5182-O铝合金塑性成形性能表征

Characterization on Plastic Forming Properties of 5182-O Aluminum Alloy

目的结合复杂加载状态试验、塑性和损伤断裂本构模型及有限元应用,实现AA5182-O铝合金在复杂加载状态下塑性变形和损伤断裂行为的精确表征。方法通过拉伸、剪切等试验,研究5182-O在剪切、单向拉伸、平面应变拉伸等复杂应力状态下的力学性能,应用pDrucker方程来表征其复杂加载状态下的塑性变形和损伤断裂特性。采用逆向工程方法实现pDrucker屈服方程和pDrucker断裂准则的精确标定。将标定后的塑性本构模型和损伤断裂准则应用到ABAQUS/Explicit中,预测不同试件的塑性变形和损伤断裂情况。结果通过有限元模拟与试验结果的对比,发现有限元仿真准确预测了5182-O在复杂加载状态下的力-位移曲线和损伤断裂情况。结论有限元模拟与试验结果的对比表明,pDrucker方程可以实现5182-O铝合金在复杂加载状态下塑性成形性能的精确表征。标定的pDrucker方程可应用于5182-O冲压成形过程的有限元分析、模具设计和工艺优化中。

The work aims to precisely characterize the plastic deformation and damage fracture of AA5182-O aluminum alloy under complex stress states in combination with the test complex stress state,plastic and damage fracture constitutive model and finite element application method.Tensile and shear tests were conducted to study the mechanical properties of 5182-O under complex stress states of shear,uniaxial tension and plane strain tension.The plastic deformation and damage fracture behavior under complex stress states were characterized by the pDrucker equation.The accurate calibration of pDrucker yield equation and pDrucker fracture criterion was realized by reverse engineering method.The calibrated plastic constitutive model and damage fracture criterion were applied to ABAQUS/Explicit to predict the plastic deformation and damage fracture of different specimens.The comparison between finite element simulation and test results showed that the finite element simulation could accurately predict the stress-displacement curve and damage fracture of 5182-O under complex stress states.The comparison between finite element simulation and test results shows that pDrucker equation can accurately characterize the plastic formability of 5182-O aluminum alloy under complex stress states.The calibrated pDrucker equation can be applied to the finite element analysis,die design and process optimization of 5182-O stamping process.