基于恒应变率控制的椭圆凹模胀形试验方法

孙智甲; 杨希英; 郎利辉

doi:10.13700/j.bh.1001-5965.2015.0653

基于恒应变率控制的椭圆凹模胀形试验方法

doi: 10.13700/j.bh.1001-5965.2015.0653

1.
兰州理工大学机电工程学院, 兰州 730050
2. 河南理工大学机械与动力工程学院, 焦作 454000
3. 北京航空航天大学机械工程及自动化学院, 北京 100083

基金项目: 国家自然科学基金(51175024)

详细信息

作者简介:
孙智甲男,博士,讲师。主要研究方向:数值模拟在金属材料动态损伤及金属成形加工中的应用。E-mail:sunzhijia2004@163.com

通讯作者:
孙智甲,E-mail:sunzhijia2004@163.com

中图分类号: V260.1;TG394
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- 被引次数: 0
出版历程
- 收稿日期: 2015-10-09
- 网络出版日期: 2016-05-20

Test method of elliptical hydraulic bulging based on constant strain rate

1.
Mechanical and Electrical Engineering Institute, Lanzhou University of Technology, Lanzhou 730050, China
2. School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454000, China
3. School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

摘要

摘要: 为确定2A16-O铝合金板材在不同温度及应变率下的成形极限曲线(FLCs),应用改进Hollomon公式获取满足外插可靠度的拟合应力应变,通过有限元分析(FEA)不同椭圆度的椭圆凹模胀形破裂位置,优化工艺参数得到指定应变路径下的成形极限点,建立了液体压力与等效应变及应变率的公式,推导出压力变化率与应变率的定量关系。以应变率控制的椭圆凹模胀形与单拉试验相结合,获得2A16-O铝合金板材在不同温度及应变率下的FLCs,为定量分析应变率的影响规律和评判理论预测方法的准确性提供了依据。
- 铝合金板 /
- 成形极限曲线 /
- 椭圆凹模胀形 /
- 应变率 /
- 压力变化率
Abstract: To determine the forming limit curves (FLCs) of 2A16-O aluminum alloy sheet at various temperatures and strain rates, a modified Hollomon equation is put forward to acquire the fitted true stress-true strain curve. Through finite element analysis (FEA), the fracture position in elliptical hydraulic bulging with different ovality was obtained. The forming limit data in specified strain path were determined by optimizing the process parameters. The quantitative relation between pressure rate and strain rate was derived by establishing the formula of liquid pressure, equivalent strain and strain rate. By combining the uniaxial tensile with elliptical hydraulic bulging which is controlled by the constant strain rate, the FLCs of 2A16-O aluminum alloy sheet at different temperatures and strain rates were acquired. The above method provides the criterion for quantitatively analyzing the influence rule of strain rate on FLCs and evaluating which theoretical method is more accurate to predict FLCs.
- aluminum alloy sheet /
- forming limit curve /
- elliptical hydraulic bulging /
- strain rate /
- pressure variation rate

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参考文献(16)

[1]	张珏.铝合金在航天航空中的应用[J].铝加工,2009(3):50-52. ZHANG Y.The application of aluminum alloy in aerospace field[J].Aluminum Fabrication,2009(3):50-52(in Chinese).
[2]	KIM H S,KOC M,NI J,et al.Analysis of warm forming of aluminum alloys-validation through comparisons with experiment and determination of a failure criterion[J].Journal of Manufacturing Science and Engineering,2006,128(3):613-621.
[3]	LI D M,GHOSH A.Tensile deformation behavior of aluminum alloys at warm forming temperature[J].Materials Science and Engineering A,2003,352(1-2):279-286.
[4]	杨希英,郎利辉,刘康宁,等.基于修正M-K模型的铝合金板材成形极限图预测[J].北京航空航天大学学报,2015,41(4):675-679. YANG X Y,LANG L H, LIU K N,et al.Prediction of forming limit diagram of AA7075-O aluminum alloy sheet based on modified M-K model[J].Journal of Beijing University of Aeronautics and Astronautics,2015,41(4):675-679(in Chinese).
[5]	SWIFT H W.Plastic instability under plane stress[J].Journal of the Mechanics and Physics of Solid,1952,1(1):1-18.
[6]	HILL R.On discontinuous plastic states with special reference to localized necking in thin sheets[J].Journal of Mechanics and Physics of Solids,1952,1(1):19-31.
[7]	MARCINIAK Z,KUCZYNSKI K.Limit strains in the processes of stretch-forming sheet metal[J].International Journal of Mechanical Science,1967,9(3):609-620.
[8]	陈劼实,周贤宾.成形极限预测韧性断裂准则及屈服准则的影响[J].北京航空航天大学学报,2006,32(8):969-973. CHEN J S,ZHOU X B.Suitability of some ductile fracture criteria and yield criteria in forming limit prediction[J].Journal of Beijing University of Aeronautics and Astronautics,2006,32(8):969-973(in Chinese).
[9]	万敏,胡运斌,谢英,等.飞机蒙皮铝合金板材成形极限及应用[J].中国有色金属学报,2002,12(AL Special):180-183. WAN M,HU Y B,XIE Y,et al.Forming limit of aircraft skin aluminum alloy sheets and its applications[J].The Chinese Journal of Nonferrous Metals,2002,12(AL Special):180-183(in Chinese).
[10]	RAGHAVAN K S.A simple technique to generate in-plane forming limit curve and selected applications[J].Metallurgical and Materials Transactions A,1995,26A(8):2075-2084.
[11]	FERRON G,MAKINDE A.Design and development of a biaxial strength testing device[J].Journal of Testing and Evaluation,1988,16(3):253-256.
[12]	李春峰,李雪春,杨玉英.椭圆凹模液压胀形法制作成形极限图[J].材料科学与工艺,1996,4(2):101-105. LI C F,LI X C,YANG Y Y.Study on forming limit diagram by bulging with elliptic die[J].Material Science & Technology,1996,4(2):101-105.
[13]	L Z RESCU L,COM A D S,NICODIM I,et al.Characterization of plastic behaviour of sheet metals by hydraulic bulge test[J].Transactions of Nonferrous Metals Society of China,2012,22(S2):275-279.
[14]	BARATA DA ROCHA A,SANTOS A D,TELXEIRA P,et al.Analysis of plastic flow localization under strain paths changes and its coupling with flnite element simulation in sheet metal forming[J].Journal of Materials Processing Technology,2009,209(11):5097-5109.
[15]	MITUKIEWICZA G,ANANTHESHWARA K,ZHOU G,et al.A new method of determining forming limit diagram for sheet materials by gas blow forming[J].Journal of Materials Processing Technology,2014,214(12):2960-2970.
[16]	KOC P,STOK B.Computer-aided identification of the yield curve of a sheet metal after onset of necking[J].Computational Materials Science,2004,31(1-2):155-168.