OPTIMIZATION OF THE NUMERICAL TREATMENT OF STRESS-STRAIN ASSISTED HYDROGEN DIFFUSION FOR STUDIES OF HYDROGEN EMBRITTLEMENT OF NOTCHED BARS

摘要

The stress-strain assisted hydrogen diffusion in metals under variable loading is concerned as a key element of elucidation of hydrogen embrittlement (HE). The suitability of simplified treatments of hydrogen diffusion in notched solids under monotonic loading is addressed comparing various 1D and 2D modeling approaches to assess if generated approximate solutions can provide acceptable results along the diffusion depth towards prospective rupture sites, so that quite more expensive simulations may be eluded. For different geometry-and-loading cases, respective time-depth domains are revealed where certain simplified procedures can be fairly suitable to carry out calculations of metal hydrogenation for the purposes of HE analysis, while the choice of the optimum route for the stress-strain assisted diffusion simulations in notched members is case- and purpose-dependent.