Numerical modelling of magnesium die-castings using stochastic fracture parameters


Dorum C., Hopperstad O. S. , Berstad T., DIŞPINAR D.

ENGINEERING FRACTURE MECHANICS, cilt.76, ss.2232-2248, 2009 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 76 Konu: 14
  • Basım Tarihi: 2009
  • Doi Numarası: 10.1016/j.engfracmech.2009.07.001
  • Dergi Adı: ENGINEERING FRACTURE MECHANICS
  • Sayfa Sayısı: ss.2232-2248

Özet

Quasi-static material tests using specimens cut from a generic cast component are performed to study the behaviour of the high-pressure die-cast magnesium alloy AM60 under different stress states. The experimental data set is applied to establish a validated probabilistic methodology for finite element modelling of thin-walled die-castings subjected to quasi-static loading. The test specimens are modelled in the explicit finite element (FE) code LS-DYNA using shell elements. The cast magnesium alloy AM60 is modelled using an elasto-plastic constitutive model including a high-exponent, isotropic yield criterion, the associated flow law and isotropic hardening. To simulate fracture, the Cockcroft-Latham fracture criterion is adopted, and the fracture parameter is chosen to follow a modified weakest-link Weibull distribution. Comparison between the experimental and predicted behaviour of the cast magnesium specimens gives very promising results. (C) 2009 Elsevier Ltd. All rights reserved.