Abstract
We propose a theoretical-experimental model of fatigue crack growth in hydrogen-containing media. The model is based on the regularities of exhaustion of energy accumulated in a material under the conditions of cyclic fracture and the influence of hydrogen-containing media on the mechanical characteristics of the material. By using the deformation approach of fracture mechanics, we deduce analytic dependences for the determination of the conditions of elastoplastic deformation of the material near the crack tip. The effects of crack closure and loading ratio are taken into account. The interactions of various phenomena caused by hydrogen and their general influence on the changes in the fatigue-crack growth rate are evaluated. We also compare the computed values of the fatigue-crack growth rate with experimental values for two types of steel under different conditions.
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