異方硬化クリープ挙動の定式化 : 第2報,実験結果との比較

抄録

The main purpose of the present study is to evaluate the validity of the anisotropic creep model proposed in the prior report through comparison with experimental results. A comparison with the well-known anisotropic creep models proposed by Murakami-Ohno and Mroz-Trampczynski-Hayhurst is also made; we discuss the structural similarities and/or differences and the predictive capability of these anisotropic creep models. The proposed creep model has a framework of unified constitutive models and assumes an auxiliary hardening rule for creep analyses. The auxiliary rule is characterized by the concept of material memory surface in which the isotropic hardening is suppressed and at the same time the rate of anisotropic hardening is increased by the amount by which the isotropic hardening rate is reduced. The comparison with the experimental results shows an acceptable accuracy of the proposed model. With other creep models, the present model has a comparable accuracy.