実験とシミュレーションの組合せ手法による高強度鋼の長寿命域疲労破壊特性の解明

概要

論文の詳細を見る
In order to clarify experimentally the damage process for the high strength steel in high and extremely high cycle regions and to propose a simulation model based on a new approach, rotating bending fatigue tests were performed with special focus on the effect of the role of the inclusion on the fatigue properties of high strength steel. The transition of fatigue crack initiation site from surface inclusion to internal one was observed with decreasing stress amplitude. The simulation model was proposed on the basis of the concept of a risk competition of defects, in which a virtual specimen has been constructed in the computer program and all inclusions were assumed to be equivalent to a crack origin. The results of the simulation were almost in accordance with the experimental results, and it was shown that this model could make the prediction of fatigue life of high strength steel in high and extremely high cycle regions.
一般社団法人日本機械学会の論文
2003-03-25