刚性粒子流法模拟自由锻造工艺的探索

中国机械工程 ›› 2014, Vol. 25 ›› Issue (19): 2674-2680.

刚性粒子流法模拟自由锻造工艺的探索

刘敏1;朱明2;马庆贤1;艾鲸3

1.清华大学先进成形制造教育部重点实验室,北京,100084
2.北京华成经纬软件科技有限公司,北京,100085
3.中国人民解放军驻617厂军事代表室,包头,014030

出版日期:2014-10-10 发布日期:2014-10-14
基金资助:
国家重点基础研究发展计划(973计划)资助项目(2011CB012903)；国家科技重大专项(2011ZX04014-051)

Investigation of Rigid Particle Flow Method in Simulating Free Forging Processes

Liu Min1;Zhu Ming2;Ma Qingxian1;Ai Jing3

1.Key Laboratory for Advanced Materials Processing Technology of Ministry of Education,Tsinghua University, Beijing, 100084
2.Beijing Huacheng Jingwei Software Science and Technology Corporation Ltd.,Beijing,100085
3.Military Representative Office in 617 Factory,the Chinese People's Liberation Army,Baotou,Neimenggu,014030

Online:2014-10-10 Published:2014-10-14
Supported by:
National Program on Key Basic Research Project (973 Program)（No. 2011CB012903）;National Science and Technology Major Project ( No. 2011ZX04014-051)

摘要/Abstract

摘要：

基于网格的数值计算方法在处理自由锻造、冲压成形、高速碰撞、裂纹动态扩展等大塑性变形问题时,往往会因网格畸变和网格重构困难使得计算精度丢失甚至无法计算。针对该问题,基于连续介质力学理论和分子动力学基本原理,采用一种求解金属大塑性变形的数值模拟方法——刚性粒子流法,建立了刚性粒子流法的数学模型并探讨了初始粒子配置、粒子搜索算法、数值积分和边界条件等关键数值技术。将该方法应用到核电饼类锻件高温镦粗和大型核电封头终锻成形两个数值算例中,计算结果表明：模拟大塑性变形问题时,刚性粒子流法与实验结果能够较好地吻合,有效地解释了大型饼类锻件夹层裂纹和封头锻件层状撕裂的形成机制。研究结果为进一步采用该方法模拟变形更加复杂的自由锻造工艺提供了参考。

关键词: 刚性粒子流法, 分子动力学, 大塑性变形, 数值模拟

Abstract:

When grid-based numerical methods dealt with large plastic deformation problems such as free forging,stamping forming, high speed impact and dynamic crack propagation,there was frequently loss of calculation accuracy due to mesh distortion and remeshing difficulties, or even the calculation could not be conducted. Aiming at these problems, a numerical simulation method for large metal plastic deformation-RPF method was proposed based on theory of continuum mechanics and the basic principles of molecular dynamics. A mathematical model for RPF method was established and critical numerical techniques such as initial particle configuration, particle search algorithm, numerical integration and boundary conditions were studied. When RPF method was applied to high temperature upsetting of nuclear power disk forgings and finish forging of heavy nuclear power head, the calculation results show that for simulating large plastic deformation problems, the results of RPF method are in good agreement with the experimental ones, and RPF method can effectively explain the formation mechanism of laminated cracks in heavy disk forgings and lamellar tearing in head forgings. This research lays the foundation for further simulating more complex free forging processes using RPF method.

Key words: rigid particle flow(RPF) , method;molecular dynamics;large plastic deformation;numerical simulation

中图分类号:

TG302

刘敏, 朱明, 马庆贤, 艾鲸. 刚性粒子流法模拟自由锻造工艺的探索[J]. 中国机械工程, 2014, 25(19): 2674-2680.

Liu Min, Zhu Ming, Ma Qingxian, Ai Jing. Investigation of Rigid Particle Flow Method in Simulating Free Forging Processes[J]. China Mechanical Engineering, 2014, 25(19): 2674-2680.

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