铝合金板材渐进成形韧性破裂过程模拟
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摘要
针对铝合金板材渐进成形过程中材料受拉失稳产生韧性破裂的问题,建立考虑应变率效应的铝合金板材渐进成形韧性破裂准则。采用单向拉伸试验和有限元模拟相结合的方法,确定了铝合金板材渐进成形韧性破裂准则中的材料参数。以建立的破裂准则为破裂判断的依据,结合有限元软件MSC.Marc进行二次开发,通过嵌入韧性破裂子程序,实现了对1060铝合金板材渐进成形破裂过程的定量分析,并通过渐进成形试验进行了试验验证。结果表明,考虑应变率效应的韧性破裂准则适用于铝合金板材渐进成形破裂缺陷的预测,揭示了铝合金板材渐进成形过程中破裂产生的机制,有限元模拟结果与实验结果一致性较好。
In order to solve the problem of tensile failure of materials during the process of aluminum alloy sheet metal forming process,a rule for the fracture of aluminum alloy sheet metal forming with strain rate effect was established.The material parameters of the alloy sheet incremental forming toughness fracture criterion were determined by the method of uniaxial tensile test and finite element simulation.Based on the fracture criteria established,and the second development of the finite element software MSC.Marc,by embedding ductile fracture subprogram,the quantitative analysis of the fracture process of 1060 aluminum alloy sheet was realized,the experimental verification was carried out by incremental forming test.The results show that the ductility fracture criterion considering the strain rate effect is applicable to the prediction of the fracture defect of aluminum alloy sheet,the mechanism of fracture in the incremental forming process of aluminum alloy sheet is revealed.In addition,the simulation results are in good agreement with the experimental results.
In order to solve the problem of tensile failure of materials during the process of aluminum alloy sheet metal forming process,a rule for the fracture of aluminum alloy sheet metal forming with strain rate effect was established.The material parameters of the alloy sheet incremental forming toughness fracture criterion were determined by the method of uniaxial tensile test and finite element simulation.Based on the fracture criteria established,and the second development of the finite element software MSC.Marc,by embedding ductile fracture subprogram,the quantitative analysis of the fracture process of 1060 aluminum alloy sheet was realized,the experimental verification was carried out by incremental forming test.The results show that the ductility fracture criterion considering the strain rate effect is applicable to the prediction of the fracture defect of aluminum alloy sheet,the mechanism of fracture in the incremental forming process of aluminum alloy sheet is revealed.In addition,the simulation results are in good agreement with the experimental results.
引文
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[2]Grigob C,Racz G,Bologa O,et al.FEM simulation of laminated lightweight materials processed through single point incremental forming[J].Applied Mechanics&Materials Journal of Sound and Vibration,2015,772:38-43.
[3]Shim M S,Park J J.The formability of aluminum sheet in incremental forming[J].Journal of Materials Processing Technology,2001,113:654-658.
[4]Giuseppina A,Teresa C,Luigino F,et al.Numerical simulation of high speed incremental forming of aluminum alloy[J].Key Engineering Materials,2014,612(1):41-48.
[5]Arfa H,Bahloul R,Belhadjsalah H.Finite element modelling and experimental investigation of single point incremental forming process of aluminum sheets:influence of process parameters on punch force monitoring and on mechanical and geometrical quality of parts[J].International Journal of Material Forming,2013,6(4):483-510.
[6]Yamashita M,Gotoh M,Atsumi S Y.Numerical simulation of incremental forming of sheet metal[J].Journal of Materials Processing Technology,2008,199:163-172.
[7]Takuda H,Yoshii T,Hatta N.Finite element analysis of formability of a magnesium-based alloy AZ31 sheet[J].Journal of Material Processing Technology.1999,89-90(99):135-140.
[8]Oyane M,Sato T.Criteria for ductile fracture and their application.[J].Journal of Mechanical Working and Technology,1980,4:65-81.
[9]李磊,周晚林,Hussain G.金属板料单点渐进成形极限的数值模拟预测[J].机械工程学报,2010,46(18):102-107.
[10]苌群峰,彭颖红,杜朝辉.镁合金板材温热成形韧性破裂准则[J].机械工程学报,2009,45(10):294-299.
[11]高付海,桂良进,范子杰.基于韧性准则的金属板材冲压成形断裂模拟[J].工程力学,2010,27(2):204-208.