Flow Stress Curve Modeling of Bake-Hardening A6111 Aluminum Alloy

Abstract

Abstract:

The forming history should be taken into consideration to get more precise numeric simulation results in car crash simulations. In this paper the A6111T4P aluminum alloy sheet metal underwent different prestraining and baking treatment. Then tensile tests were conducted to obtain flow stress curves. The HS flow stress model was selected and key factors influencing the fitting parameters in the HS model were analyzed using the method of inductive statistics based on experimental results. Finally, a novel flow stress model for aluminum alloy related to prestrain and baking was built.

Key words: pre-strain, baking, flow stress model, A6111 aluminum alloy

CLC Number:

TG 386.4

LI Jiangchuan1,CHEN Jun1,CHEN Jieshi1,XIA Cedric2,ZENG Danielle2. Flow Stress Curve Modeling of Bake-Hardening A6111 Aluminum Alloy[J]. Journal of Shanghai Jiaotong University, 2013, 47(11): 1680-1684.

References

［1］Miller W S, Zhuang L, Bottema J, et al. Recent development in aluminium alloys for the automotive industry［J］. Materials Science and Engineering: A, 2000, 280(1): 3749.

［2］王孟君, 黄电源, 姜海涛.汽车用铝合金的研究进展［J］. 金属热处理, 2006, 31(9): 3539.

WANG Mengjun, HUANG Dianyuan, JIANG Haitao. Research progress of Alluminum alloys for the automotive industry［J］. Heat treatment of metal, 2006, 31(9):3539.

［3］关绍康,姚波,王迎新.汽车铝合金车身板材的研究现状及发展趋势［J］.机械工程材料,2001,25(5):1214.

GUAN Shaokang, YAO Bo, WANG Yingxin. The progress and prospect of research on Aluminum alloys for auto body sheets［J］. Materials for mechanical engineering, 2001, 25(5): 1214.

［4］Dehghani K, Nekahi A, Mirzaie MAM. Optimizing the bake hardening behavior of Al7075 using response surface methodology［J］. Materials & Design, 2010, 31(4): 17681775.

［5］Dehghani K, Shafiei A. Predicting the bake hardenability of steels using neural network modeling［J］. Materials Letters, 2008, 62(2): 173178.

［6］Zhang J, Fu R, Zhang M, et al. Bake hardening behavior of TRIP and DP steels［J］. Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material, 2008, 15(2):132137.

［7］陈晓东, 尹同耀, 朱西产, 等.汽车侧面碰撞计算机仿真方法［J］. 汽车工程, 2004, 26(1): 6569.

CHEN Xiaodong, YIN Tongyao, ZHU Xichan, et al. A computer simulation on vehicle side crash［J］. Automotive engineering, 2004, 26(1): 6569.

［8］董万鹏, 陈军. 不锈钢流动应力模型分析［J］. 计算机仿真, 2010, 27(4): 8083.

DONG Wanpeng, CHEN Jun. Analysis for flow stress models of stainless Steel［J］. Computer simulation, 2010, 27(4): 8083.

［9］李宏烨, 庄新村, 赵震. 材料常用流动应力模型研究［J］. 模具技术, 2009(5): 14.

LI Hongye, ZHUANG Xincun, ZHAO Zhen. Research on material flow stress models in common use［J］. Die and Mold technology, 2009(5): 14.

［10］Dziallach S, Bleck W, Blumbach M, et al. Sheet Metal Testing and Flow Curve Determination under Multiaxial Conditions［J］. Advanced Engineering Materials, 2007, 9(11): 987994.

［11］Hollomon J H. Tensile deformation［J］. AIME TRANS, 1945, 12(4): 122.

［12］Voce E. The relationship between stress and strain for homogeneous deformation［J］. Journal Institute of Metals, 1948, 74: 537562.

［13］Ghosh A K. A numerical analysis of the tensile test for sheet metals［J］. Metallurgical and Materials Transactions A, 1977, 8(8): 12211232.

［14］Werber A, Liewald M. Influence of prestrain and heat treatment on mechanical properties of aluminum sheet［J］. International Journal of Material Forming, 2012, 5(4): 307315.

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