Page 17 - Automotive Aerospace

ASTM D4255 / D4255
JIS K7079
In-Plane Shear Testing
The in-plane shear test jig is designed to test fiber-reinforced plastics. This test
method is generally called the two-rail method. The jig mechanism easily
generates in-plane shear on the sample to achieve stable test results.

ASTM D6641 / D6641M
Compression Testing and Evaluation of Polymer Matrix Composite
Laminate Using a Combined Loading Compression (CLC) Test Jig
Combined loading compression (CLC) testing uses a combination of shear loads
and end face loads. This method uses strip test samples with no tabs. It offers
the advantage of simultaneous strength and elastic-modulus measurements.
In this method, a strip sample is held vertically by pairs of upper and lower
blocks with their top and bottom faces aligned with the top and bottom ends of
the sample in order to directly compress the sample from its top end.

ASTM D6671/ D6671M

Evaluation of Interlaminar Fracture Toughness of CFRP Cross Laminate by MMB Testing
As CFRP composites are laminated for practical use, they have low interlaminar fracture
strength and interlaminar fracture toughness. Therefore, when the materials are subjected to
shock loads, delamination cracks readily form between the layers, which can become initiation
points for fracture. Generally, the crack-tip deformation modes are Mode I (open type), Mode
II (in-plane shear type), Mode III (out-of-plane shear type), or a combination of the three. As
delamination occurs due to a mixed deformation mode where Mode I and Mode II occur
simultaneously, it is important to evaluate the mixed-mode fracture toughness.
This jig is used for mixed-mode bending (MMB) testing by applying a combination of Mode I and Mode
II deformations to flat fiber-reinforced plastic materials to measure the fracture toughness values.

ASTM D2344 / D2344M
ASTM D790
ASTM D6272
ASTM D7264 / D7264M
ISO178ɹJIS K7171
Three- and Four-Point Bending Testing
The bending properties of plastics are important for numerous applications. Various
standards describe appropriate testing procedures. Three- or four-point bending testing is
used to measure the strength properties of comparatively rigid materials. For this type of
testing, it is recommended to directly measure the sample strain using deflection gauges
or other strain gauges. As the fulcrum span is determined according to the sample
thickness, it is important to know the range of sample dimensions before selecting the jig.

Testing and Evaluation Equipment
for the Aerospace Industry
Solutions for Aerospace Testing 17