疲労き裂伝播に着目した設計基準に関する二, 三の考察

概要

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In the present paper, the authors investigate many examples of two material constants, C and m, which are involved in the Paris Formula, da/dN=C(ΔK)^m. Some correlation exists between C and m, irrespective of variety in mechanical properties, metallographic structures, mean stress and compliance of loading system. Crystallographic features or other structure-insensitive characteristics may affect the correlation, but a definitely close one is considered available for the present proposal of design basis, as far as the conventional steels such as the hull-structural are concerned. Based on the C-m correlation, the authors demonstrate some formulation for evaluating the safety of hull structures. Loading spectrum, initial and final sizes of defect and threshold stress intensity factor are also taken into account.
社団法人日本船舶海洋工学会の論文