Requirement of forming limit curve appears indispensible for property check during formable sheet metal development cycle and quality control of formable sheet metal at production shop floor. In the present work, left side of the forming limit curve (uniaxial tensile to plane strain tensile) is experimentally determined from in-plane uniaxial and notch tensile test with local strain measurement through digital image correlation technique. A novel procedure has been developed to generate forming limit curve with considerably reduced experimental effort. The proposed new procedure is based on a combination of in-plane uniaxial notch tensile test with local strain measurement and modeling. The forming limit curve generated using the new procedure has been compared with the standard procedure (Nakajima test) and a good correlation has been obtained.

中文翻译：

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通过数字图像相关性通过局部应变测量从平面内单轴和缺口拉伸测试生成成形极限图

成形极限曲线的要求对于可成形钣金开发周期中的性能检查和生产车间可成形钣金的质量控制来说是必不可少的。在目前的工作中，成形极限曲线的左侧（单轴拉伸到平面应变拉伸）是通过面内单轴和缺口拉伸试验通过数字图像相关技术通过局部应变测量实验确定的。已开发出一种新程序来生成成形极限曲线，同时大大减少了实验工作。所提出的新程序基于面内单轴缺口拉伸试验与局部应变测量和建模的组合。使用新程序生成的成形极限曲线已与标准程序（中岛试验）进行了比较，并获得了良好的相关性。