ASTM D695-02

Designation:D695–02
Standard Test Method for
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Compressive Properties of Rigid Plastics
This standard is issued under the fixed designation D 695; 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.
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1. Scope Determine the Precision of a Test Method
1.1 This test method covers the determination of the me-
3. Terminology
chanical properties of unreinforced and reinforced rigid plas-
3.1 Definitions:
tics, including high-modulus composites, when loaded in
3.1.1 compressive deformation—the decrease in length pro-
compression at relatively low uniform rates of straining or
duced in the gage length of the test specimen by a compressive
loading. Test specimens of standard shape are employed.
load. It is expressed in units of length.
1.2 The values stated in SI units are to be regarded as the
3.1.2 compressive strain—the ratio of compressive defor-
standard. The values in parentheses are for information only.
mation to the gage length of the test specimen, that is, the
NOTE 1—For compressive properties of resin-matrix composites rein-
change in length per unit of original length along the longitu-
forced with oriented continuous, discontinuous, or cross-ply reinforce-
dinal axis. It is expressed as a dimensionless ratio.
ments, tests may be made in accordance with Test Method D 3410.
3.1.3 compressive strength—the maximum compressive
1.3 This standard does not purport to address all of the
stress (nominal) carried by a test specimen during a compres-
safety concerns, if any, associated with its use. It is the
sion test. It may or may not be the compressive stress
responsibility of the user of this standard to establish appro-
(nominal) carried by the specimen at the moment of rupture.
priate safety and health practices and determine the applica-
3.1.4 compressive strength at failure (nominal)—the com-
bility of regulatory limitations prior to use. A specific precau-
pressive stress (nominal) sustained at the moment of failure of
tionary statement is given in Note 11.
the test specimen if shattering occurs.
3.1.5 compressive stress (nominal)—the compressive load
NOTE 2—This test method is technically equivalent to ISO 604.
perunitareaofminimumoriginalcrosssectionwithinthegage
2. Referenced Documents
boundaries, carried by the test specimen at any given moment.
It is expressed in force per unit area.
2.1 ASTM Standards:
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3.1.5.1 Discussion—The expression of compressive proper-
D 618 Practice for Conditioning Plastics for Testing
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ties in terms of the minimum original cross section is almost
D 638 Test Method for Tensile Properties of Plastics
universally used. Under some circumstances the compressive
D 3410 Test Method for Compressive Properties of Poly-
properties have been expressed per unit of prevailing cross
mer Matrix Composite Materials with Unsupported Gage
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section. These properties are called “true” compressive prop-
Section by Shear Loading
erties.
D 4000 Classification System for Specifying Plastic Mate-
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3.1.6 compressive stress-strain diagram—a diagram in
rials
which values of compressive stress are plotted as ordinates
D 4066 Specification for Nylon Injection and Extrusion
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against corresponding values of compressive strain as abscis-
Materials
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sas.
E 4 Practices for Force Verification of Testing Machines
3.1.7 compressive yield point—the first point on the stress-
E 83 Practice for Verification and Classification of Exten-
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strain diagram at which an increase in strain occurs without an
someters
increase in stress.
E 691 Practice for Conducting an Interlaboratory Study to
3.1.8 compressive yield strength—normally the stress at the
yield point (see also section 3.113.1.11).
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3.1.9 crushing load—the maximum compressive force ap-
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
and is the direct responsibility of Subcommittee D20.10 on Mechanical Properties.
plied to the specimen, under the conditions of testing, that
Current edition approved April 10, 2002. Published June 2002. Originally
produces a designated degree of failure.
published as D 695 – 42 T. Last previous edition D 695 – 96.
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Annual Book of ASTM Standards, Vol 08.01.
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Annual Book of ASTM Standards, Vol 15.03.
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Annual Book of ASTM Standards, Vol 08.02.
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Annual Book of ASTM Standards, Vol 03.01. Annual Book of ASTM Standards, Vol 14.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D695–02
3.1.10 modulus of elasticity—the ratio of stress (nominal) to take precedence over those mentioned in this test method. If
corresponding strain below the proportion
...