(Test Method)Standard Test Method for Shear Strength of Plastics by Punch Tool
Standard Test Method for Shear Strength of Plastics by Punch Tool
SIGNIFICANCE AND USE
4.1 Shear strength obtained by the use of punch-type tooling is one of the recognized methods of comparing materials, or obtaining data for engineering design purposes, or both. However, it must be recognized that for end-use applications there are likely to be many factors not taken into account in this test method, such as stress-concentrating geometries and rates of shear, which can profoundly affect the measured shear strength. Moreover, the fact that the shear strength is calculated by dividing the load by the area of the sheared edge (punch circumference X specimen thickness) does not interpret as indicating the shear strength value so obtained is solely a material property, independent of thickness.
4.2 For many materials, it is possible that there is a specification that requires the use of this test method, but with some procedural modifications that take precedence when adhering to the specification. Therefore, it is advisable to refer to that material specification before using this test method. Table 1 of Classification System D4000 lists the ASTM materials standards that currently exist.
SCOPE
1.1 This test method covers the procedure for determining the shear strength of plastics in the form of sheets, plates, and molded shapes in thicknesses from 1.27 to 12.7 mm (0.050 to 0.500 in.).
1.2 The values stated in SI 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 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.
Note 1: There is no known ISO equivalent to this standard.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D732 − 17
Standard Test Method for
1
Shear Strength of Plastics by Punch Tool
This standard is issued under the fixed designation D732; 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
1.1 This test method covers the procedure for determining 3.1 Definitions:
the shear strength of plastics in the form of sheets, plates, and
3.1.1 shear strength—the maximum load required to shear
molded shapes in thicknesses from 1.27 to 12.7 mm (0.050 to
the specimen in such a manner that the moving portion of the
0.500 in.).
load fixture has completely cleared the stationary portion,
divided by the sheared area. It is expressed in mega-pascals (or
1.2 The values stated in SI units are to be regarded as the
pounds-force per square inch) based on the area of the sheared
standard. The values given in parentheses are for information
edge or edges.
only.
1.3 This standard does not purport to address all of the
4. Significance and Use
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4.1 Shearstrengthobtainedbytheuseofpunch-typetooling
priate safety and health practices and determine the applica-
is one of the recognized methods of comparing materials, or
bility of regulatory limitations prior to use.
obtaining data for engineering design purposes, or both.
However, it must be recognized that for end-use applications
NOTE 1—There is no known ISO equivalent to this standard.
therearelikelytobemanyfactorsnottakenintoaccountinthis
1.4 This international standard was developed in accor-
test method, such as stress-concentrating geometries and rates
dance with internationally recognized principles on standard-
of shear, which can profoundly affect the measured shear
ization established in the Decision on Principles for the
strength.Moreover,thefactthattheshearstrengthiscalculated
Development of International Standards, Guides and Recom-
by dividing the load by the area of the sheared edge (punch
mendations issued by the World Trade Organization Technical
circumference X specimen thickness) does not interpret as
Barriers to Trade (TBT) Committee.
indicating the shear strength value so obtained is solely a
material property, independent of thickness.
2. Referenced Documents
2
4.2 For many materials, it is possible that there is a
2.1 ASTM Standards:
specification that requires the use of this test method, but with
D618 Practice for Conditioning Plastics for Testing
some procedural modifications that take precedence when
D4000 Classification System for Specifying Plastic Materi-
adhering to the specification. Therefore, it is advisable to refer
als
to that material specification before using this test method.
D5947 Test Methods for Physical Dimensions of Solid
Table 1 of Classification System D4000 lists the ASTM
Plastics Specimens
materials standards that currently exist.
E4 Practices for Force Verification of Testing Machines
E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method 5. Apparatus
5.1 Testing Machine—Any suitable testing machine of the
constant-rate-of-crosshead movement type. The testing ma-
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
chine shall be equipped with the necessary drive mechanism
and is the direct responsibility of Subcommittee D20.10 on Mechanical Properties.
for imparting to the crosshead a uniform, controlled velocity
Current edition approved May 1, 2017. Published June 2017. Originally
with respect to the base. The testing machine shall also be
approved in 1943. Last previous edition approved in 2010 as D732 – 10. DOI:
10.1520/D0732-17.
equipped with a load-indicating mechanism capable of show-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
ing the total compressive load carried by the test specimen.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
This mechanism shall be essentially free from inertia-lag at the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. specified rate of testing and shall indicate the load with an
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959.
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM 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: D732 − 10 D732 − 17
Standard Test Method for
1
Shear Strength of Plastics by Punch Tool
This standard is issued under the fixed designation D732; 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*Scope
1.1 This test method covers the procedure for determining the shear strength of composite materials plastics in the form of
sheets, plates, and molded shapes in thicknesses from 1.27 to 12.7 mm (0.050 to 0.500 in.).
1.2 The values stated in SI 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 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.
NOTE 1—There is no known ISO equivalent to this standard.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D618 Practice for Conditioning Plastics for Testing
D4000 Classification System for Specifying Plastic Materials
D5947 Test Methods for Physical Dimensions of Solid Plastics Specimens
E4 Practices for Force Verification of Testing Machines
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1 Definitions:
3.1.1 shear strength—the maximum load required to shear the specimen in such a manner that the moving portion of the load
fixture has completely cleared the stationary portion, divided by the sheared area. It is expressed in megapascalsmega-pascals (or
pounds-force per square inch) based on the area of the sheared edge or edges.
4. Significance and Use
4.1 Shear strength obtained by the use of punch-type tooling is one of the recognized methods of comparing materials, or
obtaining data for engineering design purposes, or both. However, it must be recognized that for end-use applications there are
likely to be many factors not taken into account in this test method, such as stress-concentrating geometries and rates of shear,
which can profoundly affect the measured shear strength. Moreover, the fact that the shear strength is calculated by dividing the
load by the area of the sheared edge (punch circumference X specimen thickness) does not interpret as indicating the shear strength
value so obtained is solely a material property, independent of thickness.
4.2 For many materials, it is possible that there is a specification that requires the use of this test method, but with some
procedural modifications that take precedence when adhering to the specification. Therefore, it is advisable to refer to that material
specification before using this test method. Table 1 of Classification System D4000 lists the ASTM materials standards that
currently exist.
1
This test method is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.10 on Mechanical Properties.
Current edition approved April 1, 2010May 1, 2017. Published April 2010June 2017. Originally approved in 1943. Last previous edition approved in 20092010 as
D732 – 09.D732 – 10. DOI: 10.1520/D0732-10.10.1520/D0732-17.
2
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 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
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D732 − 17
NOTE 1—In case of difficulty in obtaining hardened dowels and bushings, the entire shear tool may be made from a fairly good grade of steel,
eliminating all of the bushings shown. The actual working surfaces will wear faster tha
...
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