New development of the multiple strata plasticity model

The multiple strata plasticity model, which was presented in the previous p aper by introducing the tensor Q expressing the activating state of slip sy stems in the polycrystalline metal, has been developed with a new internal state factor B-5. This factor B-5 denotes the ratio of the grains with acti vating slip systems greater than five to the total grains. The variation fe atures of B-5 and Q can be computationally evaluated with a virtual polycry stalline specimen. The microstructure state, such as dislocation density ca n be reflected in the internal structure variable A in this model. The rela tionship between B-5 and A has been examined on the tensile flow curve of p ure copper. As a result, a simple formula connecting A with B-5 was determi ned. Moreover, it has been clarified that this formula is applicable for de scribing the plastic deformations under other proportional loadings.