Modeling hydrogen transport by dislocations

Mohsen Dadfarnia, May L. Martin, Akihide Nagao, Petros Sofronis, Ian M. Robertson

    研究成果: ジャーナルへの寄稿学術誌査読

    154 被引用数 (Scopus)


    Recent experimental studies of the microstructure beneath fracture surfaces of specimens fractured in the presence of high concentrations of hydrogen suggest that the dislocation structure and hydrogen transported by mobile dislocations play important roles in establishing the local conditions that promote failure. The experiments demonstrate that hydrogen is responsible for the copious plasticity in large volumes of material before the onset of fracture and further afield from a crack tip. A revised model for hydrogen transport that accounts for hydrogen carried by dislocations along with stress driven diffusion and trapping at other microstructural defects is proposed. With the use of this new model, numerical simulation results for transient hydrogen profiles in the neighborhood of a crack tip are presented. Based on hydrogen-enhanced dislocation mobility and density, the results indicate that dislocation transport can contribute to the elevation of the local hydrogen concentrations ahead of the crack to levels above those predicted by the classical diffusion model and to distributions that extend farther afield.

    ジャーナルJournal of the Mechanics and Physics of Solids
    出版ステータス出版済み - 12月 15 2014

    !!!All Science Journal Classification (ASJC) codes

    • 凝縮系物理学
    • 材料力学
    • 機械工学


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