Computational study of transient shear banding in soft jammed solids.,Physical Review E

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Computational study of transient shear banding in soft jammed solids.
Physical Review E ( IF 2.2 ) Pub Date : 2020-07-06 , DOI: 10.1103/physreve.102.012603
Vishwas V Vasisht _{1,

2} , Emanuela Del Gado ₂

Affiliation

We have designed three-dimensional numerical simulations of a soft spheres model, with size polidispersity and in athermal conditions, to study the transient shear banding that occurs during yielding of jammed soft solids. We analyze the effects of different types of drag coefficients used in the simulations and compare the results obtained using Lees-Edwards periodic boundary conditions with the case in which the same model solid is confined between two walls. The specific damping mechanism and the different boundary conditions indeed modify the load curves and the velocity profiles in the transient regime. Nevertheless, we find that the presence of a stress overshoot and of a related transient banding phenomenon, for large enough samples, is a robust feature for overdamped systems, where their presence do not depend on the specific drag used and on the different boundary conditions.

中文翻译：

软堵塞固体中瞬时剪切带的计算研究。

我们设计了具有大小分布和在无热条件下的软球模型的三维数值模拟，以研究在堵塞的软固体屈服过程中发生的瞬时剪切带。我们分析了模拟中使用的不同类型的阻力系数的影响，并比较了使用Lees-Edwards周期性边界条件和将相同模型实体限制在两壁之间的情况下的结果。具体的阻尼机制和不同的边界条件确实会改变瞬态状态下的载荷曲线和速度曲线。不过，我们发现，对于足够大的样本，应力过冲和相关的瞬态带状现象的存在对于过阻尼的系统来说是一个强大的功能，

更新日期：2020-07-06

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