4.6 Article

Evaluation on prediction abilities of constitutive models considering FEA application

期刊

JOURNAL OF CENTRAL SOUTH UNIVERSITY
卷 25, 期 6, 页码 1251-1262

出版社

JOURNAL OF CENTRAL SOUTH UNIV TECHNOLOGY
DOI: 10.1007/s11771-018-3822-8

关键词

constitutive model; metal forming; numerical simulation; performance; isothermal compression

资金

  1. National Key Technology R&D Program of China [2012ZX04010-81]
  2. National Natural Science Foundation of China [51575066]

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Constitutive model plays an important role in the numerical simulations of metal forming. However, the influence of the models on the calculation is vague. Based on the stress-strain data of Al 7050 and Ti-6Al-4V alloys generated by isothermal compressive tests, the Johnson-Cook (JC) and Arrhenius-type (A-type) hyperbolic sine models were fitted to obtain the constants. Flow stresses directly calculated by the equations were compared with the experiment results, and rigid-plastic finite element analyses (FEA) utilizing these models were employed to simulate the same compression processes. The results show that A-type model has higher accuracy in the direct prediction of flow stress, even outside of the fit domain. The simulation results using A-type model also have higher agreement with the experiment; however, the suitability is affected by the referential parameters employed in the regression process. In terms of the overall deformation and strain distributions, there are slight differences among the simulation results using these two models.

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