在3D粒状介质中对力链的动态成像
Wei Li1,2, Ruben Juanes1
1Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139.
概括
粒状介质力学揭示了粒子形状如何影响力链. 角形粒子形成弹性网络,防止剪切故障,与曲力链的圆形粒子不同.
科学领域:
- 物理 物理学 物理
- 地质物理学 地质物理学
- 材料科学 材料科学 材料科学
背景情况:
- 颗粒介质无处不在,在颗粒力学中,通过颗粒接触 (力链) 了解力传递至关重要.
- 在压力下这些力链的空间结构和演变是基本的研究领域.
研究的目的:
- 介绍一种新的实验技术,用于在颗粒包装中可视化三维 (3D) 力量链.
- 研究粒子形状对三轴切削负荷下的力链形成和稳定性的影响.
主要方法:
- 开发并应用了干扰光学投射断层扫描.
- 在三轴切削负荷下研究了随机组合的球体和icosahedra.
主要成果:
- 球形粒子包表现出加剧的垂直力链.
- 图形形状的粒子包形成了更多相互连接的力链网络.
- 与球形粒子中的力链相比,角形粒子网络对拓崩具有更强的弹性.
结论:
- 粒子角性通过创建强大,相互连接的力链网络来增强对剪切故障的抵抗力.
- 圆形粒子中孤立的,较少分支的力链容易曲,导致宏观失效.
- 这项研究提供了对3D颗粒介质局部故障的粒度理解,这与山体滑坡和地震有关.
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