Transactions of Materials and Heat Treatment

Title：Influence of loading conditions on formability of light alloy sheet in elastic die forming process

Authors： Xu Dongfang Wen Guanglei Wang Zhifei Lin Yongjian Xiang Nan Guo Junqing

Unit： School of Materials Science and Engineering Henan University of Science and Technology

KeyWords： flexible die forming flexible forming of sheet elastic die loading condition light alloy sheets

ClassificationCode：TG311

year,vol(issue):pagenumber：2022,47(12):56-67

Abstract：

In order to analyze the mechanism of flexible force-transmitting medium improving sheet formability, the elastic die bulging experiments of light alloy sheet under different loading conditions were carried out, and the configuration and strain distribution of sheet were obtained by using digital image correlation technology. Then, the pressure field of elastic die and stress field of sheet were analyzed by finite element software ANSYS/LS-DYNA, and the influence laws of Shore hardness of elastic die, sheet material, sheet thickness and interfacial friction on formability of light alloy sheet were studied by combining experimental and finite element simulation results. The results show that with the increasing of Shore hardness of elastic die, yield strength and thickness of sheet, the forming load increases gradually. The thicker the sheet is, the better the formability is. However, the increasing of yield strength of sheet reduces the uniform plastic deformation of sheet. With the decreasing of Shore hardness of elastic die, the radial stress of sheet decreases, the stress state changes from uniaxial stress state to nearly equally-biaxial tension state, and the filling capacity of sheet increases.

Funds：

国家自然科学基金资助项目（51905156，52275329）；中国博士后科学基金资助项目（2020M672221）

许东方（2001-），男，硕士研究生 E-mail：dongfang_0922@163.com 通信作者：相楠（1987-），男，博士，副教授 E-mail：xiangnan-87@163.com

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