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Seminars

Finite Element Implementation of an Elastoplastic Constitutive Equation in the Presence of Hydrogen

Hold Date
2010-12-21 15:30〜2010-12-21 17:00
Place
2nd floor lecture room 16, Open Learning Plaza , Ito Campus
Object person
 
Speaker
LIU, Lijun (Kyushu Univ.)

co-authors: MIRESMAEILI, Reza; OGINO, Masao; KANAYAMA, Hiroshi


summary:  Hydrogen-enhanced localized plastiticity (HELP) is recognized
        as a viable mechanism of hydrogen embrittlement. A possible
        way by which the HELP mechanism can bring about macroscopic
        material failure is through hydrogen-induced cracking. In this
        work, according to the HELP theory, a constitutive formulation
        for elastoplasticity model in the presence of hydrogen is
        presented. To model the local phenomena associated with
        hydrogen, the local flow stress is considered decreasing with
        the increasing of hydrogen concentration. Following the
        previous work, a new module in the open source code
        ADVENTURE-Solid has been developed by the authors through
        considering the effect of hydrogen on material softening in
        microscale, which equips the open source code ADVENTURE-Solid
        software for studying hydrogen-plasticity interactions. We
        then combine the ADVENTURE-Solid with an in-house advection
        diffusion finite element program, to analyze a transient
        hydrogen diffusion-elastoplastic coupling problem ahead of a
        crack tip. To validate the new module in the ADVENTURE-Solid,
        a set of numerical test cases is presented and
        discussed. Results obtained show good agreement with previous
        results.