ASTM D5766 determines the open-hole tensile strength of multidirectional composite coupons. The composite coupon geometry has to be in accordance with test method ASTM D3039. ASTM D5766 is designed to produce tensile results on multidirectional polymer matrix composite laminates mainly used in the aerospace industry for material specifications, research and development, quality assurance, and structural design and analysis.

Materials Testing System

Because the forces required for ASTM D5766 testing are relatively high, a floor model universal testing system such as Kason's Electronic  Series is recommended. The properties of composite materials are highly directional, making it especially necessary to test with a system that is well-aligned and repeatable. An AlignPRO fixture and precision manual or hydraulic wedge grips are necessary in order to test specimens within alignment requirements and without slippage.