论文标题
内聚力引起的摩擦削弱：粘性颗粒失败的数值病例
Frictional weakening induced by cohesion: the numerical case of cohesive granular failures
论文作者
论文摘要
重力下方的2D数值粘性颗粒台阶的失败被模拟了大量内聚力。专注于晶粒的累积位移，并定义位移阈值，我们建立了一个明智的标准来捕获失败特征。我们能够在时间上定位失败并确定不稳定的不同阶段。我们发现，由于内聚力的增加，失败的开始延迟了，但其持续时间变短。定义一个狭窄的位移间隔，明确定义的剪切带揭示了故障。解决故障块的平衡，我们能够成功预测故障角和凝聚力之间的依赖性，从而披露了两种不同的摩擦行为：虽然摩擦在较小的凝聚力下保持恒定，但在较大凝聚力下的粘性特性会显着降低。因此，结果揭示了有两个方案的凝聚力颗粒物的行为，具体取决于凝聚力强度，揭示了凝聚力诱导的弱化机制。
The failure of 2D numerical cohesive granular steps collapsing under gravity are simulated for a large range of cohesion. Focussing on the cumulative displacement of the grains, and defining a displacement threshold, we establish a sensible criterion for capturing the failure characteristics. We are able to locate the failure in time and to identify the different stages of the destabilisation. We find that the onset of the failure is delayed by increasing cohesion, but its duration becomes shorter. Defining a narrow displacement interval, a well-defined shear band revealing the failure comes out. Solving the equilibrium of the failing block, we are able to make successful predictions for the dependance between failure angle and cohesion, thereby disclosing two distinct frictional behaviour: while friction remains constant at small cohesion, it significantly decreases with cohesive properties at larger cohesion. The results hence reveal two regimes for the behaviour of cohesive granular matter depending on cohesion strength, revealing a cohesion-induced weakening mechanism.
