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Hydrogen embrittlement is one of the issue should be clarified for the safe usage
of hydrogen storage components. According to the experimental fact that
hydrogen significantly decreases the ductility of steel[1], it is believed that
hydrogen embrittlement fracture is responsible for the feature of dislocation
motion. Interaction between dislocations in the presence of hydrogen has been
extensively investigated by many researchers[2,3]. Note that, the effect of
hydrogen on dislocation emission is also important for the understanding of
mechanical properties of metal. It is experimentally recognized that hydrogen
enhances the dislocation emission[4-7], however the exact reason for this
phenomenon has not been well clarified. Decrement of the cohesive energy[5,6]
or decrement of the elastic modulus[6,7] are reported to attribute the enhancement
of the dislocation emission.