This paper provides background information on fatigue and describes the methodology used in Creo Simulation （Pro/Mechanica） fatigue analysis. It covers history and physics of fatigue, the E-N approach-Strain Cycles ...This paper provides background information on fatigue and describes the methodology used in Creo Simulation （Pro/Mechanica） fatigue analysis. It covers history and physics of fatigue, the E-N approach-Strain Cycles Includes the effect of mean residual stresses, hysteresis loop capture and rainflow cycle counting. Factors that affect fatigue life include component size, loading type, surface finish, surface treatment and effect of surface treatments on endurance limit. This paper describes practical problem solution and fatigue strength analysis of the wing-hinge to fuselage connection in Creo Simulation （Pro/Mechanica） environment. It also includes a procedure for calculating the buckling load factor and failure index.展开更多
Individual aircraft life monitoring is required to ensure safety and economy of aircraft structure, and fatigue damage evaluation based on collected operational data of aircraft is an integral part of it. To improve t...Individual aircraft life monitoring is required to ensure safety and economy of aircraft structure, and fatigue damage evaluation based on collected operational data of aircraft is an integral part of it. To improve the accuracy and facilitate the application, this paper proposes an engineering approach to evaluate fatigue damage and predict fatigue life for critical structures in fatigue monitoring. In this approach, traditional nominal stress method is applied to back calculate the S-N curve parameters of the realistic structure details based on full-scale fatigue test data. Then the S-N curve and Miner＇s rule are adopted in damage estimation and fatigue life analysis for critical locations under individual load spectra. The relationship between relative small crack length and fatigue life can also be predicted with this approach. Specimens of 7 B04-T74 aluminum alloy and TA15 M titanium alloy are fatigue tested under two types of load spectra, and there is a good agreement between the experimental results and analysis results. Furthermore, the issue concerning scatter factor in individual aircraft damage estimation is also discussed.展开更多
文摘This paper provides background information on fatigue and describes the methodology used in Creo Simulation （Pro/Mechanica） fatigue analysis. It covers history and physics of fatigue, the E-N approach-Strain Cycles Includes the effect of mean residual stresses, hysteresis loop capture and rainflow cycle counting. Factors that affect fatigue life include component size, loading type, surface finish, surface treatment and effect of surface treatments on endurance limit. This paper describes practical problem solution and fatigue strength analysis of the wing-hinge to fuselage connection in Creo Simulation （Pro/Mechanica） environment. It also includes a procedure for calculating the buckling load factor and failure index.
基金support from National Natural Science Foundation of China (No. 11772027)National Key Research and Development Program of China (No. 2017YFB1104003)Aeronautical Science Foundation of China (No. 28163701002)
文摘Individual aircraft life monitoring is required to ensure safety and economy of aircraft structure, and fatigue damage evaluation based on collected operational data of aircraft is an integral part of it. To improve the accuracy and facilitate the application, this paper proposes an engineering approach to evaluate fatigue damage and predict fatigue life for critical structures in fatigue monitoring. In this approach, traditional nominal stress method is applied to back calculate the S-N curve parameters of the realistic structure details based on full-scale fatigue test data. Then the S-N curve and Miner＇s rule are adopted in damage estimation and fatigue life analysis for critical locations under individual load spectra. The relationship between relative small crack length and fatigue life can also be predicted with this approach. Specimens of 7 B04-T74 aluminum alloy and TA15 M titanium alloy are fatigue tested under two types of load spectra, and there is a good agreement between the experimental results and analysis results. Furthermore, the issue concerning scatter factor in individual aircraft damage estimation is also discussed.
