非比例負荷繰返しによる塑性変形 : 第1報, 履歴曲線の一記述法

概要

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Thin-walled tubes of a carbon steel were subjected to nonproportional cyclic loading. A new expression for describing the cyclic deformation under multiaxial stresses was demonstrated for examining the propriety of the constitutive equation in cyclic plasticity presented in a previous paper, based on the random barriers theory. With this expression, the cyclic deformation, both under the proportional loading and under the nonproportional loading, could be discussed inclusively in the same category. The experimental results proved that the plastic potential function used in the equation and its change characteristics depending on the cyclic history, induced from the experiments on the uniaxial stress cycling, were applicable to the case of the multiaxial stress cycling. Moreover, it was suggested that an effect of anisotropy produced by cyclic deformation might be reflected in the internal structure variable which was one of the fundamental components in the constitutive equation.
1989-03-25