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ASTM D 7137/D 7137M Document Information:
Title
Standard Test Method for Compressive Residual Strength Properties of Damaged Polymer Matrix Composite Plates
ASTM International
Publication Date:
Nov 15, 2007
Scope:
This test method covers compression residual strength properties
of multidirectional polymer matrix composite laminated plates,
which have been subjected to quasi-static indentation per Test
Method D 6264/D 6264M or drop-weight impact per Test Method D
7136/D 7136M prior to application of compressive force. The
composite material forms are limited to continuous-fiber reinforced
polymer matrix composites with multidirectional fiber orientations,
and which are both symmetric and balanced with respect to the test
direction. The range of acceptable test laminates and thicknesses
is defined in 8.2.
NOTE 1—When used to determine the residual strength of
drop-weight impacted plates, this test method is commonly referred
to as the Compression After Impact, or CAI, method.
The method utilizes a flat, rectangular composite plate,
previously subjected to a damaging event, which is tested under
compressive loading using a stabilization fixture.
NOTE 2—The damage tolerance properties obtained are particular
to the type, geometry and location of damage inflicted upon the
plate.
The properties generated by this test method are highly
dependent upon several factors, which include specimen geometry,
layup, damage type, damage size, damage location, and boundary
conditions. Thus, results are generally not scalable to other
configurations, and are particular to the combination of geometric
and physical conditions tested.
This test method can be used to test undamaged polymer matrix
composite plates, but historically such tests have demonstrated a
relatively high incidence of undesirable failure modes (such as end
crushing). Test Method D 6641/D 6641M is recommended for obtaining
compressive properties of undamaged polymer matrix composites.
The values stated in either SI units or inch-pound units are to
be regarded separately as standard. Within the text 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:
- composite materials
- compression after impact
- compression testing
- compressive residual strength
- damage
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