Transactions of Materials and Heat Treatment

Title：Analysis on material deformation in metal blanking process based on digital image correlation technique

Authors： Chen Ziyan Fang Gang Lei Liping

Unit： Tsinghua University

KeyWords： digital image correlation sheet metal blanking large deformation fracture

ClassificationCode：TG386

year,vol(issue):pagenumber：2016,41(11):47-53

Abstract：

In order to investigate the material deformation and fracture behavior in the metal sheet blanking process, an in-situ strain measurement system was established by 2D digital image correlation technique. Then, a series of blanking experiments were carried out on copper alloy sheet CuSn0.15, and the strain distributions of the strain components in the blanking process were obtained by in-situ strain measurement system recording the localized large-deformation. Furthermore, the regulation of strain and the difference of strain field with different clearances were analyzed further. The results indicate that the shear strain is predominant at the early stage of the blanking process, while a rapid increase of tensile strain at the later stage leads to the micro cracks inside the material. Thus, the difference of strain field with different clearances is mainly shown on the distinction of tensile strain, and the difference of tensile strain is a main factor influencing the proportion of bright region in the thickness direction of sheet metal. The experiment results provide basic data not only for blanking technology, but also for verifying the effectiveness of the numerical model.

Funds：

国家自然科学基金资助项目（51375256）

陈子砚（1990-），女，硕士研究生雷丽萍（1968-），女，博士，副研究员

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