| 摘要 |
PROBLEM TO BE SOLVED: To accurately predict the life of engine parts until resulting in breakage by three breaking factors of low cycle fatigue, creep and high cycle fatigue without constructing a large-scale database requiring immense man-hours. SOLUTION: The life of engine parts when each breaking factor is independently applied is obtained by an experiment and set to databases DB11-13. When predicting a composite fatigue life by three breaking factors, time series simulation data of thermal load and vibration applied to the engine parts when operating an engine is obtained by an FEM analysis, and based on this data and the life data of the databases DB11-13, the amount of damage by each breaking factor of low cycle fatigue, creep and high cycle fatigue is obtained. The amount of creep fatigue damage is computed considering the influence of stress relaxation by interaction. The amount of high cycle fatigue damage is computed considering the influence of damage caused by vibration of a fatigue limit or less. Breaking is determined when the total of the damage amounts by three breaking factors becomes a prescribed value. COPYRIGHT: (C)2005,JPO&NCIPI
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