Extension of the modified Bai-Wierzbicki model for predicting ductile fracture under complex loading conditions

B. Wu*, X. Li, Y. Di, V. Brinnel, J. Lian, S. Münstermann

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

18 Citations (Scopus)

Abstract

The ductile fracture behaviour of metallic materials is strongly dependent on the material's stress state and loading history. This paper presents a concept of damage initiation and failure indicators and corresponding evolution laws to enhance the modified Bai-Wierzbicki model for predicting ductile damage under complex loading conditions. The proposed model considers the influence of stress triaxiality and the Lode angle parameter on both damage initiation and the subsequent damage propagation. The model parameters are calibrated for C45E + N steel using a series of mechanical tests and numerical simulations. The enhanced approach is applied to the modelling of various mechanical tests under proportional and non-proportional loading conditions and successfully predicts the ductile damage behaviour in these tests.

Original languageEnglish
Pages (from-to)2152-2168
Number of pages17
JournalFatigue and Fracture of Engineering Materials and Structures
Volume40
Issue number12
DOIs
Publication statusPublished - 1 Dec 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • damage mechanics model
  • ductile fracture
  • non-proportional loading
  • stress state

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