表面疲労き裂の伝ぱ速度のばらつき特性に及ぼす材料組織の影響

概要

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In order to clarify the cause for statistical scatter of fatigue lives, crack propagation behavior was investigated. Three kinds of metals, a low carbon steel (S15C) with four grain sizes, a pure copper and an austenitic stainless steel (SUS304), were tested under rotating bending to examine the effect of material structure. To evaluate the characteristics of scatter of crack propagation rate, the relationship between the crack propagation rate da/dN and the stress intensity factor range ΔK was analyzed for four ranges of crack length from crack initiation to failure. Statistical properties of a power m and a coefficient C in the Paris' law obtained by a regression analysis for each crack were examined in relation to material structure. Furthermore, the crack deflection ratio, R_d, obtained from the measurement of crack length along crack path, which increases with the effect of material structure, was statistically examined and discussed.
社団法人日本材料学会の論文
1989-10-15