抄録
Mori-Tanaka theory is used to predict average behaviors of yielding of composite materials and polycrystals. Comparison with experimental results quantitatively shows the characteristics of such an average yield stress. Results indicate the hydrostatic pressure dependence onto yielding and the anisotropy of yield loci. Furthermore a type of non-associativeness of the flow and a corner development on the yield loci of polycrystals are shown as an approximate example.
