Failure Analysis of the Split-D Test Method

CE Knight

doi:10.1520/STP26944S

SYMPOSIA PAPER Published: 01 January 1977

STP26944S

Failure Analysis of the Split-D Test Method

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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.

Author Information

Knight, CE

Oak Ridge Y-12 Plant, Union Carbide Corporation, Oak Ridge, Tenn.

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Details

Developed by Committee: D30

Pages: 201–214

DOI: 10.1520/STP26944S

ISBN-EB: 978-0-8031-4690-7

ISBN-13: 978-0-8031-4490-3

Failure Analysis of the Split-D Test Method

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