鋼の低サイクル疲労における微小き裂の成長特性とそれに及ぼす繰返し変形予履歴の影響

概要

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Normalized JIS S 35 C medium carbon and quenched & tempered JIS SNCM 439 alloy steels were low cycle fatigued under the push-pull and the axial strain controlled conditions. The fatigue crack of a=8〜12μm in depth originates at the cycle ratio of N/N_f=0.10. The cyclic J-integral range, ΔJ and the strain intensity factor range, ΔK_ε become good parameters for evaluating the growth rate of the small surface crack under low cycle fatigue. The prior cyclic deformation slightly accelerates the crack growth rate in SNCM 439 steel. The cyclic deformation history dependence of crack growth rate seems to be associated with the existence of a non-metallic inclusion in the material. The fatigue life curves evaluated on the basis of small crack growth are in quite good agreement with the test results.
一般社団法人日本機械学会の論文
1986-08-25