Cohesive zone modeling of fatigue crack propagation assisted by gaseous hydrogen in metals

A review of cohesive zone modelling as an approach for numerically assessing hydrogen embrittlement of steel structures

“…Most known attempts of implementing hydrogen influence into the cohesive model is through the HEDE principle [11,15,16,[40][41][42]; hydrogen reduction of the cohesive energy at fracture. In its most simplistic approach, the critical hydrogen dependent cohesive stress σ C (C) is assumed to rsta.royalsocietypublishing.org Phil.…”

“…While most studies are able to reproduce single experimental results by appropriate fitting to the cohesive parameters, there still appears to be limitations on transferring these results to other hydrogen systems [15,16]. Moriconi et al [16] have developed a cohesive model based on coupled effects between mechanical cyclic loading and hydrogen diffusion. Simulated fatigue crack growth was compared with experimental measurements on martensitic stainless steel under gaseous hydrogen.…”

“…In recent years, cohesive zone modelling (CZM) has gained increasing interest as suitable method for modelling hydrogen embrittlement [10][11][12]14,16], with the possibility of providing increased understanding of the involved process and their interactions combined with reduced time and costs compared to experimental programs. The damage process is classically described by interface elements, which constitutive relation is defined by a cohesive law (traction separation law).…”

Application of Paris’ law for estimation of hydrogen-assisted fatigue crack growth

“…(8) and (9), and with a specific value of DK, the corresponding crack growth rate under hydrogen assisted fatigue da H dN will be: Attention is turned now to l in Eqs. (8) and (11). In Eq.…”

“…For example, pipes conveying hydrogen (as a fuel) are directly prone to the possible damaging effects of hydrogen. Despite this, steel remains the first choice for pipelines [8][9][10] in the expanding market for hydrogen fuel [9,11]. Development in recent years of design codes for hydrogen piping and pipeline, such as ASTM B31.12 [12] is the direct result of the increasing demand for conveyance of hydrogen using steel pipelines.…”