摘要
在多轴加载试验机上开展了St1 4 T冷轧薄板单拉和双拉预变形试验 ,在此基础上采用CAMSYS自动网格分析仪测量了板料的极限应变 ,分析了预变形对板料成形极限的影响。试验结果表明 :加载应变路径的变化会影响成形极限曲线的高低。单拉预应变路径将显著提高正应变比区的成形极限 ,而对负应变比区的成形极限影响不大。等双拉预应变将明显降低正应变比区的成形极限 ,对负应变比区的成形极限有所提高。随着等双拉预应变量的增加 。
After the uniaxial and equiaxial prestrain test of cold rolled St14 T sheet have been carried out on a multiaxial loading tester,the limit strains of metal sheet are measured by the CAMSYS automatic grid analyzer and the effects of prestrain on forming limit of metal sheet are analyzed.It is shown that the change of loading strain path will affect the forming limit curve.Uniaxial prestrain will obviously improve the forming limit on positive strain ratio zone,while it has little effect on negative strain ratio zone.Equiaxial prestrain will obviously decrease the forming limit on positive strain ratio zone,while it slightly improves the forming limit on negative strain ratio zone.With the increase of equiaxial prestrain,the forming limit of metal sheet will decrease.
出处
《宝钢技术》
CAS
2001年第6期23-26,共4页
Baosteel Technology
