A Statistical Review of Hydrogen Effects on the Fatigue and Fracture Behavior of Steel

This project lays out a clear method for checking how hydrogen hurts the mechanical properties of structural steels. It re‑examines old experimental data with statistical tools. The approach looks at how hydrogen changes fatigue strength from medium to high cycles and how it shifts the threshold stress‑intensity‑factor range. Linear regression, S‑N curve fitting, and Paris‑law regression are used to compare hydrogen sensitivity of conventional steels versus stainless steels. The results show that the high‑cycle endurance limit stays about the same, but the fatigue life in the medium‑cycle range drops noticeably. In hydrogen‑charged conditions, the threshold stress‑intensity‑factor range drops consistently, especially for conventional steels. The Paris‑law constants vary a lot between

material groups, so no clear pattern emerges. This highlights how hard it is to model sub‑critical crack growth when hydrogen is present. The work provides a structured path for testing fatigue‑life prediction models and for setting probabilistic design limits for hydrogen transport and storage systems.

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