摘要
为研究某离心轮内部疲劳裂纹扩展及其无损定量表征,开展了高速低循环旋转疲劳试验以及多种无损检测定量表征、断口分析、疲劳裂纹扩展仿真对比研究。研究结果表明:疲劳裂纹到达表面后,疲劳裂纹处于非稳定扩展阶段;20000~21700循环间,区间疲劳裂纹扩展速率仿真值与无损表征值接近;21700~21789循环间,区间疲劳裂纹扩展速率无损表征值比仿真值大2.5倍左右。疲劳裂纹在离心轮内部、夹杂缺陷区外扩展时,疲劳裂纹处于稳定扩展阶段;全聚焦法(TFM)超声检测和衍射时差(TOFD)超声检测能识别离心轮夹杂缺陷/疲劳裂纹内部扩展;0循环和6000循环时疲劳裂纹在夹杂缺陷区内,无损检测表征值均未发生变化;9000循环及之后,裂纹高度H和径向长度LR的TFM超声无损表征值出现明显的增大,变化与断口值相似但增幅偏小。
In order to study the internal fatigue crack growth and the nondestructive quantitative characterization of the centrifugal wheels,the high-speed and low cycle rotating fatigue tests were carried out,and a variety of nondestructive quantitative characterization,fracture analysis and fatigue crack growth simulation were compared.The results show that after the fatigue cracks reach to the surfaces,the fatigue cracks are in the unstable growth stage.During 20000~21700 cycles,the simulation values of the interval fatigue crack growth rate are close to the non-destructive characterization values.During 21700~21789 cycles,the non-destructive characterization values of the interval fatigue crack growth rate are about 2.5 times larger than that of the simulation values.When the fatigue cracks propagate inside the centrifugal wheel and outside the inclusion areas,the fatigue cracks are in a stable growth stage.Total focusing method(TFM)ultrasonic testing and time of flight diffraction(TOFD)ultrasonic testing may identify the inclusion/fatigue crack internal growth of the centrifugal wheels.At 0 and 6000 cycles,the fatigue cracks are in the inclusion area,the nondestructive characterization values remain unchanged.After 9000 cycles,the TFM ultrasonic nondestructive characterization values of crack's height H and radial length LR increase significantly,the change is similar to the fracture values,but the increased amplitude is smaller.
作者
吴英龙
宣海军
单晓明
付汝龙
WU Yinglong;XUAN Haijun;SHAN Xiaoming;FU Rulong(School of Aeronautics and Astronautics, Zhejiang University, Hangzhou, 310027;AECC Hunan Powerplant Research Institute, Zhuzhou, Hunan, 412002;Guangdong Goworld Co.,Ltd., Shantou, Guangdong, 515065)
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2021年第6期658-665,共8页
China Mechanical Engineering
基金
国家科技重大专项(2017-IV-0012-0049)
工信部民机科研项目(MJ-2014-D-19)。
关键词
无损检测
钛合金盘
疲劳裂纹扩展
夹杂缺陷
nondestructive testing
titanium alloy wheel
fatigue crack growth
inclusion
