Rolling resistance at contacts in simulation of shear band development by DEM
Rolling resistance at contacts in simulation of shear band development by DEM
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DOI：
10.1061/(asce)0733-9399(1998)124:3(285
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发表时间：
1998-03-01
期刊：
影响因子：
--
通讯作者：
Oda, M
中科院分区：
文献类型：
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作者：
Iwashita, K;Oda, M
为了对剪切带的微观结构进行数值模拟，对离散元方法进行了改进，以便能够考虑接触处的滚动阻力效应。为此，滚动引起的相对运动与具有共同接触的两个颗粒之间的相对旋转相关联，这使得在比通过接触传递力矩更普遍的情况下推广角动量守恒定律成为可能。当考虑接触处的滚动阻力时，不仅可以重现剪切带内部大孔隙的产生，还可以重现沿剪切带边界的颗粒旋转的高梯度，这与天然粒状土的情况非常相似。柱体的形成是应变硬化过程中出现的一个常见特征，柱体的屈曲与剪切带的发展是并行的。大孔隙的产生和颗粒旋转的高梯度是柱体屈曲的结果。
To simulate numerically the microstructure of shear bands, the distinct element method was modified such that the effect of rolling resistance at contacts could be taken into account. To this end, the relative movement by rolling is related to the relative rotation between two particles with a common contact, which makes it possible to generalize the conservation law of angular momentum for a more general case than the moments can be transmitted through contacts. Not only the generation of large voids inside a shear band but also the high gradient of particle rotation along the shear band boundaries can be reproduced, in a manner quite similar to those of natural granular soils, when the rolling resistance at contacts is considered. The development of columns is a common feature that appears in the strain hardening process, and buckling of the columns parallels the development of shear bands. The generation of large voids and the high gradient of particle rotation are produced as a result of the buckling of the columns.