圆盘和五边形局部加载堆积中的应力传播
Stress propagation in locally loaded packings of disks and pentagons
AI总结：
本研究通过光弹性实验比较圆盘和五边形颗粒堆积在局部加载下的应力传播，发现五边形在更低堆积分数下抵抗侵入且力链更少，并揭示了应力数据在重标度后的塌缩规律。
摘要：
颗粒材料的机械强度和流动可能强烈依赖于单个颗粒的形状。我们报告了在局部加载、准二维的圆盘或五边形颗粒堆积中进行的光弹性实验获得的定量结果，这些堆积表现出粘滑动力学。五边形堆积在显著低于圆盘堆积的堆积分数下就能抵抗侵入体，并且从侵入体向边界传递应力的空间范围更小。此外，五边形堆积中的回弯力链数量显著少于圆盘堆积。当根据稳态开放通道形成的堆积分数重新标度堆积分数时，应力的前向空间范围和回弯力链的数据发生塌缩，但侵入体力和动力学的数据不塌缩。我们评论了系统尺寸对这些发现的影响，并强调了与滑动事件期间圆盘和五边形动力学的联系。
英文摘要：
The mechanical strength and flow of granular materials can depend strongly on the shapes of individual grains. We report quantitative results obtained from photoelasticimetry experiments on locally loaded, quasi-two-dimensional granular packings of either disks or pentagons exhibiting stick-slip dynamics. Packings of pentagons resist the intruder at significantly lower packing fractions than packings of disks, transmitting stresses from the intruder to the boundaries over a smaller spatial extent. Moreover, packings of pentagons feature significantly fewer back-bending force chains than packings of disks. Data obtained on the forward spatial extent of stresses and back-bending force chains collapse when the packing fraction is rescaled according to the packing fraction of steady state open channel formation, though data on intruder forces and dynamics do not collapse. We comment on the influence of system size on these findings and highlight connections with the dynamics of the disks and pentagons during slip events.
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