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不同氢蚀程度的２０Ｇ钢疲劳行为研究表明：当应力比Ｒ较小时，随材料损伤的加剧，ΔＫｔｈ存在一个最小值；而当应力比继续增大时，ΔＫｔｈ出现单调下降趋势。氢蚀后２０Ｇ钢的裂纹扩展门坎值受材料氢损伤引起的扩展抗力下降和粗糙表面诱发闭合效应导致的抗力提高两因素共同控制。
The fatigue behavior of 20G steel with different degree of hydrogenation shows that when the stress ratio R is small, ΔKth has a minimum value as the material damage aggravates. When the stress ratio continues to increase, ΔKth decreases monotonically. The crack propagation threshold value of 20G steel after hydrogen ablation is controlled by two factors, namely, the decrease of extended resistance caused by the hydrogen damage of the material and the improvement of the resistance caused by the rough surface induced closure effect.