Abstract: 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.

Keywords: semi-fixed abrasive plate large grain discrete element method “trap” effect