ASTM D4255 tests the in-plane shear properties of high-modulus fiber-reinforced composite materials. In ASTM D4255 Procedure A, laminates clamped between two pairs of loading rails are tested. When loaded in tension the rails introduce shear forces in the specimen. In ASTM D4255 Procedure B, laminates clamped on opposite edges with a tensile or compressive load applied to a third pair of rails in the center are tested.

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