关键词: 涡轮喷气发动机;涡轮叶片;压缩机叶片;燃烧振动;断裂力学

Abstract: n this paper, the relation between linear elastic fracture mechanics (LEFM)and vibration in turbojet is mainly analyzed.As and example, the stress in blades resulting from vibration, especially from resonance is also analyzed with Griffith criterion. The causes and the conditions of crackleextension are discussed based on the relation of vibration and crystal deformation. Finally,the possibiLity of crackle superimposure, when blades are in resonance, is discussed.

Key words: Turbojet engine;Turbine blade;Compressor blade;Combustion vibration, Fracture mechanics