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ASTM D 4255/D 4255M Document Information:
Title
Standard Test Method for In-Plane Shear Properties of Polymer Matrix Composite Materials by the Rail Shear Method
ASTM International
Publication Date:
Oct 10, 2001
Scope:
This test method determines the in-plane shear properties of
high-modulus fiber-reinforced composite materials by either of two
procedures. In Procedure A, laminates clamped between two pairs of
loading rails are tested. When loaded in tension the rails
introduce shear forces in the specimen. In Procedure B, laminates
clamped on opposite edges with a tensile or compressive load
applied to a third pair of rails in the center are tested.
Application of this test method is limited to continuous-fiber
or discontinuous-fiber-reinforced polymer matrix composites in the
following material forms:
Laminates composed only of unidirectional fibrous laminae, with
the fiber direction oriented either parallel or perpendicular to
the fixture rails.
Laminates composed only of woven fabric filamentary laminae with
the warp direction oriented either parallel or perpendicular to the
fixture rails.
Laminates of balanced and symmetric construction, with the 0°
direction oriented either parallel or perpendicular to the fixture
rails.
Short-fiber-reinforced composites with a majority of the fibers
being randomly distributed.
NOTE 1—Additional test methods for determining in-plane shear
properties of polymer matrix composites may be found in Test
Methods D 5379/D 5379M and D 5448/D 5448M, and Practice D 3518/D
3518M.
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.
The values stated in either SI units or inch-pound units are to
be regarded separately as standard. Within the text the inch-pounds
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.
Keywords:
- composite materials
- shear modulus of elasticity
- shear properties
- shear strength
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