Transactions of Materials and Heat Treatment

Title：Research on stress, strain and metal flow in hydroforming for unilateral parallel double branch tube

Authors： Chen Mingtao Xiao Xiaoting Zhou Fuqiang

Unit： Shaoguan University Guangdong University of Technology Guangdong Sihao Hydroforming Technology Co. Ltd.

KeyWords： parallel double branch tube hydroforming stress strain metal flow

ClassificationCode：TG394

year,vol(issue):pagenumber：2021,46(4):106-110

Abstract：

To investigate the plastic deformation law of unilateral parallel multi-branch tube in hydroforming, for the parallel double branch tube, its stress and strain states as well as metal flow law were analyzed by numerical simulation method and combined with the shape of tube. The results show that under the combined action of axial compression and internal pressure for parallel double branch tube, the wall thickness at the top of branch tube is reduced due to the bidirectional tensile stress, and the strain along the thickness direction at the top is compressive strain. Furthermore, the wall thickness of fillet areas on both sides of branch tube is increased due to the three-directional compressive stress, the strain along the thickness direction at the fillet area is tensile strain, and the thickening on the outer fillet of branch tube is more significant than that on the inner fillet. However, because the main tube material between the two branch tubes (inside) is difficult to flow to the branch tube, the branch tube only relies on unilateral axial compression to complete the filling, which makes the branch tube center shift inward, and the branch tube shape presents an asymmetric structure, which limits the forming height of branch tube.

Funds：

广东省教育厅青年创新人才科技项目(2020KQNCX077)；2019 年度韶关学院校级科研项目(SY2019ZK01)；韶关市2019年科技计划（社会发展与企业科技特派员方向)项目(2019sn054)；韶关学院科研启动项目(44099000618)；2019年佛山市核心技术攻关项目（1920001001369）

陈名涛（1990-），男，博士 E-mail：cmt9090@163.com

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