一、概述利用板料的单向拉伸试验所得的机械性能指标来评定材料的成形性能,是一种最为简便的方法。材料的硬化指数n值大,应变分布比较均匀,有利于拉胀类零件的成形;厚向异性指数r值高,板材不容易变薄,深压延性能就好。但是,根据单向拉伸试验所提供的机械性能指标,只能定性地分析材料完成某一成形工序的难易,而不能直接用来估算具体零件冲压过程的成败。因此,以往 I. Overview The use of sheet metal unidirectional tensile test obtained mechanical properties to evaluate the material formability, is the most simple method. Material hardening index n value is large, the strain distribution is more uniform, is conducive to the forming of parts of drawing; the anisotropy index r value is high, the sheet is not easy to thin, deep rolling properties like. However, according to the mechanical properties provided by the uniaxial tensile test, only the qualitative analysis of the material to complete a forming process is difficult, but can not be directly used to estimate the success of the specific parts stamping process. Therefore, in the past