基于有限元/离散元耦合的大理石高速划擦过程仿真

针对大理石的磨粒加工过程，借助有限元/离散元耦合方法建立了单颗磨粒的高速划擦仿真模型，并通过在实体单元中插入零厚度内聚力单元，控制内聚力单元的失效来实现大理石加工过程中裂纹的萌生及扩展过程。基于所建立的单颗磨粒划擦模型，对比了划擦深度和划擦速度对大理石去除过程的影响。结果表明:大理石划擦过程中划擦力和加工表面损伤层厚度随划擦速度和划擦深度的增加而显著增大，且划擦力与损伤层厚度存在正相关性。 

Simulation of high-speed scratching process of marble based onfinite element/discrete element coupling method

To study the grinding process of marble with abrasive particles, a high-speed scratch simulation model of single abrasive particle was established by means of finite element / discrete element method. By inserting the cohesive element with zero thickness into the solid element and controlling the failure of the cohesive element, the initiation and propagation of cracks in the marble machining process were realized. The effects of scratch depth and scratch speed on marble removal process were analyzed based on the established model. The results show that scratch force and thickness of the damaged layer increase with the increase of the scratch speed and depth, and that there is a positive correlation between the scratch force and the thickness of the damaged layer.