WU Zhen^1a, WANG Liqiang¹, XU Limin², GAO Weijun²

(1a.School of Mechanical Engineering, 1b. Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology,Jiangnan University, Wuxi 214122, China; 2. Jiangsu Innovative Packaging Technology Co., Ltd.,Yangzhou 225600, China)

Abstract：Before the discrete element simulation of powder materials, it is necessary to obtain accurate discrete element simulation parameters through the parameter calibration process. The existing parameter calibration mostly takes the static angle of repose as a single response value, which can not fully reflect the real performance of powder. In order to improve the precision of discrete element simulation parameters of titanium dioxide, static angle of repose and dynamic angle of titanium dioxide were selected as macro-response indexes. Mean values of static and dynamic repose angles of titanium dioxide were measured by self-made measuring devices. Particle size and cutting modulus of titanium dioxide were simplified according to the principle of particle size similarity and stiffness reduction, and the discrete element simulation model was established. The discrete element simulation parameters which have little effect on the angle of repose were excluded by single factor test. Box-Behnken test was used to establish the second order regression equations of static and dynamic angle of repose, and the optimal discrete element simulation parameter combination was obtained by taking the actual measured angle of repose as the target value. The discrete element simulation parameters were verified by experiments, and the calibration of titanium dioxide simulation parameters was realized. The results show that when the static friction coefficient of titanium dioxide-titanium dioxide is 0.51, rolling friction coefficient is 0.29, static friction coefficient of titanium dioxide-stainless steel is 0.62, and rolling friction coefficient is 0.17, the discrete element simulation parameter combination of titanium dioxide is the best. The static and dynamic repose angles obtained by simulation are 40.4° and 66.2° respectively, and the relative errors with measured values are 1.22% and 1.07%, respectively.

Keywords：titanium dioxide; particle simplification; static angle of repose;dynamic angle of repose;discrete element method; parameter calibration

Get Citation：WU Z, WANG L Q, XU L M, et al. Discrete element parameters calibration of titanium dioxide based on static and dynamic repose angles[J]. China Powder Science and Technology, 2023, 29(4): 108-119.

DOI：10.13732/j.issn.1008-5548.2023.04.011

Received：2023-03-09,Revised：2023-05-22,Online：2023-06-15 12:01。

Funding Project：中央高校基本科研业务费专项资金项目,编号:JUSRP21115;江苏省食品先进制造装备技术重点实验室自主资助基金项目,编号:FMZ201902。

First Author：吴震(1998—),男,硕士研究生,研究方向为包装工艺与机械。E-mail: wzhen19980718@163.com。

Corresponding Author：王利强(1977—),男,教授,博士,博士生导师,研究方向为包装机械。E-mail: wlqcom@163.com。