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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。
The Oyan ductile fracture criterion is introduced into numerical simulation to predict the sheet forming limit (FLD). The influence of anisotropy coefficient on each of the criteria in different strain states is discussed. The material constants in the criterion are determined by measuring the strain at break of uniaxial tension and plane strain stretching. The simulation bulge bulging experiment obtains each time step stress, the strain value, substitutes the ductile fracture criterion to predict the sheet forming limit. The forming limit of aluminum alloy A5182-O and SPCC was predicted by Oyan ductile fracture criterion. The simulation results show that the combination of ductile fracture criterion and numerical simulation can successfully predict the forming limit of sheet metal.