SA-11-2(026) Multiaxial Inelastic Deformation at High Temperature and Constitutive Modeling Based on Viscoplasticity Theory(Inelastic Modeling & Analysis 1)

概要

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Inelastic deformation of 316FR stainless steel under biaxial ratcheting and nonproportional loading at high temperature is discussed based on viscoplasticity theory. It is pointed out that the multiaxial ratcheting can be regarded as a special case of nonproportional loading and that the simultaneous modeling of the both behaviors is inevitable. In the one of the authors' previous study a uniaxial viscoplastic constitutive equation was developed based on the viscoplasticity theory proposed by Krempl. An idea similar to Ohno-Wang model for ratcheting is employed to extend this previous model and a viscoplastic constitutive model is developed for biaxial ratcheting and nonproportional loading. A critical value is assumed for the dynamic recovery of the kinematic stress. It is also assumed that the activating the dynamic recovery of the kinematic stress reduces the additional hardening under nonproportional loading. It is shown that the developed model well reproduces both biaxial ratcheting and stress response under nonproportional loading.
一般社団法人日本機械学会の論文
2001-06-03