Abstract
The cruciform-type specimen is preferable to cylindrical-type one to perform biaxial tensile test. Therefore, a cruciform-type specimen having some slots in four arms was used to determine biaxial property of carbon-carbon (C/C) composites. The strain (or stress) distribution in center area and the stress state of the specimen having several kinds of slots, which differ in the length, width, position and number, were calculated by finite element analysis. As the result, geometry of a cruciform-type specimen was selected as the most suitable one for biaxial tensile test of C/C composites. The strains in center area of the proposed specimen under biaxial tensile loads were measured by strain gauges, and the values agreed well with those of analytical results. Therefore, the validity of the geometry of the cruciform-type specimen was experimentally confirmed. Also the behaviors of C/C composites under biaxial tensile loads were examined on this type of specimen. (orig.) 6 refs.
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