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ASTM D 7136/D 7136M Document Information:
Title
Standard Test Method for Measuring the Damage Resistance of a Fiber-Reinforced Polymer Matrix Composite to a Drop-Weight Impact Event
ASTM International
Publication Date:
Oct 1, 2007
Scope:
This test method determines the damage resistance of
multidirectional polymer matrix composite laminated plates
subjected to a drop-weight impact event. The composite material
forms are limited to continuous-fiber reinforced polymer matrix
composites, with the range of acceptable test laminates and
thicknesses defined in 8.2.
A flat, rectangular composite plate is subjected to an
out-of-plane, concentrated impact using a drop-weight device with a
hemispherical impactor. The potential energy of the drop-weight, as
defined by the mass and drop height of the impactor, is specified
prior to test. Equipment and procedures are provided for optional
measurement of contact force and velocity during the impact event.
The damage resistance is quantified in terms of the resulting size
and type of damage in the specimen.
The test method may be used to screen materials for damage
resistance, or to inflict damage into a specimen for subsequent
damage tolerance testing. When the impacted plate is tested in
accordance with Test Method D 7137/D 7137M, the overall test
sequence is commonly referred to as the Compression After Impact
(CAI) method. Quasi-static indentation per Test Method D 6264 may
be used as an alternate method of creating damage from an
out-of-plane force and measuring damage resistance properties.
The damage resistance properties generated by this test method
are highly dependent upon several factors, which include specimen
geometry, layup, impactor geometry, impactor mass, impact force,
impact energy, and boundary conditions. Thus, results are generally
not scalable to other configurations, and are particular to the
combination of geometric and physical conditions tested.
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
- damage resistance
- drop-weight impact
- impact testing
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