機械構造用鋼の応力-ひずみヒステリシス・ループと繰返し応力-ひずみ曲線に関する結晶塑性的解析 : 第1報, 解析方法と二,三の解析結果

概要

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Cyclic internal stress was determined through a strain rate change test, and cyclic hardening and softening properties were measured during low cycle fatigue tests on structural steels greatly different in strength and ductility levels. The internal stress and the mechanical quantities on cyclic deformation were empirically formulated as functions of the yield stress and the work hardening exponent in a static tension, and the dislocation density. These formulated quantities were introduced into the Johnston-Gilman's equation modified by the authors, in which the macroscopic plastic strain rate was correlated with the dislocation motion. Then, the stress-strain hysteresis loops and the cyclic stress-strain response of the structural steels for machine components were analyzed in terms of dislocation dynamics. The analyses were in quite good agreement with the present test results. Consequently, it was shown that the cyclic stress-strain response of the steels could be analytically determined using the static mechanical properties.
一般社団法人日本機械学会の論文
1986-08-25