ZHANG Changsong¹, GAO Xiaoyang¹, CHEN Feichang¹, TAO Jun²

(1.College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China;2.Xi’an Modern Chemistry Research Institute, Xi’an 710065, China)

Abstract：The multi-scale simulation model of the mechanical activation process of micron-sized powder was developed based on the high energy vertical agitator model, CFD-DEM coupling was used to model the motion of the ball.When ball grinding was steady, the probability ratio of various ball collision relative velocities was examined.The motion distribution area of micron powder was examined in accordance with the dense discrete phase model, and the powder stressing probability analysis model was developed based on the findings of the simulations mentioned above.The results show that the outcomes of the simulation demonstratea clear correlation between the stress probability of powder and the ratio of the tangential and normal components of the relative velocity of grinding ball contact.The fitting curve of the relation between them is exponential function curve.The determination coefficient R² is 0.93, which is close to 1, the prediction effect of fitting curve is ideal.The curve offers a numerical foundation for evaluating the powder plastic deformation and crushing rate.

Keywords：high energy ball mill；computational fluid dynamics-discrete element method；stress probability；multiscale modeling

Received：2022-08-13，Revised：2022-09-14,Online：2023-01-04 10:48。

Funding Project:西安近代化学研究所开放合作创新基金项目，编号：SYJJ200304。

First Author:张昌松(1976—)，男，副教授，博士，硕士生导师，研究方向为离散元法、有限元仿真、材料成型技术。E-mail：zhangcs@sust.edu.cn。