|
摘要：
|
|
电磁胀环是研究高速率成形变形规律的重要实验手段之一。圆环上的磁压力分布对变形模式及分布有重要影响,本文设计两种电磁胀环方案,用有限元方法模拟分析磁压力及变形分布。结果表明,自由电磁胀环下磁压力沿轴向和径向分布不均,导致变形分布不均匀;而改用在环件两端加同材质套管的胀形后,圆环上磁压力沿径向分布均匀,轴向很小可忽略,变形分布也趋于均匀,便于变形测量及理论分析,研究高速变形规律更为有效。
|
|
Electromagnetic ring expansion is one of the most important methods in studying deformation laws of high rate forming.The distribution of ring's electromagnetic force affects its deformation mode.Two projects were designed to simulate electromagnetic force and deformation distribution with FEA.It indicates that original free electromagnetic ring expansion leads to inhomogeneity of deformation due to uninformed electromagnetic force.The method was improved by using the same material tube accessed at both end of the ring and completely uniformed radial electromagnetic force and consistent plastic strain distribution were got to make measurements and analysis simple.It is proved to be a more effective method in studying high rate deformation.
|
|
基金项目：
|
|
塑性成形模拟及模具技术国家重点实验室资助项目(05-03)
|
|
作者简介：
|
|
|
|
参考文献：
|
[1]Mala Seth.High velocity formability and factors affecting it[D].Ohio:The Ohio State University,2006.
[2]William H.Gourdin.Analysis and assessment of electromag-netic ring expansion as a high-strain-rate test[J].J.Apply.Phys.,1988,65(2):411-422.
[3]Grady D E,Benson D A.Fragmentation of metal rings by e-lectromagnetic loading[J].Experimental Mechanics,1983,23(4):393-400.
[4]Altynova MM.The improved ductility of aluminum and cop-per rings by electromagnetic forming technique[D].Ohio:The Ohio State University,1995.
[5]Altynova M,Hu XY,Daehn GS.Increased ductility in elec-tromagnetic ring expansion[J].Metal Mater.Trans.A,1996,27(7):837-844.
[6]Tamhane Amit,Altynova Marina M,Daehn Glenn S.Effectof sample size on ductility in electromagnetic expansion[J].Scripta Materialia,1996,34(8):1345-1350.
[7]黄尚宇,常志华,田贞武,等.管件电磁成形电磁力分布特性分析[J].塑性工程学报,2000,7(2):30-34.
|
|
服务与反馈：
|
|
【本网站尚未开通全文下载服务】【加入收藏】
|
|
|
|
