Fatigue crack growth modelling for pipeline carbon steels under gaseous hydrogen conditions

Abstract

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International licence Newcastle University ePrints -eprint.ncl.ac.uk Cheng A, Chen NZ. Fatigue crack growth modelling for pipeline carbon steels under gaseous hydrogen conditions.

Corrosion fatigue crack growth modelling for subsea pipeline steels

“…The authors proposed a two-stage Forman equation model for the HE influenced fatigue crack growth in hydrogen gas (Cheng and Chen, 2017). It is based on the corrosion-crack correlation and HEDE theory, which is consistent with Eq.…”

“…the inherent fracture toughness. In consistence with previous work (Cheng and Chen, 2017), is considered to be 1.0.…”

“…(16) is substituted by IH and IE respectively for the first and second stage Forman equations. Good agreement can be seen from the application of the two-stage Forman equation model to a wide range of carbon pipeline steels (Cheng and Chen, 2017…”

“…Based on the recent research on the mechanisms and modelling of EACs (Rhodin, 1959;McEvily and Wei, 1972;Gerberich et al, 1988;Parkins, 1992;Rhodes, 2001;Gangloff, 2003;Wang et al, 2013), a two-component CF crack growth model for subsea pipeline steels is proposed in this paper, in which the anodic dissolution (AD) model and the hydrogen embrittlement (HE) model newly established by authors (Cheng and Chen, 2017) are integrated within a framework of fracture mechanics. The model is then applied to modelling the CF crack growth of X65 pipeline steel and the impact of loading frequency, stress ratio, temperature, and hydrogen concentration on the model performance is discussed.…”

Report of Committee III.2: Fatigue and fracture

“…Adopting a hydrogen-enhanced de-cohesion theory, the crack tip plastic zone size has been used to include frequency effects as well. Experiments demonstrated the model effectiveness (Cheng & Chen, 2017b).…”