Initial Fatigue Crack Growth Behavior in a Notched Component (Report III) : Effect of Cyclic Yield Strength(Mechanics, Strength & Structural Design)

概要

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The present report was intended to evaluate the difference of initial fatigue crack propagation rate between mild steel and high tensile strength steel in notch field subjected to high stress. The two used materials (SS41, HT80) had similar chatacteristics in long crack propagation (R=-1) when small scale yield condition was satisfied. However in low cycle (high stress) region (R=-1), initial fatigue crack propagation rate in center notched strip of SS41 was higher than that of HT80. This characteristics might result from elasto-plastic effect on fatigue crack propagation. By application of ΔJ calculated in this study, the elasto-plastic effect could be evaluated. As the results, it would be mentioned that initial fatigue crack propagation rate in notch field taking elasto-plastic behavior can be estimated from master curve of long crack by using ΔJ in which cyclic yield strength of material is considered.
大阪大学の論文