ASTM D1621-00
(Test Method)Standard Test Method for Compressive Properties Of Rigid Cellular Plastics
Standard Test Method for Compressive Properties Of Rigid Cellular Plastics
SCOPE
1.1 This test method describes a procedure for determining the compressive properties of rigid cellular materials, particularly expanded plastics, based on test machine crosshead motion.
1.2 The values stated in SI units are to be regarded as the standard. The values 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-This test method and ISO 844 are technically equivalent.
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Designation: D 1621 – 00
Standard Test Method for
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Compressive Properties Of Rigid Cellular Plastics
This standard is issued under the fixed designation D 1621; 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 * 3.1.2 compressive strain—the dimensionless ratio of com-
pressive deformation to the gage length of the test specimen or
1.1 This test method describes a procedure for determining
the change in length per unit of original length along the
the compressive properties of rigid cellular materials, particu-
longitudinal axis.
larly expanded plastics, based on test machine crosshead
3.1.3 compressive strength—the stress at the yield point if a
motion.
yield point occurs before 10 % deformation (as in Fig. 1a) or,
1.2 The values stated in SI units are to be regarded as the
in the absence of such a yield point, the stress at 10 %
standard. The values in parentheses are for information only.
deformation (as in Fig. 1b).
1.3 This standard does not purport to address all of the
3.1.4 compressive stress (nominal)—the compressive load
safety concerns, if any, associated with its use. It is the
per unit area of minimum original cross section within the gage
responsibility of the user of this standard to establish appro-
boundaries, carried by the test specimen at any given moment,
priate safety and health practices and determine the applica-
expressed in force per unit area.
bility of regulatory limitations prior to use.
3.1.5 compressive stress-strain diagram—a diagram in
NOTE 1—This test method and ISO 844 are technically equivalent.
which values of compressive stress are plotted as ordinates
against corresponding values of compressive strain as abscis-
2. Referenced Documents
sas.
2.1 ASTM Standards:
3.1.6 compressive yield point—the first point on the stress-
D 618 Practice for Conditioning Plastics and Electrical
strain diagram at which an increase in strain occurs without an
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Insulating Materials for Testing
increase in stress.
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E 4 Practices for Force Verification of Testing Machines
3.1.7 deflection—crosshead movement after the loading
E 691 Practice for Conducting an Interlaboratory Study to
plates contact the specimen, expressed in millimetres or inches.
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Determine the Precision of a Test Method
3.1.8 gage length—the measured thickness of the test speci-
2.2 ISO Standard:
men expressed in units of length.
ISO 844 Cellular Plastics—Compression Test of Rigid Ma-
3.1.9 modulus of elasticity—the ratio of stress (nominal) to
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terials
corresponding strain below the proportional limit of a material
expressed in force per unit area based on the minimum initial
3. Terminology
cross-sectional area.
3.1 Definitions:
3.1.10 proportional limit—the greatest stress that a material
3.1.1 compressive deformation—the decrease in length pro-
is capable of sustaining without any deviation from propor-
duced in the gage length of the test specimen by a compressive
tionality of stress-to-strain (Hooke’s law) expressed in force
load expressed in units of length.
per unit area.
4. Significance and Use
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This test method is under the jurisdiction of ASTM Committee D-20 on Plastics
4.1 This test method provides information regarding the
and is the direct responsibility of Subcommittee D20.22 on Cellular Plastics.
behavior of cellular materials under compressive loads. Defor-
Current edition approved Jan. 10, 2000. Published April 2000. Originally
mation data can be obtained, and from a complete load-
published as D 1621 – 59 T. Last previous edition D 1621 – 94.
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Annual Book of ASTM Standards, Vol 08.01.
deformation curve it is possible to compute the compressive
3
Annual Book of ASTM Standards, Vol 03.01.
stress at any load (such as compressive stress at proportional-
4
Annual Book of ASTM Standards, Vol 14.02.
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limit load or compressive strength at maximum load) and to
Available from American National Standards Institute, 11 W. 42nd St., 13th
Floor, New York, NY 10036. compute the effective modulus of elasticity.
*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.
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D 1621
X = 10 % CORE DEFORMATION
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X = DEFLECTION (APPROXIMATELY 13 %)
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FIG. 1 a Compressive Strength (See 3.1.3 and Section 9) FIG. 1 b Compressive Strength (See 3.1.3 and Section 9)
of moduli of elasticity having considerable variation, and to values
4.2 Compression tests prov
...
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