锻压技术

U型钢弯曲成形时圆角部位的应力和应变

英文标题：Stress and strain in rounded corner of U-shaped steel in bending forming

单位：1.西京学院 2.昆明理工大学

分类号：

出版年,卷(期):页码：2016,41(7):38-42

摘要：

为了研究板料弯曲成形时圆角的应力和应变变化规律，首先对U型钢弯曲时圆角部位的应力分布进行了理论分析，分析可知：板料弯曲段圆角处的外层切向应力向中性层逐渐减小，在外表面处达到最大值为1.156σs0；内层的切向应力在内表面最小其绝对值为1.156σs0。采用有限元软件ANSYS/LS-DYNA建立了模型模拟分析了厚度分别为4和6 mm的板料成形过程，模拟可知：圆角处的应力大小与板料的相对弯曲半径有关；圆角部位的应力值大于屈服强度且小于抗拉强度，说明圆角部位发生弹塑性变形。通过建立板料冷弯成形测试装置对板料圆角部位的应变进行了分析，分析可知：板料成形时圆角处的应变大小与板料的相对弯曲半径有关，应变值随弯曲角度的增大不断增加，离圆角部位的距离的越远，变形减少的越快。

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.

基金项目：

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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