Abstract
It has already been indicated, as a general trend in impact fatigue, that the impact fatigue strength is lower than the ordinary fatigue strength, and that the crack growth rate under impact fatigue is higher than that under non-impact fatigue, excepting a few materials with relatively high static strength. The first aim of this study is to clarify the impact fatigue behaviors of high-strength alloy steels with the ultimate tensile strength of about 1800 MPa, and the second is to evaluate the crack growth behavior under impact fatigue load in connection with the dynamic stress-strain response. For these purposes, a series of impact fatigue tests were first carried out on martensitic stainless steel, and then single impact tests were performed to obtain dynamic stress-strain relation-ships of the martensitic stainless steel and the other three steels whose crack growth behavior in impact fatigue were already obtained by the authors. The S-N property of the martensitic stainless steels is similar to the other steels but the fatigue crack growth rate under impact fatigue load is equivalent to that under ordinary fatigue load. An interesting finding is that the crack growth behavior of each material under impact fatigue load is well correlated with the dynamic stress-strain response of that material.
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