鋼板の貫通疲労き裂進展挙動の破壊力学的検討

概要

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The through fatigue-crack propagation rate for a centrally slitted low carbon steel plate has been determined. The rate, d(2a)/dN, is correlated with the stress intensity factor range, ΔK, as follows: (d(2a))/(dN)=C(ΔK)^m Strictly speaking, it appears that the larger the plate width (from 50 mm to 200 mm), the smaller the value of m, and that the higher the stress ratio (from 0.06 to 0.36), the larger the value of C. But, the plate thickness, slit size, stress wave, tensile/shear fracture mode transition behaviour and reduction of plate thickness resulting from general yielding do not affect the correlation. The fatigue life, N_f, is correlated with the initial apparent stress intensity factor range, ΔK_0, as follows: N_f=4.46×10^<-12>(ΔK_0)^<3.5> The predicted life from the rate is consistent with the correlation.
社団法人日本材料学会の論文
1974-09-15