Transactions of Materials and Heat Treatment

Title：Analysis on particle movement and energy in dense molding process of salix particles

Authors： Li Zhen Yu Jin Yu Yue Wan Tao Hao Yuchao

Unit： Inner Mongolia University of Science and Technology

KeyWords： salix particles dense molding pressure kinetic energy bond energy

ClassificationCode：TK6

year,vol(issue):pagenumber：2022,47(5):135-143

Abstract：

In order to study the laws of particle movement and energy change in the dense molding process of salix, a particle model with aspect ratio of 5∶1 was established by discrete element particle flow software PFC3D. Then, according to the characteristics of stress-strain curve, the dense molding process of salix particles was divided into three stages, such as loose stage, compaction stage and plastic stage. Furthermore, from each of the three stages, a time point was selected to detailed analyze the changes of particle velocity, displacement, force component and energy. The results show that the main influencing factor of particle velocity and displacement changes is pressure. During the process of pressure transmission, the contact force between particles and the reaction force of wall change continuously, and the velocity component and displacement component along the X-axis and Y-axis direction gradually increase. From the loose stage to the compaction stage, the particle position is rearranged and the gap changes continuously, and the kinetic energy shows fluctuating changes. In the plastic stage, the pressure overcomes the maximum force between particles, the particle deformation produces plastic flow, the gap decreases continuously, and the kinetic energy increases gradually. In the whole compression process, the growth trend of bond energy slows down, and the proportion of other dissipated energy gradually increases. Thus, in order to reduce the loss of energy, the strain value should be controlled within a small range.

Funds：

内蒙古自治区自然科学基金资助项目（2020LH05020）；国家自然科学基金资助项目（51666016）

作者简介：李震（1973-），男，博士，教授，E-mail：lizhen_730106@126.com；通信作者：于今(1992-)，男，硕士，E-mail：570844146@qq.com

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