Investigation on the ductile fracture of high-strength pipeline steels using a partial anisotropic damage mechanics model

Fuhui Shen, Sebastian Muenstermann, Junhe Lian*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

A hybrid experimental and numerical investigation has been conducted to comprehensively characterize the anisotropic plasticity and ductile fracture behavior of a high-strength pipeline steel. Tensile tests have been performed on various flat specimens along three different loading directions to collect the experimental mechanical data covering a wide range of stress states. For numercial modeling, the anisotropic plastic deformation is described by the evolving non-associated Hill48 (enHill48) plasticity model considering anisotropic/distortional hardening and evolution of r-value. Based on the enHill48 model, in this study, an anisotropic damage mechanics model with consideration of the evolution of anisotropy and stress states has been proposed and calibrated to predict the anisotropic damage and fracture of the investigated material. It is concluded that the anisotropic hardening is critical for an accurate prediction of the ductile fracture. The proposed model has achieved good predictive capability for anisotropic fracture behavior.

Original languageEnglish
Article number106900
Number of pages23
JournalEngineering Fracture Mechanics
Volume227
DOIs
Publication statusPublished - 15 Mar 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Anisotropy
  • Evolving plasticity model
  • Damage
  • Ductile fracture
  • Pipeline steel
  • NONASSOCIATED FLOW RULE
  • STRESS YIELD FUNCTION
  • BAI-WIERZBICKI MODEL
  • LOCALIZED NECKING
  • FAILURE BEHAVIOR
  • STRAIN RATES
  • PLASTICITY
  • PREDICTION
  • CRITERION
  • EVOLUTION

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