THERMO ELASTO—PLASTIC OPTIMUM DESIGN OF CERAMIC—METAL FUNCTIONALLY GRADED MATERIALS-I.MICROMECHANICAL AND GEOMETRICAL EFFECTS
摘要
The thermo elasto-plastic optimum design ofceramic-metal functionally graded materials (FGMs) wasinvestigated in this paper. The inelastic properties were firstevaluated using micromechanical approaches, then an elasto-plastic finite element model was used to calculate the thermalstress in the material. The effects of micromechanical ap-proaches, plasticity and graded interlayer thickness on thethermal stress relaxation characteristics and stress distribu-tions were studied. The results show that: (1) the macro elas-to-plastic response given by the mean-field micromechanicsand self-consistent micromechanics is nearly the same but theresponse given by the rule of mixture is different; (2)the ther-mo elasto-plastic behavior must be considered to realisticallyevaluate stress reduction, and the elasto-plastic optimum de-sign can get helpful information to determine the graded in-terlayer thicknesses; and(3) to optimize the microstructure ofthe graded material achieves reductions in critical stress com-ponent