ASTM D732-10
(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
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.
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 composite materials 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.
General Information
Relations
Buy Standard
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D732 − 10
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* 4. Significance and Use
1.1 This test method covers the procedure for determining 4.1 Shearstrengthobtainedbytheuseofpunch-typetooling
is one of the recognized methods of comparing materials, or
the shear strength of composite materials in the form of sheets,
plates, and molded shapes in thicknesses from 1.27 to 12.7 mm obtaining data for engineering design purposes, or both.
However, it must be recognized that for end-use applications
(0.050 to 0.500 in.).
therearelikelytobemanyfactorsnottakenintoaccountinthis
1.2 The values stated in SI units are to be regarded as the
test method, such as stress-concentrating geometries and rates
standard. The values given in parentheses are for information
of shear, which can profoundly affect the measured shear
only.
strength.Moreover,thefactthattheshearstrengthiscalculated
1.3 This standard does not purport to address all of the
by dividing the load by the area of the sheared edge (punch
safety concerns, if any, associated with its use. It is the
circumference X specimen thickness) does not interpret as
responsibility of the user of this standard to establish appro-
indicating the shear strength value so obtained is solely a
priate safety and health practices and determine the applica-
material property, independent of thickness.
bility of regulatory limitations prior to use.
4.2 For many materials, it is possible that there is a
NOTE 1—There is no known ISO equivalent to this standard.
specification that requires the use of this test method, but with
some procedural modifications that take precedence when
2. Referenced Documents
adhering to the specification. Therefore, it is advisable to refer
2
2.1 ASTM Standards:
to that material specification before using this test method.
D618 Practice for Conditioning Plastics for Testing
Table 1 of Classification System D4000 lists the ASTM
D4000 Classification System for Specifying Plastic Materi-
materials standards that currently exist.
als
5. Apparatus
E4 Practices for Force Verification of Testing Machines
5.1 Testing Machine—Any suitable testing machine of the
E691 Practice for Conducting an Interlaboratory Study to
constant-rate-of-crosshead movement type. The testing ma-
Determine the Precision of a Test Method
chine shall be equipped with the necessary drive mechanism
3. Terminology for imparting to the crosshead a uniform, controlled velocity
with respect to the base. The testing machine shall also be
3.1 Definitions:
equipped with a load-indicating mechanism capable of show-
3.1.1 shear strength—the maximum load required to shear
ing the total compressive load carried by the test specimen.
the specimen in such a manner that the moving portion of the
This mechanism shall be essentially free from inertia-lag at the
load fixture has completely cleared the stationary portion,
specified rate of testing and shall indicate the load with an
divided by the sheared area. It is expressed in megapascals (or
accuracy of 61 % of the indicated value or better. The
pounds-force per square inch) based on the area of the sheared
accuracy of the testing machine shall be verified in accordance
edge or edges.
with Practices E4.
5.2 Shear Tool—A shear tool of the punch type which is so
1
This test method is under the jurisdiction ofASTM Committee D20 on Plastics constructed that the specimen is rigidly clamped both to the
and is the direct responsibility of Subcommittee D20.10 on Mechanical Properties.
stationary block and movable block so that it cannot be
Current edition approved April 1, 2010. Published April 2010. Originally
deflected during the test.Asuitable form of shear tool is shown
approved in 1943. Last previous edition approved in 2009 as D732 – 09. DOI:
in Fig. 1.
10.1520/D0732-10.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.3 Micrometers—Suitable micrometers for measuring the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
thickness of the test specimen to an incremental discrimination
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. of at least 0.025 mm (0.001 in.).
*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. Uni
...
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:D732–09 Designation: D732 – 10
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 Department of Defense.
1. Scope*
1.1 Thistestmethodcoverstheprocedurefordeterminingtheshearstrengthofcompositematerialsintheformofsheets,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.
2. Referenced Documents
2
2.1 ASTM Standards:
D618 Practice for Conditioning Plastics for Testing
D4000 Classification System for Specifying Plastic Materials
D4066Classification System for Nylon Injection and Extrusion Materials (PA)
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 Definition:
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 megapascals (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.
5. Apparatus
5.1 Testing Machine—Anysuitabletestingmachineoftheconstant-rate-of-crossheadmovementtype.Thetestingmachineshall
be equipped with the necessary drive mechanism for imparting to the crosshead a uniform, controlled velocity with respect to the
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 Oct. 15, 2009. Published November 2009. Originally approved in 1943. Last previous edition approved in 2002 as D732–02. DOI:
10.1520/D0732-09.
CurrenteditionapprovedApril1,2010.PublishedApril2010.Originallyapprovedin1943.Lastpreviouseditionapprovedin2009asD732 – 09.DOI:10.1520/D0732-10.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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
---------------------- Page: 1 ----------------------
D732 – 10
base. The testing machine shall also be equipped with a load-indicating mechanism capable of showing the total compressive load
carried by the test specimen. This mechanism shall be essentially free from inertia-lag at the specified rate of t
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.