Published: Jan 1977
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The Split-D test is used to determine unidirectional tensile strength of filament wound composites, but it has a known stress concentration in the ring near the D edge. A finite element stress analysis and a statistical strength theory are used to assess the influence of the stress concentration on the ultimate strengths calculated for the composites from the Split-D test. Stress distributions are presented for the conventional Split-D ring as well as the elongated ring specimens. The influence of material variability via the Weibull parameter, m, on the predicted failure level is shown. In general, materials with an average variability (m < 40) will yield Split-D test results above 90 percent of the true strength.
composite materials, rings, tension tests, stress analysis, unidirectional strength, failure prediction
Development specialist, Oak Ridge Y-12 Plant, Union Carbide Corporation, Oak Ridge, Tenn.