Analysis of vibration fatigue crack growth with crack surface friction damping
Liu wen-guang1,2 ； Chen guo-ping1
(1. MOE Key Lab of Structure Mechanics and Control for Aircraft, Nanjing University of Aeronautics &Astronautics, Nanjing, 210016)(2. School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang, 330063
Abstract：Cracked cantilever beam is employed as the object of study, and influence of crack surface friction effect on fatigue crack growth is studied. In the course of analysis, breathing behavior of crack is depicted by bilinear spring, breathing cracked beam is simplified into single-degree-of-freedom system via Galerkin method, and damping loss factor is derived based on Coulomb friction model and theory of energy dissipation., fatigue crack propagation is simulated by Forman equation, and coupling effect of vibration fatigue is considered by vibration analysis and crack propagation calculation alternately. Influence of friction damping on fatigue crack propagation life of cracked beam is discussed. Results indicate that friction damping is monotone increasing along with crack growth and the influence of friction effect on vibration fatigue crack propagation cannot be ignored.
2012, Vol. 31 
