表面欠陥からの疲労亀裂伝播特性について : (第1報)

概要

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The characteristics of fatigue crack propagation from a surface flaw under cyclic bending stress are studied experimentally and the propagation rate is related to the stress intensity factor range. Measurement of crack configuration is made using electric-resistance probe method. The stress intensity factor for semi-elliptical surface crack is calculated using stress intensity magnification factor proposed by Kobayashi et al. It is concluded that the initial flaw size has little effect on fatigue crack propagation rate, but the range of applied load has considerable effect. This suggests that the maximum value of stress intensity factor should be taken into account as well as the stress intensity factor range. Fatigue crack propagation rate in bending test is compared with that in tensile test. It is shown that the former is a little lower than the latter.
社団法人日本船舶海洋工学会の論文