吉林大学学报(工学版) ›› 2014, Vol. 44 ›› Issue (2): 409-414.doi: 10.13229/j.cnki.jdxbgxb201402021

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Prediction of FLD for AA7075 under hot stamping based on continuum damage mechanics

ZHUANG Wei-min, CAO De-chuang, YE Hui   

  1. State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, China
  • Received:2013-03-14 Online:2014-02-01 Published:2014-02-01

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Abstract:

In view of the limitation of the Forming Limit Diagram (FLD), which is used to evaluate the formability of AA7075 under hot stamping conditions, the continuum damage mechanics was introduced into the prediction of the FLD. A set of uniaxial damage constitutive equations was presented and the material constants were optimized. Based on the analysis of the features of Forming Limit Curves (FLCs) for AA7075 at different temperatures, a plane-stress damage equation was proposed to take account of the damage of material at different stress-strain state. Then the FLCs were predicted on the condition of four sets of temperatures and three sets of strain rates. The results indicate that the stress-strain curves of the numerical analysis of uniaxial damage constitutive equation and the experimental curves are basically consistent. Using the plane-stress unified viscoplastic damage constitutive equations can predict the FLD at different temperature and strain rate in the hot stamping process and provide the failure criteria.

Key words: materials synthesis and processing technology, solid-state mechanics, constitutive equation, 7075 aluminum alloy, forming limit diagram, hot stamping

CLC Number: 

  • TG146

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