ステンレス鋳鋼の回転曲げおよびねじり疲労挙動の比較

概要

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Rotating bending and torsional fatigue tests were carried out on specimens of cast stainless steel. The initiation and propagation processes of microcracks were investigated using the plastic replica method. The main results are summarized as follows. (1) The critical cracks appeared at a microshrinkage cavity in rotating bending fatigue, but not in torsional fatigue. Therefore, the ratio of fatigue limits in cast stainless steel (τ_w/σ_w≒0.77) is larger than that of defect-free isotropic carbon steel (τ_w/σ_w≒0.65). (2) The crack growth laws in rotating bending and torsional fatigue are expressed by dl/dN∝σ^<7.8>l and dl/dN∝τ^<9.0>l, respectively. (3) The difference between the dependences of N_f on the stress amplitude in rotating bending fatigue and in torsional fatigue can be explained by the above crack growth laws.
一般社団法人日本機械学会の論文
1996-03-25