摘要
采用多粒子有限元法模拟氧化锆颗粒的双向压制成形过程。采用离散元法建立氧化锆颗粒无序堆积模型,系统分析氧化锆粉末压制过程中相对密度、应力分布、空隙填充行为,以及保压和卸压过程中力链的演变规律。结果表明,随着压制力增大,氧化锆颗粒的相对密度不断增加,颗粒间的作用力也逐渐增大。在压制初期,颗粒的重排对粉体成形的致密化起主要作用。随着成形的进行,大部分颗粒在压制力作用下形成网状力链,颗粒内部应力也随之增大。卸压后,原本密集的网状力链变得稀疏,甚至部分力链消失。
Multiparticle finite element method is used to simulate the bidirectional pressing forming process of zirconia particles.By means of the model,the relative density,stress distribution,gap filling behavior,and the evolution law of the force chain during pressure-holding and pressure-relief are systematically analyzed d.The results show that the relative density of the zirconia particles increases,and the force between the particles increases.At the beginning of suppression,the rearrangement of particles plays a major role in the compaction of powder forming.With the molding,most of the particles formed a mesh force chain under the action of pressing force,and the internal stress of the particles also increased.After pressure relief,the originally dense mesh force chain becomes sparse,and even part of the force chain disappears.
作者
张健
高刚毅
栾奕
张大征
郭菁
ZHANG Jian;GAO Gangyi;LUAN Yi;ZHANG Dazheng;GUO Jing(School of Materials and Metallurgy,University of Science and Technology Liaoning,Anshan 114051,China;Sichuan Liuhe Special Metal Materials Co.,LTD.,Jiangyou 621701,China)
出处
《辽宁科技大学学报》
CAS
2023年第3期181-186,共6页
Journal of University of Science and Technology Liaoning
基金
国家自然科学基金(U1860112)
2022年辽宁科技大学大学生创新创业训练计划。
关键词
高温合金
耐火材料
氧化锆粉末
压制成形
有限元分析
superalloy
refractory materials
zirconia powder
pressing forming
finite element analysis
