SCM 435 丸捧の応力変動時の疲労き裂進展挙動

概要

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The constnat and variable stress amplitude fatigue tests were carried out on smooth and pinholed specinemens of SCM 435 steel under rotating bending conditions. In the constant stress amplitude tests, the fatigue crack propagation rate was not affected by the stress level and it was represented well by ΔK. The crack initiated by the over-stress σ_<a1> cycle was retarded by the under-stress σ_<a2> cycles, when the difference between σ_<a1> and σ_<a2> was large. In the case of non-propagating cracks, their length was shorter than that in plain carbon steels. The condition of crack retardation under σ_<a1> repetition following σ_<a2> application was elucidated. The crack propagation behavior of pin-holed speciments in two step multi-fold tests was similar to that in two step two-or three-fold tests. The discussion was made on the shift from unity in cumulative cycle ratio for smooth apecimens, based on the results of crack propagation behavior of pin-holded specimens.
社団法人日本材料学会の論文
1985-10-15