Transactions of Materials and Heat Treatment

Title：Study of sheet deformation characteristics under the cyclic loading applied by semicircle drawbead

Authors： LI Qun LI Na GUO Bao-feng JIN Miao

Unit： Key Laboratory of Advanced Forging & Stamping Technology and Science Yanshan University

KeyWords： sheet forming cyclic loading semicircle drawbead isotropic hardening load branch tangent modulus

ClassificationCode：TG386.1

year,vol(issue):pagenumber：2013,38(2):31-33

Abstract：

As for the cyclic loading characteristics of bending, unloading and reverse bending in the process of sheet deformation in semi-circle draw bead, with the model of isotropic hardening rule based on Mises yield criterion, the process of sheet deformation when flowing along semi-circle draw bead was analyzed by finite element analysis and the history stress-strain curves of sheet nodes along the flowing direction were gained. The results show that sheet undergoes the plastic deformation processes of bending, unloading and reverse bending twice, and the cyclic loading has four loading branches in total. The relationship between stress and strain of cyclic loading curve in different branches can be approximately considered as a linear hardening. With the increase of the number of cyclic loading, the tangent modulus indicating the hardening in different loading branches decreases, and hardening would not happen in the process of the second reverse bending.

Funds：

国家自然科学基金资助项目(50305031)；河北省自然科学基金资助项目（E2008000824）；河北省科技计划项目（12217621）。

Reference：

［1］李群.板材在拉深筋中的循环变形特征及后续成形性能研究[D].秦皇岛：燕山大学，2011.
［2］Nine H D. The applicability of coulomb's friction law to drawbeads in sheet metal forming[J]. Journal of Applied Metal Working, 1982, 2(3):200-210.
［3］杨玉英,金朝海,王荣芳,等.拉深筋成形二维弹塑性有限元数值模拟[J]. 塑性工程学报, 2001, 8(1):31-34.
［4］李东升, 黄小明, 胡世光. 汽车覆盖件成形中拉延筋约束力的模拟计算[J]. 塑性工程学报, 1994, 1(3): 59-65.
［5］李淑慧, 林忠钦, 包友霞. 改进的等效拉延筋阻力模型及其应用[J]. 中国机械工程, 2002, 13(7): 558-561.
［6］史东才, 郭成,程羽.拉深筋约束力模型及试验研究[J]. 西安交通大学学报, 2006, 40(7): 819-822.
［7］李大永, 胡平, 李运兴. 拉伸筋阻力的一种简便解析模型[J]. 机械工程学报, 2000, 36(5):46-49.
［8］Meinders T, Carleer B D, Geijselaers H J M, et al. The implementation of an equivalent drawbead model in a finite-element code for sheet metal forming[J]. Journal of materials Processing Technology, 1998, 83(13):234-244.
［9］徐丙坤, 施法中. 板料冲压成形数值模拟中等效拉延筋模型的建立与实现[J]. 锻压技术, 2000, 25(4): 24-27.
［10］臼田松男, 石井良男. 薄板成形における破断预测：第4報[R]. 第38回塑性加工连合講演会, 1987.
［11］Wang Hu, Li Enying, Li Guang Yao. Optimization of drawbead design in sheet metal forming based on intelligent sampling by using response surface methodology[J]. Journal of Materials Processing Technology,2008,206(13):45-55.
［12］Naceur H, Guo Y Q, Batoz J L, et a1. Optimization of drawbead restraining forces and drawbead design in sheet metal forming process[J]. International Journal of Mechanical Sciences, 2001, 43(10): 2407-2434.

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