ASTM D732-02

Standard Test Method for Shear Strength of Plastics by Punch Tool

SIGNIFICANCE AND USE
Shear strength obtained by a tool of the punch type is one of the recognized methods of comparing materials or obtaining data for engineering design. However, it must be recognized that for end-use application there may be many factors not taken into account in this test method, such as stress-concentrating geometries and rates of shear, which can profoundly affect shear strength. Moreover, the fact that the shear strength is calculated by dividing the load by the area of the sheared edge (circumference X thickness) should not be interpreted as indicating that the shear strength value so obtained is solely a material property, independent of thickness.
For many materials, there may be 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 D 4000 lists the ASTM materials standards that currently exist.
SCOPE
1.1 This test method covers the punch-type of shear test and is intended for use in determining the shear strength of test specimens of organic plastics in the form of sheets and molded disks in thicknesses from 0.127 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

• Status: Historical
• Publication Date: 09-Apr-2002
• ICS: 83.080.01 - Plastics in general
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.10 - Mechanical Properties

Relations

• Replaces: ASTM D732-99 - Standard Test Method for Shear Strength of Plastics by Punch Tool
• Effective Date: 10-Apr-2002
• Replaced By: ASTM D732-09 - Standard Test Method for Shear Strength of Plastics by Punch Tool
• Effective Date: 15-Oct-2009
• Referred By: ASTM F2902-16e1 - Standard Guide for Assessment of Absorbable Polymeric Implants
• Effective Date: 10-Apr-2002
• Referred By: ASTM F561-19 - Standard Practice for Retrieval and Analysis of Medical Devices, and Associated Tissues and Fluids
• Effective Date: 10-Apr-2002
• Referred By: ASTM D7745-19 - Standard Practice for Testing Pultruded Composites
• Effective Date: 10-Apr-2002
• Referred By: ASTM E2634-18(2022) - Standard Specification for Flat Wall Insulating Concrete Form (ICF) Systems
• Effective Date: 10-Apr-2002
• Referred By: ASTM D4101-17e1 - Standard Classification System and Basis for Specification for Polypropylene Injection and Extrusion Materials
• Effective Date: 10-Apr-2002
• Referred By: ASTM F1855-00(2019) - Standard Specification for Polyoxymethylene (Acetal) for Medical Applications
• Effective Date: 10-Apr-2002
• Referred By: ASTM F755-19 - Standard Specification for Selection of Porous Polyethylene for Use in Surgical Implants
• Effective Date: 10-Apr-2002

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:D732–02
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* 4. Significance and Use
1.1 This test method covers the punch-type of shear test and 4.1 Shear strength obtained by a tool of the punch type is
is intended for use in determining the shear strength of test one of the recognized methods of comparing materials or
specimens of organic plastics in the form of sheets and molded obtaining data for engineering design. However, it must be
disks in thicknesses from 1.27 to 12.7 mm (0.050 to 0.500 in.). recognized that for end-use application there may be many
1.2 The values stated in SI units are to be regarded as the factors not taken into account in this test method, such as
standard. The values given in parentheses are for information stress-concentrating geometries and rates of shear, which can
only. profoundly affect shear strength. Moreover, the fact that the
1.3 This standard does not purport to address all of the shear strength is calculated by dividing the load by the area of
safety concerns, if any, associated with its use. It is the the sheared edge (circumference X thickness) should not be
responsibility of the user of this standard to establish appro- interpreted as indicating that the shear strength value so
priate safety and health practices and determine the applica- obtained is solely a material property, independent of thick-
bility of regulatory limitations prior to use. ness.
4.2 For many materials, there may be a specification that
NOTE 1—There is no known ISO equivalent to this standard.
requires the use of this test method, but with some procedural
modifications that take precedence when adhering to the
2. Referenced Documents
2 specification. Therefore, it is advisable to refer to that material
2.1 ASTM Standards:
specification before using this test method. Table 1 of Classi-
D618 Practice for Conditioning Plastics for Testing
fication System D4000 lists theASTM materials standards that
D4000 Classification System for Specifying Plastic Materi-
currently exist.
als
D4066 Classification System for Nylon Injection and Ex-
5. Apparatus
trusion Materials (PA)
5.1 Testing Machine—Any suitable testing machine of the
E4 Practices for Force Verification of Testing Machines
constant-rate-of-crosshead movement type. The testing ma-
E691 Practice for Conducting an Interlaboratory Study to
chine shall be equipped with the necessary drive mechanism
Determine the Precision of a Test Method
for imparting to the crosshead a uniform, controlled velocity
with respect to the base. The testing machine shall also be
3. Terminology
equipped with a load-indicating mechanism capable of show-
3.1 Definition:
ing the total compressive load carried by the test specimen.
3.1.1 shear strength—the maximum load required to shear
This mechanism shall be essentially free from inertia-lag at the
the specimen in such a manner that the moving portion has
specified rate of testing and shall indicate the load with an
completely cleared the stationary portion. It is expressed in
accuracy of 61 % of the indicated value or better. The
megapascals (or pounds-force per square inch) based on the
accuracy of the testing machine shall be verified in accordance
area of the sheared edge or edges.
with Practices E4.
5.2 Shear Tool—Ashear 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 10, 2002. Published June 2002. Originally
deflected during the test.Asuitable form of shear tool is shown
published as D732 – 43 T. Last previous edition D732 – 99. DOI: 10.1520/D0732-
02.
in Fig. 1.
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 [e-mail]. 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
of at least 0.025 mm (0.001 in.).
the ASTM website.
*A Summary of Changes section appears at the end of this standard.
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