Random Vibration Fatigue Life Analysis of Aeroengine Bolts Using the Frequency-Domain Method

• Autorzy: Tian Lilin , Wang Jun , Zhang Chaofeng , Guo Yuchao , Chang Liang

Identyfikatory

DOI

10.2478/fas-2024-0010

• Języki publikacji: EN

Abstrakty

EN

Bolt connections are widely used in aircraft engines due to their advantages of high stiffness, low weight, and ease of assembly and disassembly. However, they are subjected to complex stress states in service, including high preloads, combustion-induced forces, and random vibrations, which may lead to fatigue failure. Since the fatigue performance of bolts directly affects the reliability of engines and their fuel accessories, accurate fatigue life estimation is essential for safe design. This study proposes a frequency-domain method for evaluating the random vibration fatigue life of bolts in aeroengine fuel accessories. A detailed finite element model of the bolted connection was established, with excitation boundary conditions defined by the assembly configuration. Modal, frequency response, and random response analyses were performed to obtain the stress power spectral density (PSD) of the bolts. The Dirlik method, combined with the material’s S-N curve, was then applied to estimate fatigue life under broadband and narrowband vibration excitation. Results show that bolts in the Y-direction experience the highest RMS stresses, leading to the shortest fatigue life - approximately 4.44 hours under critical loading conditions - which does not meet design requirements. The proposed method enables rapid evaluation of bolt fatigue life under random vibration environments, providing a practical tool to support bolt selection and design optimization in aeroengine applications.

Słowa kluczowe

EN

bolt fatigue; Dirlik method; random vibration; fatigue life prediction

• Wydawca: Wydawnictwa Naukowe Sieci Badawczej Łukasiewicz - Instytutu Lotnictwa
• Czasopismo: Fatigue of Aircraft Structures
• Rocznik: 2024
• Tom: Iss.16
• Strony: 147--160
• Opis fizyczny: Bibliogr. 9 poz., rys., wykr., wzory

Twórcy

autor

Tian Lilin

• National Key Laboratory of Strength and Structural Integrity, Aircraft Strength, Research Institute of China, 710065, Xi’an, China

• https://orcid.org/0009-0002-8362-323X

autor

Wang Jun

• National Key Laboratory of Strength and Structural Integrity, Aircraft Strength, Research Institute of China, 710065, Xi’an, China

autor

Zhang Chaofeng

• National Key Laboratory of Strength and Structural Integrity, Aircraft Strength, Research Institute of China, 710065, Xi’an, China

autor

Guo Yuchao

• National Key Laboratory of Strength and Structural Integrity, Aircraft Strength, Research Institute of China, 710065, Xi’an, China

autor

Chang Liang

• National Key Laboratory of Strength and Structural Integrity, Aircraft Strength, Research Institute of China, 710065, Xi’an, China

Bibliografia

• China Nonferrous Metals Industry Association. (2007). Titanium and titanium alloy plate and sheet (GB/T 3621-2007). Standards Press of China.
• Dirlik, T. (1985). Application of computers in fatigue analysis (Doctoral dissertation). University of Warwick.
• Liu, C. (2009). Research on preload and fatigue life of connecting bolts in aeroengine rotors (Doctoral dissertation). Nanjing University of Aeronautics and Astronautics. (Original work in Chinese).
• Ma, B. (2014). The analysis of connection for aeroengine with bolted joints (Doctoral dissertation). Dalian University of Technology. (Original work in Chinese).
• Mei, H. (2014). Research on equivalent method for estimation of random vibration fatigue life (Doctoral dissertation). Nanjing University of Aeronautics and Astronautics. (Original work in Chinese).
• Song, X. (2014). A study on random vibration analysis method and engineering applications (Doctoral dissertation). Harbin Engineering University. (Original work in Chinese).
• Wang, M. (2009). Research on life analysis method for structure vibration fatigue (Doctoral dissertation). Nanjing University of Aeronautics and Astronautics. (Original work in Chinese).
• Verein Deutscher Ingenieure. (2014). Systematische Berechnung hochbeanspruchter Schraubenverbindungen - Mehrschraubenverbindungen (VDI 2230). VDI Verlag.
• Zhou, H. (2016). Study on high temperature creep and fatigue life for typically threaded connections of aero-engine (Doctoral dissertation). Northwestern Polytechnical University. (Original work in Chinese).

Uwagi

This article was presented at the 32nd Symposium of ICAF https://www.icaf2025.com/