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在单体球体的负载控制的剪切流中结晶
Esma Kurban1, Dalila Vescovi1, Diego Berzi1
1Politecnico di Milano, 20133 Milano, Italy. dalila.vescovi@polimi.it.
Soft matter
|January 16, 2025
概括
在剪切的球体上增加摩擦会导致结晶或流化. 增加的摩擦可以意外地降低剪切阻力,而更高的负载可以创建独立于摩擦的鲜明的流动和晶体区域.
科学领域:
- 颗粒状材料的物理学 颗粒状材料的物理学
- 计算物理学的计算物理.
- 材料科学是一种材料科学.
背景情况:
- 颗粒状材料在剪切下表现出复杂的流动和结晶行为.
- 粒子间摩擦在这些现象中的作用尚未完全理解.
研究的目的:
- 研究粒子间摩擦对剪切相同的不弹性球体结晶和流动动学的影响.
- 分析施加负载对摩擦依赖颗粒状物行为的影响.
主要方法:
- 使用离散元素模拟来建模剪切颗粒组件的行为.
- 粒子间摩擦系数和施加负载的系统变化.
主要成果:
- 在接近结晶值的低负荷下,微小的摩擦会产生剪切带和结晶区域,增加剪切阻力.
- 在低负载下增加的摩擦会破坏订单,导致流化,与没有摩擦的情况下相比,剪切阻力降低.
- 在较高的负载下,形成明显的核心剪带和边界晶体区域,剪阻变得独立于摩擦.
结论:
- 粒子间的摩擦显著改变了剪切颗粒材料的流动模式和结晶.
- 施加的负载决定了摩擦是否增强或减少剪切阻力,并影响了有序和无序区域的空间组织.
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