Determination and application of stress-based forming limit diagram in aluminum tube hydroforming

摘要：

The stress-based forming limit diagram(FLSD) established with limit stress is independent of the strain paths.Compared with traditional strain-based forming limit diagram(FLD),it is more convenient and practical to use as the criterion of forming limit under complex strain paths.The forming limit of 3A21 aluminum alloy sheet was tested and its forming limit diagram(FLD) was determined.Then the FLSD of 3A21 was constituted by transformation formulas between limit strain and limit stress.This FLSD was used in conjunction with LS-DYNA finite element simulations to predict the onset of fracture and limit forming pressure in tube hydroforming.The results indicate that the fracture often occurs in the transition region between corner and straight side of the tube,and the limit forming pressure is 46.4 MPa.The simulation result agrees with the experimental result,and the FLSD is able to predict the forming limit of tube hydroforming with remarkable accuracy.

关键词： 3A21 aluminum alloy hydroforming fracture forming limit stress diagram numerical simulation

作者: ZHOU Lin XUE Ke-min LI Ping

作者单位: School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China

会议类型: 国际会议

会议名称: 2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)

会议地点: 长沙

会议语种:英文

在线出版日期: 2007-11-28（万方平台首次上网日期，不代表论文的发表时间）