TC17钛合金超高周弯曲振动疲劳试验

李全通; 刘青川; 申景生; 程礼; 高潮; 陈卫

TC17钛合金超高周弯曲振动疲劳试验

空军工程大学工程学院, 西安 710038

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出版历程
- 收稿日期: 2011-04-22
- 修回日期: 2011-09-02
- 刊出日期: 2012-03-28

Experiment on ultra-high cycle bending vibration fatigue of titanium alloy TC17

School of Engineering, Air Force Engineering University, Xi’an 710038, China

摘要

摘要: 基于航空发动机叶片基本失效形式,开发了悬臂梁式弯曲振动超声疲劳试验系统(激振频率20kHz),设计了能模拟叶片振动、适合于超高周弯曲振动疲劳试验的试件.利用该系统开展了钛合金TC17超高周弯曲振动疲劳试验研究,分析了断口的金相图.结果发现:裂纹萌生有表面和次表面两种模式,并不依赖于内部夹杂和缺陷,没有发现内部裂纹萌生迹象,次表面裂纹扩展也不呈“鱼眼”形貌.与文献所述的“鱼眼”形貌特征不同.
- TC17钛合金 /
- 超高周疲劳 /
- 弯曲振动 /
- 裂纹源 /
- 裂纹扩展
Abstract: The development of an ultra-high cycle bending vibration fatigue system on the basis of the mechanism of the fatigue failure of aeroengine vanes was discussed,including the design of ultra-high cycle dissymmetrical bending fatigue specimens.Research about TC17 was accomplished by the Ultra-High Cycle bending fatigue system (20 kHz).The fractograph of specimens was analyzed.The result indicates that the crack initiation is independent of interior inclusion and defect,and there are two kinds of mechanism of fatigue crack initiation:arising on surface or subsurface void.In addition, behaviors of interior crack initiation and propagation were not found the image of crack propagation is different from “fish-eye”.
- titanium alloys TC17 /
- ultra-high cycle fatigue /
- bending vibration /
- crack initiation /
- crack grow

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参考文献(16)

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