高強度鋼の長寿命域における破壊機構の遷移を考慮した二段多重変動応力試験

概要

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Fatigue behavior under variable amplitude loading was studied on a high carbon chromium steel, JIS SUJ2. Special attentions were paid on the evaluation of fatigue damage by the Palmgren-Miner rule and the damage mechanisms under variable amplitude loading accompanied by the failure mode transition in high cycle regime. Tests were performed using cantilever-type rotating bending fatigue testing machines in laboratory air. Load sequences employed were two-step multiple block loadings (low↔high). When two stress levels, under each of which the failure mode was the same, were applied, the failure mode was subsurface-type. Fatigue damages were evaluated successfully by the Palmgren-Miner rule. On the contrary, when the failure modes under both stress levels were different, the failure mode was surface-type. In this case, the cumulative damage at each stress level was independent of each other. Based on SEM observation, the morphologies of fish-eye formed under two-step multiple block loadings were the same as those under constant amplitude loadings.
社団法人日本材料学会の論文
2006-09-15