A phase-field regularized cohesive zone model for hydrogen assisted cracking

Jian Ying Wu, Tushar Kanti Mandal, Vinh Phu Nguyen

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Being able to seamlessly deal with complex crack patterns like branching, merging and even fragmentation, phase-field fracture/damage models are promising in the modeling of localized failure in solids. This paper addresses a phase-field regularized cohesive zone model (PF-CZM) for hydrogen assisted cracking based on our previous work on purely mechanical problems. Two distinct hydrogen enhanced decohesion mechanisms are dealt with by introducing various implicitly defined (via the crack phase-field) hydrogen-dependent softening laws. The resulting models are then numerically tested and compared against several benchmark examples. It is found that, though the PF-CZM gives different results regarding various decohesion mechanisms, the global responses are insensitive to both the mesh discretization resolution and the incorporated length scale parameter even in the presence of hydrogen.

Original languageEnglish
Article number112614
Number of pages22
JournalComputer Methods in Applied Mechanics and Engineering
Volume358
DOIs
Publication statusPublished - 1 Jan 2020

Keywords

  • Damage
  • Fracture
  • Hydrogen assisted cracking
  • Hydrogen embrittlement
  • Phase-field theory

Cite this

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A phase-field regularized cohesive zone model for hydrogen assisted cracking. / Wu, Jian Ying; Mandal, Tushar Kanti; Nguyen, Vinh Phu.

In: Computer Methods in Applied Mechanics and Engineering, Vol. 358, 112614, 01.01.2020.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Mandal, Tushar Kanti

AU - Nguyen, Vinh Phu

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AB - Being able to seamlessly deal with complex crack patterns like branching, merging and even fragmentation, phase-field fracture/damage models are promising in the modeling of localized failure in solids. This paper addresses a phase-field regularized cohesive zone model (PF-CZM) for hydrogen assisted cracking based on our previous work on purely mechanical problems. Two distinct hydrogen enhanced decohesion mechanisms are dealt with by introducing various implicitly defined (via the crack phase-field) hydrogen-dependent softening laws. The resulting models are then numerically tested and compared against several benchmark examples. It is found that, though the PF-CZM gives different results regarding various decohesion mechanisms, the global responses are insensitive to both the mesh discretization resolution and the incorporated length scale parameter even in the presence of hydrogen.

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