Evaluation of vibration stress of TA11 titanium alloy blade by quantitative fractography

• Published in: Rare metals Vol. 33; no. 3; pp. 263 - 269
• Main Authors: Liu, Xin-Ling, Xu, Yuan-Ming, Tao, Chun-Hu
• Format: Journal Article
• Language: English
• Published: Springer Berlin Heidelberg Nonferrous Metals Society of China 01.06.2014; Springer Nature B.V
• Subjects: Biomaterials; Blades; Chemistry and Materials Science; Compressor blades; Crack propagation; Energy; Equivalence; Fatigue failure; Fracture mechanics; Materials Engineering; Materials Science; Metallic Materials; Nanoscale Science and Technology; Physical Chemistry; Stresses; Vibration; 压气机叶片; 失效形式; 定量断口; 振动应力; 疲劳应力; 航空发动机试验; 评价方法; 钛合金叶片; Compressor blade; Stress evaluate; Quantitative fractography; Bending vibration
• ISSN: 1001-0521; 1867-7185
• DOI: 10.1007/s12598-014-0307-2

Vibration fatigue is the main failure mode of compressor blade. Evaluating the vibration stress of blade that leads to cracking is very useful for analysis of vibration fatigue. In this paper, fatigue stress estimation methods by quantitative fractography were studied through experimental blade and in-service first-stage compressor blade in order to evaluate the initiation vibration stress of in-service blade. The analysis process of initiation vibration stress was established. The evaluating result of vibration stress of in-service blade subjected to centrifugal force and bending vibration stress agrees with aero engine test result. It is shown that the evaluation method can not only evaluate the equivalent fatigue stresses of different crack depths but also yield the initiation equivalent fatigue stress.