可塑性
应变率
本构方程
材料科学
利维-米塞斯方程
屈服面
平面应力
莫尔-库仑理论
变形(气象学)
岩土工程
产量(工程)
机械
残余物
流动应力
剪切(地质)
复合材料
有限元法
结构工程
数学
强度因子
地质学
物理
工程类
断裂力学
算法
作者
A. M. P. Wedage,N. R. Morgenstern,Dave Chan
摘要
Plasticity theory is extended to incorporate strain rate effects on the residual shear strength of clays. The clay is assumed to behave elastically before yielding and then in a perfectly plastic manner with no volume change during yielding. The Mohr-Coulomb failure criterion is used in the rate-dependent model in which the strain rate affects the mobilized effective friction angle of the material. During initial yielding and subsequent plastic deformation, the stress and strain states at a point will satisfy the rate-dependent yield function (loading function). When the effective plastic strain rate decreases to a threshold strain value, the loading surface moves, or collapses, to the static yield surface. A constant volume flow rule is used to calculate plastic deformation. The computed stress-strain relationship is formulated in two parts, namely a rate-independent part and a rate-dependent part. The rate-independent part is the same as that used in classical elastoplastic formulations, whereas the rate-dependent part is dependent on the current strain rate of the material. The use of the model is illustrated using a numerical example simulating a two-dimensional plane strain test.Key words: constitutive relationship, finite element, plasticity theory, pre-sheared clay, rate effects, residual strength.
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