損傷の履歴依存性と連成を考慮した非弾性構成モデル

概要

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A multiaxial constitutive model to describe the history-dependent creep deformation and damage of polycrystalline metallic materials under variable loading conditions has been developed. A particular emphasis is placed on a novel modeling of the history-dependent material degradation coupled with creep hardening mechanisms. First, the history dependence of internal variables involved in the kinematic-hardening model is identified. Then, continuum damage variables coupled with different history-dependent hardening variables are newly defined, and the total damage is expressed as the sum of these damage variables. This inelastic-history dependent damage model is incorporated into the modified kinematic hardening model which has been developed to predict the complicated anisotropic hardening/softening behavior under repeated multiaxial stress changes. Finally, the characteristic of the proposed model with respect to the history-dependent growth of damage is elucidated through numerical analyses for different material parameters. The present damage-coupled modified kinematic hardening model can describe the accelerated or decelerated accumulation of creep damage depending on stress variations, together with the transient material-softening behavior.
一般社団法人日本機械学会の論文
1999-05-25