蠕动
高温合金
涡轮叶片
材料科学
断裂(地质)
刀(考古)
结构工程
涡轮机
机制(生物学)
压力(语言学)
失效机理
燃气轮机
机械工程
工程类
复合材料
微观结构
物理
语言学
哲学
量子力学
作者
Debin Sun,Guoli Ma,Z. Wan,Jinhai Gao
标识
DOI:10.1016/j.engfailanal.2023.107715
摘要
Aiming at the creep-fatigue interaction damage failure problem of turbine blades in aeronautical engineering, firstly, based on the modified Kachanov-Rabotnov-Chaboche (MKRC) damage mechanics theory, the creep-fatigue life prediction model of turbine blade material was constructed with the experimental verification completion of nickel-based superalloy DZ125. Meanwhile, the creep-fatigue interaction behavior was investigated with the mechanism revelation. Then, considering the shape, size and microscopic defect difference effect from the material to the structure, the creep-fatigue life prediction model of turbine blade structure is proposed by introducing the comprehensive correction factor with experimental verification. Finally, the research results show that there are a large number of interwoven tear edges, micro-cracks and micro-pores in the fracture morphology, and creep and fatigue interact with each other in the form of effective stress. Simultaneously, the creep-fatigue life prediction model has a high life prediction ability with an error of 3%, which can provide a theoretical reference for the damage tolerance design of the turbine blade.
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