AN INVESTIGATION OF THE MECHANICAL-BEHAVIOR OF SCS-6 TI-6-4 METAL-MATRIX COMPOSITE AT ELEVATED-TEMPERATURES/

The orthotropic, non-linear stress/strain behavior of SCS-6/Ti-6-4 met al matrix composite at room temperature, 204-degrees-C and 316-degrees -C was investigated experimentally by testing off-axis coupon specimen s. A one-parameter plasticity model was used to describe this non-line ar behavior. In addition, a micromechanical model assuming elastic fib er and elastic-plastic matrix was used to estimate the fiber/matrix bo nd strength on the basis of the apparent yield stress obtained from th e off-axis test result. A failure criterion was also proposed from whi ch the inplane shear strength of the composite was obtained.