STEADY-STATE POWER-LAW CREEP IN INCLUSION MATRIX COMPOSITE-MATERIALS

This work is devoted to the prediction of the constitutive steady-stat e creep behavior of matrix inclusion composites. Both phases are chara cterized by power-law constitutive equations. The three phase model is extended to viscoplastic equations. If both phases have the same stra in rate sensitivity, the effective behavior of the composite is charac terized by an effective prefactor. If not, an effective strain rate se nsitivity is defined, which is a function of the applied strain rate a nd of the volume fraction of the phases. All the results are compared with the classical self-consistent ones. A limit case which may be rel ated to the grain boundary sliding accommodated by intragranular power -law creep is also studied.