首页 | 本学科首页   官方微博 | 高级检索  
     

ADAPTIVE RIGID-PLASTIC MESHLESS GALERKIN METHOD AND ITS APPLICATION IN ANALYSIS OF EXTRUSION PROCESSES
作者姓名:WU Xin School of Mechanical Engineering  Hangzhou Dianzi University  Hangzhou  China Engineering Research Center for Mould & Die Technology  Shandong University  Jinan  China ZHAO Guoqun WANG Weidong GUAN Yanjin LU Ping Engineering Research Center for Mould & Die Technology  Shandong University  Jinan  China
作者单位:WU Xin School of Mechanical Engineering,Hangzhou Dianzi University,Hangzhou 310018,China Engineering Research Center for Mould & Die Technology,Shandong University,Jinan 250061,China ZHAO Guoqun WANG Weidong GUAN Yanjin LU Ping Engineering Research Center for Mould & Die Technology,Shandong University,Jinan 250061,China
基金项目:This project is supported by National Natural Science Foundation for Dis-tiguished Young Scholars of China (No. 50425517).
摘    要:Under the hypothesis of the rigid-plastic material,specific efforts are placed on the deve-lopments of the key simulation techniques of the meshless Galerkin method because of the complexity of the deformation process as well as the generality and atomization of the simulation procedures for non-steady state large deformation plastic processes,therefore,an adaptive rigid meshless Galerkin method is developed. The influence domain control method is used in the least square approximation by dynamic evaluation of the magnitude of the influence domain and the effective control of the amount and the positions of the points in the least square approximation in order to improve approxi-mation precision. The amount of the Gauss integration points in the discrete domain is maintained in a considerable magnitude in order to ensure the integration precision in the discrete domain. The length of the frictional boundary of the plastic deformation process may be getting longer when its deforma-tion is getting severe. Thus,the densities of the boundary points of some places get lower. The adap-tive boundary points setting method is employed to improve the approximation precision of the boundary points and enhance the constraint of the boundary condition by adaptive control of boun-dary point density. Some typical extrusion processes are analyzed,detail simulation results such as the deformation field,velocity field,effective strain field,effective strain rate field,the volume loss curve and load-stroke curve are obtained. The effectiveness of the method developed is demonstrated and the precision of the meshless simulation is proved by overall comparison with the results obtained by using the commercial software deform.

关 键 词:自适应  刚性-塑性材料  无网格伽辽金法  挤压加工过程  应用  形变

ADAPTIVE RIGID-PLASTIC MESHLESS GALERKIN METHOD AND ITS APPLICATION IN ANALYSIS OF EXTRUSION PROCESSES
WU Xin School of Mechanical Engineering,Hangzhou Dianzi University,Hangzhou ,China Engineering Research Center for Mould & Die Technology,Shandong University,Jinan ,China ZHAO Guoqun WANG Weidong GUAN Yanjin LU Ping Engineering Research Center for Mould & Die Technology,Shandong University,Jinan ,China.ADAPTIVE RIGID-PLASTIC MESHLESS GALERKIN METHOD AND ITS APPLICATION IN ANALYSIS OF EXTRUSION PROCESSES[J].Chinese Journal of Mechanical Engineering,2007,20(2):26-31.
Authors:WU Xin ZHAO Guoqun WANG Weidong GUAN Yanjin LU Ping
Abstract:Under the hypothesis of the rigid-plastic material, specific efforts are placed on the developments of the key simulation techniques of the meshless Galerkin method because of the complexity of the deformation process as well as the generality and atomization of the simulation procedures for non-steady state large deformation plastic processes, therefore, an adaptive rigid meshless Galerkin method is developed. The influence domain control method is used in the least square approximation by dynamic evaluation of the magnitude of the influence domain and the effective control of the amount and the positions of the points in the least square approximation in order to improve approximation precision. The amount of the Gauss integration points in the discrete domain is maintained in a considerable magnitude in order to ensure the integration precision in the discrete domain. The length of the frictional boundary of the plastic deformation process may be getting longer when its deformation is getting severe. Thus, the densities of the boundary points of some places get lower. The adaptive boundary points setting method is employed to improve the approximation precision of the boundary points and enhance the constraint of the boundary condition by adaptive ccntrol of boundary point density. Some typical extrusion processes are analyzed, detail simulation results such as the deformation field, velocity field, effective strain field, effective strain rate field, the volume loss curve and load-stroke curve are obtained. The effectiveness of the method developed is demonstrated and the precision of the meshless simulation is proved by overall comparison with the results obtained by using the commercial software deform.
Keywords:Rigid-plastic Galerkin Adaptive Non-steady state Extrusion Severe deformation  PROCESSES  EXTRUSION  ANALYSIS  APPLICATION  GALERKIN METHOD  MESHLESS  effectiveness  comparison  simulation results  commercial  software  deformation field  volume  loss  curve  strain rate field  strain field  velocity  typical  extrusion
本文献已被 CNKI 维普 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号