ASTM D 6641/D 6641M Standard Test Method for Determining the Compressive Properties of Polymer Matrix Composite Laminates Using a Combined Loading Compression (CLC) Test Fixture
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ASTM D 6641/D 6641M Document Information:
Title
Standard Test Method for Determining the Compressive Properties of Polymer Matrix Composite Laminates Using a Combined Loading Compression (CLC) Test Fixture
ASTM International
Publication Date:
Mar 10, 2001
Scope:
This test method establishes a procedure for determining the
compressive strength and stiffness
properties of polymer matrix composite materials using a combined
loading compression (CLC)
(1)² or comparable test fixture. This test method is applicable
to general flat laminates that
are balanced and symmetric and contain at least one 0" ply. The
standard specimen is untabbed, and,
thus, for strength determination, the laminate is limited to a maximum
of 50 % 0" plies, or
equivalent (see 6.4).
The compressive force is introduced into the specimen by combined end-
and shear- loading. In
comparison, Test Method D 3410/D 3410M is a pure shear-loading
compression test method and Test
Method D 695 is a pure end-loading test method.
Unidirectional (0° ply orientation) composites can be tested to
determine unidirectional
composite modulus and Poisson's ratio, but not compressive strength.
The values stated in either SI units or inch-pound units are to be
regarded separately as standard.
Within the test the inch-pound units are shown in brackets. The values
stated in each system are
not exact equivalents; therefore, each system must be used
independently of the other. Combining
values from the two systems may result in nonconformance with the
standard.
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.
Keywords:
- combined loading
- composite materials
- compressive modulus of elasticity
- compressive properties
- compressive strength
- Poisson's ratio
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