Hydrogen/Plasticity Interactions at an Axial Crack in Pipeline Steel

    Volume 5, Issue 6 (June 2008)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 24 June 2008

    Page Count: 16


    Dadfarnia, M.
    Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL

    Sofronis, P.
    Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL

    Somerday, B. P.
    Sandia National Laboratories, Livermore, CA

    Robertson, I. M.
    Department of Material Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL

    (Received 14 November 2007; accepted 14 May 2008)

    Abstract

    The technology of large scale hydrogen transmission from central production facilities to refueling stations and stationary power sites is at present undeveloped. Among the problems which confront the implementation of this technology is the deleterious effect of hydrogen on structural material properties, in particular at gas pressure of 15 MPa which is the desirable transmission pressure suggested by economic studies for efficient transport. To investigate the hydrogen embrittlement of pipelines, a hydrogen transport methodology for the calculation of hydrogen accumulation ahead of a crack tip in a pipeline steel is outlined. This work addresses the interaction of hydrogen with an axial crack on the inside surface of the pipe. The approach accounts for stress-driven transient diffusion of hydrogen and trapping at microstructural defects whose density evolves dynamically with deformation. The results address the effect of hydrostatic constraint, stress, and plastic strain on the time it takes for the steady state hydrogen profiles to be established.


    Paper ID: JAI101531

    DOI: 10.1520/JAI101531

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    Author
    Title Hydrogen/Plasticity Interactions at an Axial Crack in Pipeline Steel
    Symposium Seventh International ASTM/ESIS Symposium on Fatigue and Fracture Mechanics (36th ASTM National Symposium on Fatigue and Fracture Mechanics), 2007-11-16
    Committee E08