Modeling issues on hydrogen-induced intergranular cracking under sustained load

M. Dadfarnia, P. Sofronis, B. P. Somerday, J. B. Liu, D. D. Johnson, I. M. Robertson

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

12 Citations (Scopus)

Abstract

The study of hydrogen embrittlement of materials has not as of yet led to methods that can be used to design safe and reliable hydrogen containment components in which hydrogen-induced degradation is associated with subcritical crack growth. For example, current design guidelines for pipelines only tacitly address subcritical cracking by applying arbitrary, conservative safety factors on the applied stress. In an effort to understand the mechanics of sustained-load cracking in a gaseous hydrogen environment, we investigate crack propagation in the Fe-Ni-Co superalloy IN903 for which experiments by Moody et al. [1] suggest that hydrogen promotes failure by intergranular cracking at pressures greater than 100MPa. In the present work, we model the hydrogen effect on grain boundary cohesion through the thermodynamic theory of Mishin et al. [2] which addresses transient separation accounting for the rate of hydrogen diffusion into the separating interface. We calibrate the parameters of the theory through first-principles calculations and information from the experiments and we simulate crack propagation by cohesive finite element methodology. The results reveal a number of issues related to the complexity of the failure mechanism and the robustness of the cohesive element methodology.

Original languageEnglish
Title of host publicationProceedings of the 2008 International Hydrogen Conference - Effects of Hydrogen on Materials
Pages613-621
Number of pages9
Publication statusPublished - Dec 1 2009
Externally publishedYes
Event2008 International Hydrogen Conference - Effects of Hydrogen on Materials - Jackson, WY, United States
Duration: Sep 7 2008Sep 10 2008

Publication series

NameProceedings of the 2008 International Hydrogen Conference - Effects of Hydrogen on Materials

Other

Other2008 International Hydrogen Conference - Effects of Hydrogen on Materials
CountryUnited States
CityJackson, WY
Period9/7/089/10/08

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All Science Journal Classification (ASJC) codes

  • Materials Chemistry
  • Nuclear and High Energy Physics
  • Atomic and Molecular Physics, and Optics

Cite this

Dadfarnia, M., Sofronis, P., Somerday, B. P., Liu, J. B., Johnson, D. D., & Robertson, I. M. (2009). Modeling issues on hydrogen-induced intergranular cracking under sustained load. In Proceedings of the 2008 International Hydrogen Conference - Effects of Hydrogen on Materials (pp. 613-621). (Proceedings of the 2008 International Hydrogen Conference - Effects of Hydrogen on Materials).