中国机械工程Issue(19)：2674-2679,2680,7.DOI:10.3969/j.issn.1004-132X.2014.19.022
刚性粒子流法模拟自由锻造工艺的探索
Investigation of Rigid Particle Flow Method in Simulating Free Forging Processes
摘要
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 fre-quently loss of calculation accuracy due to mesh distortion and remeshing difficulties,or even the cal-culation 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 calcula-tion 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 forma-tion 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 .关键词
刚性粒子流法/分子动力学/大塑性变形/数值模拟Key words
rigid particle flow(RPF)method/molecular dynamics/large plastic deformation/nu-merical simulation分类
矿业与冶金引用本文复制引用
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,(19):2674-2679,2680,7.基金项目
国家重点基础研究发展计划(973计划)资助项目(2011CB012903) （973计划）
国家科技重大专项(2011ZX04014-051) （2011ZX04014-051）
