修正移動硬化クリープ構成モデルの物理的解釈

概要

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A physical-metallurgical interpretation of the modified kinematic hardening (MKH) model presented in the previous studies is discussed in detail. Physically based expressions which are equivalent to the phenomenological MKH model are also given. First of all, we examined the relationship between the apparent stress exponent (b) and the effective one (m) which is predicted by the MKH model, and compared it with the reported results. As a result, the physical-metallurgical observations that b>m and the magnitude of the internal stress in the steady state is proportional to the applied stress were not predicted simultaneously by the present model. If b=m, however, the proportional relation was satisfied. Second, using the relationship between the internal stress and the dislocation density, we constructed a physically based constitutive model. The structure of the derived model was slightly more general than the multiaxial version of Lagneborg's dislocation-density model. Finally, incorporation of an anisotropic aspect into this dislocation-density-based constitutive structure was discussed.
一般社団法人日本機械学会の論文
1993-07-25