前言国际深冲研究组‘材料’工作组共同研究的塑性各向异性比值‘r’和加工硬化指数‘n’与薄板材料的冲压性能的关系,已获得了联合研究的成功结果。这一研究工作由两个连续阶段组成: Ⅰ、为了确定比值‘r’和‘n’,由所有参加这一工作的实验室共同负责改进基准方法。 INTRODUCTION The relationship between the plastic anisotropy ratio ’r’ and the work hardening index ’n’ and the stamping properties of sheet materials jointly developed by the ’Materials’ Working Group of the International Deep-Drawing Research Group has yielded successful results in a joint study. This research consists of two successive phases: I. In order to determine the ratios ’r’ and ’n’, the laboratories participating in this work share the responsibility of improving the baseline methodology.