AZ31镁合金板热成形中的屈服和损伤:本构实现与数值分析

doi:10.7527/S1000-6893.2017.21665

Abstract

Abstract: In order to predict the forming quality of the anisotropic magnesium alloy sheet accurately, a modified GTN damage model that incorporates anisotropic/asymmetric CPB06 yield criterion and yield locus evolution with the accumulated plastic strain, the so-called CPB06-GTN anisotropy yielding model with parametric evolution is developed. The modified CPB06-GTN model is implemented into a VUMAT subroutine for ABAQUS/Explicit, and the subroutine is then tested using a single unit. The results show that the simulation predictions are in good agreement with the experimental results in uniaxial tension and compression. Using the VUMAT subroutine, not only anisotropic yielding and irregular hardening but also damage and fracture of magnesium alloys can be well predicted. In addition, the corresponding VUMAT subroutine is compiled to simulate the warm deep drawing process of magnesium alloy, and the simulation results are compared with the experimental data. The results show that the anisotropic yield CPB06-GTN damage model can well predict the deformation and fracture of the magnesium alloy. The formability of magnesium alloys can be improved by adopting the proper blank holder force and forming temperature as well as non isothermal warm forming method.

Key words: magnesium alloy, warm stamping forming, thermal-mechanical coupling, anisotropic, GTN micro-damage model

CLC Number:

ZHOU Xia, WEN Dong, SHEN Mengqi, SONG Shangyu. Anisotropic yield and damage in warm forming of AZ31 magnesium alloy sheet: Implementation of constitutive model and numerical analysis[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2018, 39(5): 421665-421665.

References

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Anisotropic yield and damage in warm forming of AZ31 magnesium alloy sheet: Implementation of constitutive model and numerical analysis

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