Modified Johnson-Cook Constitutive Model of Aerial Aluminum Alloy 7050-T7415 Considering the Forming Direction Effect

doi:10.3901/JME.2018.22.078

Abstract

Abstract: In order to accurately reflect the influence of the forming direction of materials on its dynamic mechanical properties, Quasi-static and dynamic impact shear tests of aerial aluminum alloy 7050-T7451 with different forming directions (rolling direction RD, transverse direction TD and normal direction ND) are performed by electronic universal testing machine and Split Hopkinson Pressure Bar (SHPB). The results show that the forming directions is one of the important factors that affect the quasi-static and dynamic mechanical properties of material. And the material has a certain strain rate sensitivity and positive strain rate strengthening effect in the process of dynamic impact shear. Based on the influence of the forming direction of the material, the modified Johnson-Cook constitutive model based on the strain rate sensitivity item is constructed. The comparison of the results of the modified constitutive model and experimental data proves that the modified constitutive model considering the strain rate sensitivity is more suitable for dynamic mechanical properties of the material under different forming directions. The model can provide data support for establishing accurate and reliable simulation models of anisotropic materials.

Key words: aerial aluminum alloy 7050-T7451, constitutive model, dynamic impact shear, forming direction

CLC Number:

TG115

MENG Ying, FU Xiuli, PAN Yongzhi, XU Nianwei. Modified Johnson-Cook Constitutive Model of Aerial Aluminum Alloy 7050-T7415 Considering the Forming Direction Effect[J]. Journal of Mechanical Engineering, 2018, 54(22): 78-85.

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