Transactions of Materials and Heat Treatment

Title：Stress and strain in rounded corner of U-shaped steel in bending forming

Authors： Zheng Junxing1 Zhang Shuhong2 Wu Zhenqiang2 Song Yongjun1

Unit： 1.Xijing University 2.Kunming University of Science and Technology

KeyWords： bending forming U-shaped steel rounded corner stress and strain numerical simulation

ClassificationCode：

year,vol(issue):pagenumber：2016,41(7):38-42

Abstract：

In order to study the variation regulation of stress and strain in rounded corner of the sheet metal during bending process, a theoretical stress analysis was performed firstly in the rounded corner of the U-shaped steel. The analysis results show that the tangential stress of outer layer decreases gradually from the outer surface with the maximum 1.156σs0 in the rounded corner of bending section，the tangential pressure stress of inner layer is the minimum with the absolute value 1.156σs0. Then, the forming processes of sheet with thickness of 4 and 6 mm were simulated respectively by ANSYS/LS-DYNA. The simulation results show that the stress in rounded corner was related to the relative bending radius of the sheet，and bigger than yield strength while smaller than tensile strength，which indicates that the elasticoplastic deformation occurs in the rounded corner. Finally，the strain in rounded corner was analyzed by test device of sheet forming. The analysis results show that the strain in rounded corner is related to the relative bending radius of the sheet and increases with the growth of bending angle，and the further from the rounded corner，the more quickly the deformation reduces.

Funds：

陕西省教育厅科学研究计划项目（14JK1480）

郑军兴（1977- ），男，硕士，讲师，工程师

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