Page 16 - Automotive Aerospace

Testing Compliant with Various CFRP Testing Standards

ASTM D6484 / D6484M
Open-Hole Compression Strength Testing on Polymer Matrix Composite Laminate
ASTM D6484 is a typical method used to determine the compressive strength of
CFRP open-hole samples. This is a shear-force method that applies a force in the
longitudinal direction to both sides of the sample to determine the compressive
strength of the holes.
On the other hand, the method prescribed in JIS K7093 is an end-load method
that directly applies compression forces to the ends of the sample to determine
its compressive strength. It is known to provide results equivalent to those
obtained by the ASTM D6484 method, while using smaller samples and jigs.

ASTM D7137 / D7137M

Testing the Compressive Residual Strength Characteristics of
a Damaged Polymer Matrix Composite Plate
Compression testing according to ASTM D7137 / D7137M is intended for samples damaged
by impact testing. The impact testing is prescribed in ASTM D7136. This jig was developed by
the Boeing Company. The testing is performed on rectangular samples made of composite
material that have already been subjected to impact testing. The sample is mounted on the
jig and subjected to compression loads. The load at fracture is then compared to the
compression strength it exhibits when no impact force has been applied, so that the residual
strength of the sample can be determined. Determining the damage resistance of layered
composite plates is useful for product development and material selection.

ASTM D5379 / D5379M
JIS K7079-2
In-Plane Shear Testing—Double-V-Notched Sample Shearing
The in-plane shear strength, in-plane shear fracture strain, and in-plane shear
elastic modulus of carbon-fiber-reinforced plastics can be determined by the
Iosipescu test, which is an in-plane shear test on double-V-notched samples. This
testing method is applicable to unidirectional (UD) materials and laminates
comprising unidirectional reinforcing layers or textile reinforcing layers (cross
laminates, quasi-isotropic laminates, etc.).

ASTM D7078 / D7078M
V-Notched Rail Shear Testing and Evaluation of Composites
This testing applies shear forces to mounted samples with 90-degree V-notches
at the top and bottom. In ASTM D5379, loads are applied to the top and
bottom ends of the sample, while in ASTM D7078, the surfaces are grasped to
apply higher shear loads. It permits testing of larger samples than those
specified by ASTM D5379.

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