不锈钢超薄板的力学性能及成形极限研究  

Study on Mechanical Property and Forming Limit of 304 Stainless Steel

作　　者：吴杰锋[1] 陈炜[1] 张玲[1] 丁毅[1] 雷奎 

机构地区：[1]江苏大学机械工程学院,江苏镇江212013

出　　处：《热加工工艺》2016年第1期127-130,共4页Hot Working Technology

基　　金：博士点基金博导类课题资助(20133227110013)

摘　　要：为了研究三种不同厚度的304不锈钢的力学行为和成形极限,进行了单向拉伸和胀形试验。使用材料力学性能参数建立了刚模胀形有限元模型。结果表明,随着板料厚度的减小,材料的屈服强度先减小后增大,抗拉强度和伸长率先增大后减小,表现出明显的力学性能尺寸效应;超薄板的最大胀形深度和成形极限随着板料厚度的减小先增大后减小,表现出与宏观尺寸不同的变化规律;仿真与试验成形极限曲线较吻合,证明了该模型在预测金属超薄板成形极限上的准确性。In order to investigate the mechanical behavior and the forming limit of 304 stainless steel with three different thicknesses, the uniaxial tensile test and bluging test were performed. The finite element model of rigid die bulging was established by using material mechanical property parameters. The results show that with the decreasing of sheet metal thickness, the yield strength of the material decreases first and then increases,and the tensile strength and elongation increases first and then decreases. This shows obvious size effect of mechanical properties. The maximum bluging depth and forming limit of the ultra-thin sheet increase first and then decrease with decreasing thickness of the sheet. This shows different change rules with one of the macro-size. The forming limit curve of simulation and experiment is consistent, which proves accuracy of the model in the forecasting ultra thin sheet forming limit.

关 键 词：尺寸效应 304不锈钢 拉伸试验 力学性能 成形极限 

分 类 号：TG386[金属学及工艺—金属压力加工]