粘塑性理論の高温非弾性解析への適用 : 温度変動下の変形挙動解析と寿命評価

概要

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A unified constitutive model and a continuous damage law are applied to analyze the deformation and life-time on 21/4 Cr-1Mo steel under time-varying temperature. The extended viscoplasticity model and the incremental life prediction law are employed and their material constants are determined at the temperature of 25℃ to 600℃. Creep, tensile and cyclic loading tests are carried out under various temperature histories. The responses to sudden changes of temperature in the tensile tests are rather similar to those observed previously in the strain rate change tests. The viscoplasticity model is shown to reproduce the inelastic stress-strain behavior in the experiment, and its coupling with the damage model simulates the creep-fatigue damage accumulation of cyclic thermal fatigue tests.
一般社団法人日本機械学会の論文
1987-09-25