6000系铝合金薄壁结构压缩断裂行为的有限元模拟
Finite Element Modeling for Compression Fracture Behavior of 6000 Aluminum Alloys Thin-Walled Structure
摘 要
针对汽车用6061和6063铝合金薄壁结构, 先进行了准静态拉伸试验和180°弯曲试验, 得到了铝合金的真应力-真应变曲线; 然后采用线性回归拟合的方法建立了铝合金韧性断裂的本构模型, 在此基础上, 建立了铝合金薄壁结构压缩失效的有限元模型, 并通过轴向压缩试验验证了有限元模型的准确性。结果表明: 拉伸后, 6061铝合金的表面呈橘皮形貌, 6063铝合金的表面比较光滑; 两种铝合金的断裂均为韧性断裂, 6063铝合金具有更好的韧性; 6061和6063铝合金的韧性断裂准则参数分别为104.81 MPa和179.91 MPa; 有限元预测得到的铝合金薄壁结构的失效行为与试验结果比较吻合, 证明了铝合金韧性断裂本构模型的正确性。
薄壁结构
韧性断裂
本构模型
aluminum alloy
thin-walled structure
ductile fracture
constitutive model
Abstract
According to the thin-walled structure of 6061 and 6063 aluminum alloys, the true stress-strain curve were obtained by quasi-static tensile test and 180 degree bending experiment, and then, the constitutive model for ductile fracture was established by linear regression fitting. On this basis, compression failure finite element model for aluminum alloy thin-walled structure was built, and the accuracy of the finite element model was verified by axial compression test. The results show that the surface of 6061 aluminum alloy was peel morphology, while the surface of 6063 aluminum alloy was smooth; the fracture modes of two kinds of aluminum alloys were ductile fracture; the toughness of 6063 aluminum alloy was better than that of 6061 aluminum alloy; the parameters of fracture model of 6061 and 6063 aluminum alloys were 104.81 MPa and 179.91 MPa; the failure behavior of aluminum alloy thin-walled structure obtained by simulation and experiment were in good agreement, which indicated that the ductile fracture constitutive model of aluminum alloys was accurate.
中图分类号 TG146.21 DOI 10.11973/jxgccl201607017
所属栏目 物理模拟与数值模拟
基金项目 国家自然科学基金面上资助项目(51475156); 宁夏大学自然科学研究基金资助项目(ZR1403); 宁夏大学人才引进科研启动基金资助项目(BQD2014018); 湖南大学汽车车身先进设计制造国家重点实验室开放基金资助项目(31515007)
收稿日期 2015/6/8
修改稿日期 2016/5/20
网络出版日期
作者单位点击查看
备注王冠(1985-), 男, 河南郑州人, 讲师, 博士。
引用该论文: WANG Guan,KOU Lin-yuan,XU Cong-chang,YE Tuo,LI Luo-xing. Finite Element Modeling for Compression Fracture Behavior of 6000 Aluminum Alloys Thin-Walled Structure[J]. Materials for mechancial engineering, 2016, 40(7): 73～80
王冠,寇琳媛,徐从昌,叶拓,李落星. 6000系铝合金薄壁结构压缩断裂行为的有限元模拟[J]. 机械工程材料, 2016, 40(7): 73～80
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参考文献
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【2】GOODWIN G M, MCTALL L. Application of strain analysis to sheet metal forming problems in the press shop［C］//SAE Technical Paper.［S.l.］: SAE, 1968: 380-388.
【3】STOUGHTON T B. Stress-based forming limits in sheet-metal forming［J］. Journal of Engineering Materials & Technology, 2001, 123(4): 417-422.
【4】WANG Z T. Forming limits for sheet metals under tensile stresses［J］. Journal of Materials Processing Technology, 1997, 71: 418-421.
【5】ZENG D, CHAPPUIS L, XIA Z C, et al. A path independent forming limit criterion for sheet metal forming simulations［J］. SAE International Journal of Materials & Manufacturing, 2008, 1(1): 809-817.
【6】曹宏深. 复合变形路径下的板材冲压成形极限应变(I)-冲压成形极限应变的立论与解析［J］. 机械工程学报, 2008, 44(2): 54-61.
【7】NARASIMHAN K. A novel criterion for predicting forming limit strains［C］// Proceedings of NUMIFORM′ 2004.［S.l.］: ［s.n.］, 2004: 850-855.
【8】HOU B, LIN Z Q, LI S H, et al. Prediction of forming limit in virtual sheet metal forming based on thickness gradient criterion［C］//Proceedings of NUMISHEET′ 2008. Interlaken, Switzerland: ［s.n.］, 2008: 253-257.
【9】JOHNSON G R, COOK W H. Fracture characteristics of three metals subjected to various strains, strain rates, temperatures and pressures［J］. Engineering Fracture Mechanics, 1985, 21: 31-48.
【10】郑长卿, 周利, 张克实. 金属韧性破坏的细观力学及其研究应用［M］. 北京: 国防工业出版社, 1995: 130-157.
【11】FREUDENTHAL A M. The inelastic behavior of engineering materials and structures［M］.New York: Wiley, 1950, 216-279.
【12】COCKCROFT M G, LATHAM D J. Ductility and the workability of metals［J］. Journal of the Institute of Metals, 1968, 96: 33-39.
【13】WILIKINS M L, STREIT R D, REAUGH J E. Cumulative strain damage model of ductile fracture: simulation and prediction of engineering fracture tests［C］//UCRL-53058. California: Lawrence Livermore Laboratory, 1980: 1-65.
【14】LEMAITRE J. A continuous damage mechanics model for ductile fracture［J］. Journal of Engineering Materials and Technology, 1985, 107: 83-89.
【15】黄建科, 董湘怀. 金属韧性断裂准则的数值模拟和试验研究［J］. 材料科学与工艺, 2010, 18(4): 450-454.
【16】虞松, 冯维明, 王戎. 金属韧性断裂准则的实验研究［J］. 锻压技术, 2010, 35(1): 121-124.
【17】王在林, 韩飞, 刘继英, 等. 韧性断裂准则在超高强钢辊弯成形工艺中的应用［J］. 塑性工程学报, 2012, 19(4): 16-20.
【18】周里群, 李健, 毛昭明, 等. 基于韧性断裂准则用有限元方法预测镍涂层薄钢板的成形极限［J］. 机械工程材料, 2015, 39(2): 103-107.
【19】郎利辉, 杨希英, 刘康宁, 等. 一种韧性断裂准则中材料常数的计算模型及其应用［J］. 航空学报, 2015, 36(2): 672-679.
【20】胡星, 杨海军. 基于韧性断裂的汽车用铝合金板滚压包边成形开裂预测［J］. 机械工程材料, 2014, 38(2): 93-97.
【21】于忠奇, 杨玉英, 王永志, 等. 基于韧性断裂准则的铝合金板材成形极限预测［J］. 中国有色金属学报, 2003, 13(5): 1223-1226.
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