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摘要：
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将Oyan韧性断裂准则引入数值模拟预测板料的成形极限图(FLD)。讨论了各向异性系数对不同应变状态下准则中各项的影响,通过测定单向拉伸和平面应变拉伸的断裂应变确定了准则中的材料常数。模拟凸模胀形实验得到每一时间步应力、应变值,代入韧性断裂准则预测板料的成形极限。应用Oyan韧性断裂准则预测了铝合金A5182-O和SPCC的成形极限图。模拟结果表明,用韧性断裂准则和数值模拟相结合能成功预测板料的成形极限图。
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To predict the forming limit diagrams(FLD) of sheet metals,Oyan ductile fracture criterion was introduced into numerical simulation.The influence of normal anisotropic coefficient on the item in different strains of the criterion were discussed and material constants in the criterion were obtained by testing the fracture strains of uniaxial tensile and plan strain stretching.The forming limit was predicted in the male punch bulging test by substituting the values of stress and strain of every time step obtained from numerical simulation into ductile fracture criterion.Oyan ductile fracture criterion was applied to predict the FLD of A5182-O and SPCC.The results indicate that the combination of ductile fracture criterion and numerical simulation can successfully predict the forming limit diagram of sheet metals.
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基金项目：
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作者简介：
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参考文献：
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