ASTM D732-99

Standard Test Method for Shear Strength of Plastics by Punch Tool

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

• Replaced By: ASTM D732-02 - Standard Test Method for Shear Strength of Plastics by Punch Tool
• 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
• 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

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 732 – 99
Standard Test Method for
Shear Strength of Plastics by Punch Tool
This standard is issued under the fixed designation D 732; 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 * 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 0.127 to 12.7 mm (0.050 to 0.500 recognized that for end-use application there may be many
in.). factors not taken into account in this test method, such as
1.2 The values stated in SI units are to be regarded as the stress-concentrating geometries and rates of shear, which can
standard. The values given in parentheses are for information profoundly affect shear strength. Moreover, the fact that the
only. shear strength is calculated by dividing the load by the area of
1.3 This standard does not purport to address all of the the sheared edge (circumference X thickness) should not be
safety concerns, if any, associated with its use. It is the interpreted as indicating that the shear strength value so
responsibility of the user of this standard to establish appro- obtained is solely a material property, independent of thick-
priate safety and health practices and determine the applica- ness.
bility of regulatory limitations prior to use. 4.2 For many materials, there may be a specification that
requires the use of this test method, but with some procedural
NOTE 1—There is no known ISO equivalent to this standard.
modifications that take precedence when adhering to the
specification. Therefore, it is advisable to refer to that material
2. Referenced Documents
specification before using this test method. Table 1 of Classi-
2.1 ASTM Standards:
fication System D 4000 lists the ASTM materials standards that
D 618 Practice for Conditioning Plastics and Electrical
2 currently exist.
Insulating Materials for Testing
D 4000 Classification System for Specifying Plastic Mate-
5. Apparatus
rials
5.1 Testing Machine—Any suitable testing machine of the
D 4066 Specification for Nylon Injection and Extrusion
constant-rate-of-crosshead movement type. The testing ma-
Materials
4 chine shall be equipped with the necessary drive mechanism
E 4 Practices for Load Verification of Testing Machines
for imparting to the crosshead a uniform, controlled velocity
E 691 Practice for Conducting an Interlaboratory Study to
5 with respect to the base. The testing machine shall also be
Determine the Precision of a Test Method
equipped with a load-indicating mechanism capable of show-
ing the total compressive load carried by the test specimen.
3. Terminology
This mechanism shall be essentially free from inertia-lag at the
3.1 Definition:
specified rate of testing and shall indicate the load with an
3.1.1 shear strength—the maximum load required to shear
accuracy of 61 % of the indicated value or better. The
the specimen in such a manner that the moving portion has
accuracy of the testing machine shall be verified in accordance
completely cleared the stationary portion. It is expressed in
with Practices E 4.
megapascals (or pounds-force per square inch) based on the
5.2 Shear Tool—A shear tool of the punch type which is so
area of the sheared edge or edges.
constructed that the specimen is rigidly clamped both to the
stationary block and movable block so that it cannot be
This test method is under the jurisdiction of ASTM Committee D-20 on Plastics
deflected during the test. A suitable form of shear tool is shown
and is the direct responsibility of Subcommittee D 20.10 on Mechanical Properties.
in Fig. 1.
Current edition approved March 10, 1999. Published June 1999. Originally
published as D 732 – 43 T. Last previous edition D 732 – 93. 5.3 Micrometers—Suitable micrometers for measuring the
Annual Book of ASTM Standards, Vol 08.01.
thickness of the test specimen to an incremental discrimination
Annual Book of ASTM Standards, Vol 08.02.
of at least 0.025 mm (0.001 in.).
Annual Book of ASTM Standards, Vol 03.01.
Annual Book of ASTM Standards, Vol 14.02.
*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.
D 732
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 than when hardened tool steel is used. When they show signs of
appreciable wear, the shear tool can then be bored out to take either hardened or unhardened bushings, depending upon which are available.
Table of Metric Equivalents
1 1 3 1 1 1 7 1 1 1
in. ⁄8 ⁄4 ⁄8 ⁄2 0.984 0.999 1 1 ⁄8 1 ⁄2 1 ⁄8 2 2 ⁄8 3 3 ⁄4 4 4 ⁄8
mm 3.2 6.4 9.5 12.7 24.9 25.1 25.4 28 38 47 51 54 76 82 102 105
FIG. 1 Punch-Type Shear Tool for Testing Specimens 0.127 to 12.7 mm (0.050 to 0.500 in.) in Thickness
6. Test Specimen specimens in water vapor-impermeable containers as soon as
molded and not removing them until ready for testing.
6.1 The specimen shall consist of a 50-mm (2-in.) square or
7.2 Test Conditions—Conduct tests in the standard labora-
a 50-mm (2-in.) diameter disk cut from sheet material or
tory atmosphere of 23 6 2°C (73.4 6 3.6°F) and 50 6 5%
molded into this form. The thickness of the specimen may be
relative humidity, unless otherwise specified in the test method.
from 0.127 to 12.7 mm (0.050 to 0.500 in.). The upper and
In cases of disagreement, the tolerances shall be 61°C
lower surfaces shall be parallel to each other and reasonably
7 (61.8°F) and 62 % relative humidity.
flat. A hole approximately 11 mm ( ⁄16 in.) in diameter shall be
drilled through the specimen at its center.
8. Procedure
7. Conditioning
8.1 Use five specimens.
8.2 Measure the thickness of the test specimen with a
7.1 Conditioning—Condition the test specimens at 23 6
2°C (73.4 6 3.6°F) and 50 6 5 % relative humidity for not less suitable micrometer to the nearest 0.025 mm (0.001 in.) at
several points 12.7 mm (0.500 in.) from its center.
than 40 h prior to test in accordance with Procedure A of
Practice D 618, for those tests where conditioning is required. 8.3 Place the specimen over the 9.5-mm ( ⁄8-in.) pin of the
punch and fasten tightly to it by means of the washer and nut.
In cases of disagreement, the tolerances shall be 61°C
(61.8°F) and 62 % relative humidity. Then assemble the tool jig and tighten the bolts.
7.1.1 Note that for some hygroscopic materials, such as 8.4 Maintain the crosshead speed of the machine during the
nylons, the material specifications (for example, Specification test at 1.25 mm (0.05 in.)/min, measured when the machine is
D 4066)
...