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

参考文献：

[1]戴宏胜，龚曙光，彭炎荣.饶刚宽板塑性弯曲应变增量中性层的分析[J].塑性工程学报, 2010,30(3):364-367.

Dai H S,Gong S G,Peng Y R. Strain increment neutral layer analysis of wide steel plate plastic bending [J].Journal of Plasticity Engineering, 2010,30(3):364-367.

[2]宋涛，桂海莲，周存龙.中厚板弯曲时应力中性层位置的求解[J].中国重型装备,2011,31（2）:201-204.

Song T,Gui H L,Zhou C L. Solution of the stress neutral layer position of the medium thickness plate bending[J].Chinas Heavy Equipment,2011,31（2）:201-204.

[3]王成轩，高丽华.影响冷弯C型钢腰部弯曲处最大压力因素分析[J].淮海工学院学报,2012,34(3):111-116.

Wang C X,Gao L H. Factor analysis of maximum pressure about the cold bending C steel bend waist[J].Journal of Institute and Technology of Huaihai,2012,34(3):111-116.

[4]贾美慧，唐承统，刘检华.管材弯曲中应力中性层位移计算与影响因素分析[J].材料科学与工艺,2014,24(2):224-227.

Jia M H,Tang C T,Liu J H. Displacement calculation and influence factors analysis of pipe bending stress neutral layer[J]. Materials Science and Technology,2014,24(2):224-227.

[5]Livatyali H, Altan T.Prediction and elimination of springback in straight flanging using computer aided design methods[J].Journal of Material Processing Technology,2011,117:263-269.

[6]张美君，刘福贺.铝合金多楔带轮旋压成形数值分析与试验研究[J]. 锻压技术,2015, 40(2): 79-86.

Zhang M J, Liu F H. Numerical analysis and experimental study on spinning forming of Al alloy multiple V-groove pulley [J]. Forging & Stamping Technology, 2015, 40(2): 79-86.

[7]杨勇，何涛，汪泽轩，等.T91楔横轧成形过程的数值模拟与分析[J]，锻压技术,2015,40(10):148-153.

Yang Y,He T,Wang Z X, et al. Numerical simulation and analysis of the forming process of T91 cross wedge rolling[J].Forging & Stamping Technology, 2015,40(10):148-153.

[8]白玉宁，缑斌丽，吴志威.冲裁模具间隙及凹模圆角对凸模应力应变影响的有限元分析[J].机械工程师，2011,(9):526-529.

Bai Y N,Hou B L,Wu Z W. Finite element analysis of blanking die gap and die round corner to punch the influence of stress and strain[J].Mechanical Engineer, 2011,(9):526-529.

[9]Kang C G, Seo P K. The effect of globular microstructure size on the mechanical properties in reheating process of aluminum alloys[J]. Journal of Materials Engineering and Performance, 2004, 13(2): 172-184.

[10]吴振强.冷弯成型有限元分析及实验研究[D].昆明:昆明理工大学, 2004.

Wu Z Q.Cold Bending Forming Finite Element Analysis and Experimental Research[D]. Kunming:Kunming University of Science and Technology, 2004.

[11]黄娜，余际星，成秀文，等. GQ280钢冲压成形应用及回弹控制模拟[J]. 锻压技术,2014,39(2): 57-62.

Huang N，Yu J X，Cheng X W, et al. Stamping application and springback control simulation for GQ280 steel[J]. Forging & Stamping Technology，2014，39(2): 57-62.

服务与反馈：

【文章下载】【加入收藏】