from the conferences organized by TANGER Ltd.
Fatigue in Cr-Mo steel, JIS SCM435, candidate for use in fuel cell vehicles is investigated at different test frequencies in two groups of hydrogen charged and uncharged specimens under tension-compression fatigue and stress ratio R = −1. Specimens are machined in hour-glass shape with artificial hole from which initial cracks start their propagation. The obtained fatigue data of each frequency are presented in plots “Crack length - Number of cycles” and “Fatigue crack growth rate - Crack length”. A mathematical model consists of double-parabolic-linear-curve is found for the data in the presentation “Fatigue crack growth rate - Crack length” and a comparison made between those curves for the different frequencies. The adequacy of modelling is checked and proved by comparison between experimental fatigue lifetimes and the calculated by the model.
Keywords: Fatigue, hydrogen fuel cell systems, Cr-Mo steel, short fatigue crack, crack growth rate© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.