大颗粒形状对半固着磨粒磨具“陷阱”效应影响的离散元仿真

Simulation on the indentation of large grain in semi-fixed abrasive plate using discrete element method

本文基于离散元的方法研究了不同顶角的大颗粒对半固着磨粒磨具"陷阱效应"的影响,在研究的过程中应用了PFC2D离散元软件,分别模拟了90°、120°和150°顶角的大颗粒,采集到大颗粒压入半固着磨粒磨具时受到的法向作用力和竖直位移之间的曲线图。由于半固着磨粒磨具内部布满了空隙,使得大颗粒能比较容易的陷入磨具中,减少了大颗粒对工件表面的损伤。通过以上大颗粒离散元模拟可知,半固着磨粒磨具"陷阱"效应持续的时间和大颗粒顶角大小成反比关系,即大颗粒的顶角越小,磨具"陷阱"效应持续时间越长,所以大颗粒的顶角大小是影响半固着磨粒磨具"陷阱"效应发挥的重要因素。

This paper analyses the influence of large grain＇s vertex angle on the ＂trap＂ effect of the semi-fixed abrasive plate （SFAP） using discrete element method. The large grains of different （such as 90°, 120°, 150°） vertex angle are simulated using PFC2D discrete element software, finally three curves of normal force and displacement are gained. From the curves, we can see that the normal force of the large grain doesn＇ t increase quickly but keeps stable in the beginning, because the SFAP is full of pores, which let the large grain easily press into the SFAP. Through the above tests, it is found that the relations between the lasting time of the ＂trap＂ effect and the large grain＇s vertex angle are in reverse proportion, if the large grain＇s vertex angle is smaller, the lasting time of the ＂trap＂ effect of SFAP is longer, and the size of large grain is an influencing factor in the ＂trap＂ effect of SFAP.