测量在三维无摩擦滴滴堆中的力量
1Department of Physics, University of Massachusetts, Hasbrouck Laboratory 411, 666 North Pleasant Street, Amherst, MA 01003, USA.
概括
研究人员在3D液滴堆中发现了力链,揭示了微观力如何影响宏观材料的行为. 这一发现是理解像沙堆一样被堵塞的系统的关键.
科学领域:
- 软物质物理学 软物质物理学
- 颗粒力学 颗粒力学
- 统计物理 统计物理
背景情况:
- 了解微观力网与颗粒材料的宏观性质之间的关系至关重要.
- 以前的研究已经在2D系统中探索了力链,但它们的3D表现和影响仍然不太了解.
研究的目的:
- 系统地测量无摩擦液滴的三维 (3D) 堆中的粒子间接触力.
- 为了研究这些3D颗粒系统中强力链的存在和特征.
- 为了将观察到的力网络与颗粒堆的弹性反应 (应变硬化) 相关联.
主要方法:
- 在由无摩擦液滴组成的3D堆内对粒子间接触力的详细测量.
- 对力方向和强度的分析,以确定能表明力链的远程相关性.
- 计算力链持久长度和测量接触角,以了解力平衡.
主要成果:
- 通过测量力大小和方向的长距离相关性,建立了三维力链的直接证据.
- 确定了大约10个平均滴径的力链持久长度,在施加负载下下降.
- 与持久长度相当的高度的颗粒状堆与较高的堆相比,显示出明显更大的应变硬化.
结论:
- 这项研究建立了微观力网络,特别是力链和颗粒堆的宏观弹性行为之间的直接联系.
- 观察到的链状的力量安排是颗粒系统内力量平衡的结果.
- 这些发现与广泛的堵塞系统有关,包括缩乳液,沙堆和其他颗粒物材料.
相关概念视频
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