ASTM D4255 / D4255M – 15a : Standard Test Method for In-Plane Shear Properties of Polymer Matrix Composite Materials by the Rail Shear Method
These shear tests are designed to produce in-plane shear property data for material specifications, research and development, and design.
Factors that influence the shear response and should therefore be reported include: material, methods of material preparation and lay-up, specimen stacking sequence, specimen preparation, specimen conditioning, environment of testing, specimen alignment and gripping, speed of testing, time at temperature, void content, and fiber volume reinforcement content.
Properties that may be measured by this test method include:
In-plane shear stress versus engineering shear strain response,
In-plane shear chord modulus of elasticity,
Offset shear stress, and
Maximum in-plane shear stress. In cases in which the engineering shear strain at failure is greater than 5 %, the shear stress corresponding to 5 % engineering shear strain should be reported.
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