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Stress partition analysis of granular materials

机译:颗粒材料的应力分配分析

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Writing the stress as a sum over contact forces allows one to partition stress increments according to their microscopic, grain-level causes. We present two ways of doing this: the first way differentiates between normal and tangential contact forces, while the second ascribes different parts of a change in stress to different physical processes such as contact network anisotropy, non-affine motions and sliding contacts. These two partitioning methods can be combined. We then use them to analyze simulations of failure in biaxial tests, leading to several results. We show that the granular material becomes effectively frictionless well before failure. In addition, by partitioning the second order work, one can attribute a part of the destabilization to each of the various physical processes mentioned above.
机译:将应力写成接触力的总和,可以使应力增量根据其微观,晶粒级原因进行划分。我们提出了两种方法:第一种方法区分法向和切向接触力,第二种方法将应力变化的不同部分归因于不同的物理过程,例如接触网络各向异性,非仿射运动和滑动接触。这两种分区方法可以组合使用。然后,我们使用它们来分析双轴测试中的失效模拟,从而得出若干结果。我们表明,粒状材料在失效之前就变得有效地无摩擦。另外,通过划分二阶工作,可以将不稳定的一部分归因于上述各种物理过程中的每一个。

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