Near-tip behavior of ductile, steady-state crack growth in a hydrogen charged material

R. H. Dodds, J. C. Sobotka, P. Sofronis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This study examines the influence of increased dislocation velocity due to hydrogen on the steady-state behavior of a crack propagating under quasi-static conditions in elastic-plastic, matched, over-matched, and under-matched weld materials. Finite element analyses in a small-scale yield setting with plane strain conditions resolve the near-tip fields under the remotely applied K I - T displacement fields. The constitutive model incorporates hydrogen induced dilation and softening effects on the inelastic behavior of the ductile material representative of a pressure vessel steel. Near the crack tip, the hydrogen concentration, triaxiality, and plastic strain depend on the remote loading, the extent of material softening, and the initial concentration of hydrogen in the weld and base metal. A simple measure of damage along the uncracked ligament predicts higher values of ductile void growth in the presence of hydrogen and implies lower resistance to crack advancement.

Original languageEnglish
Title of host publication12th International Conference on Fracture 2009, ICF-12
Pages1148-1157
Number of pages10
Publication statusPublished - Dec 1 2009
Externally publishedYes
Event12th International Conference on Fracture 2009, ICF-12 - Ottawa, ON, Canada
Duration: Jul 12 2009Jul 17 2009

Publication series

Name12th International Conference on Fracture 2009, ICF-12
Volume2

Other

Other12th International Conference on Fracture 2009, ICF-12
CountryCanada
CityOttawa, ON
Period7/12/097/17/09

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology

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  • Cite this

    Dodds, R. H., Sobotka, J. C., & Sofronis, P. (2009). Near-tip behavior of ductile, steady-state crack growth in a hydrogen charged material. In 12th International Conference on Fracture 2009, ICF-12 (pp. 1148-1157). (12th International Conference on Fracture 2009, ICF-12; Vol. 2).