A PROBABILISTIC APPROACH FOR MODELLING OF FRACTURE IN MAGNESIUM DIE-CASTINGS

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

METALLURGIA ITALIANA, sa.3, ss.51-54, 2009 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: Sayı: 3
  • Basım Tarihi: 2009
  • Dergi Adı: METALLURGIA ITALIANA
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex
  • Sayfa Sayıları: ss.51-54
  • İstanbul Üniversitesi Adresli: Evet

Özet

Quasi-static tensile tests with specimens cut from a generic cast component are performed to characterise the mechanical behaviour of the high-pressure die cast)magnesium alloy AM60. The experimental data is used to establish a probabilistic methodology for finite element modelling of thin-walled die castings subjected to quasi-static loading, The cast magnesium alloy AM60 is described using an elastic-plastic constitutive model consisting of a high-exponent, isotropic yield criterion, the associated flow law? and all isotropic hardening rule. A novel probabilistic approach for modelling of fracture In thin-walled magnesium die-castings using finite element analysis is developed. The Cockcroft-Latham criterion for ductile fracture is adopted with the fracture parameter assumed to follow a modified weakest link Weibull distribution. Comparison between the experimental and predicted behaviour of the cast magnesium tensile specimens gives very promising results.