疲労亀裂の伝播について(その1) : 広幅板における亀裂伝播

概要

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Fatigue crack propagation rates were measured in wide thin mild steel plate specimens (width : 500mm, length : 840mm, thickness : 6mm). Experimental parameters were stress range and mean stress value applied to specimens. Results were compared with those obtained by experiments of standard specimens (width : 100 mm, length : 500 mm, thickness : 6 mm). On the basis of fatigue crack propagation law, da/dN=C(ΔK)^m where da/dN: crack propagation rate ΔK: stress intensity factor range C, m: material constants following results were oftained. (1) For the same size specimen, value of C increases as the mean stress value increeses, but value of m remains constant. (2) Value of m decreases when the size of specimen becomes larger. It was seemed to be due to the increase of constraint around tips of cracks.
独立行政法人海上技術安全研究所の論文
1976-02-28