ASTM D3846 covers the determination of the in-plane shear strength of reinforced thermosetting plastics in flat sheet form in thicknesses ranging from 2.54 to 6.60 mm. Shear tests of various kinds are widely used in the reinforced plastics industry to assess the strength of the reinforcement-to-resin bond in polyester-, vinyl ester-, and epoxy-resin composites. ASTM D3846 is useful for establishing the shear strength of laminates or other reinforced plastics having randomly dispersed fiber reinforcement. ASTM D3846 is similar to ASTM D695, Test Method for Compressive Properties of Rigid Plastics, except that failure of the specimen occurs in shear between two centrally located notches that are machined halfway through the thickness of the specimen and spaced a fixed distance apart on opposing faces.

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