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Governing equations for elastic-plastic material describing the damage accumulation  and  fracture  under  hydrogen  embrittlement  (HE)  conditions  are presented.  Scalar  damage  parameter  and  damage  evolution  equation  is  proposed. The proposed governing equations describe such features of HE as threshold stress, below  which  no  failure  occurs;  the  change  of  failure  surface  mode  during  HE;  the delayed behavior of fracture, the existence of threshold stress intensity factor, etc. The determination of material constants from available experimental data is proposed.