動的回復の臨界状態を考慮した移動硬化則 : 第1報, 定式化およぴ基本的特徴

抄録

A kinematic hardening rule formulated in a hardening/dynamic recovery format is examined for simulating ratchetting behavior. This rule, characterized by decomposition of the kinematic hardening variable into components, is based on the assumption that each component has a critical state for its dynamic recovery to be actived. Discussing basic features of the rule, we show that it can predict much less accumulation of uniaxial and multiaxial ratchetting strains than the Armstrong and Frederick rule. Comparisons with classical models such as the multilayer and multisurface models are also made, resulting in a finding that the present rule is similar to the multilayer model with total strain rate replaced by inelastic strain rate. A companion paper deals with applications to the experiments of Modified 9Cr-1Mo steel at 550°C.