Why is a rectangular specimen required instead of a dog bone specimen such as the ones used for metals? When performing tensile tests, usually a dog bone specimen is required. However, when performing the same tensile test for composite materials, such as continuous and highly aligned fiber-reinforced composites, the ASTM3039 standard calls for a rectangular specimen instead.

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There are a few reasons why a rectangular specimen is required instead of a dog bone specimen for tensile testing of composite materials Dog bone spec... View the full answer