モードI・モードII組合せ応力負荷の下での疲労き裂進展速度

概要

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"Fatigue crack propagation behaviour under the condition of mixed modes I and II applying was experimentally studied by applying tensile and torsional fatigue loadings of the same phase simultaneously on thin-walled hollow cylindrical specimens. As the initial component of ΔK_<II> increased, the fatigue crack growth rate accelerated in the low crack growth rate region. In the rigion, where da/dN=A(ΔK)^m holds, that is, in the second region of da/dN versus ΔK curve, the ratio of the initial ΔK_<II> to the initial ΔK_I, ΔK_<II>/ΔK_I, increased and reached near the value of 0.58, the fatigue crack growth rate became much lower than that at any other condition. When the value of initial ratio ΔK_<II>/ΔK_I increased further more, for example, ΔK_<II>/ΔK_I reached 2.16, the fatigue crack growth rate accelerated again. Under shear fatigue loading, the crack growth rate was higher than that of tensile fatigue loading
社団法人日本材料学会の論文
1984-05-15