涡喷发动机叶片振动的线弹断裂力学分析

LINEAR ELASTIC FRACTURE MECHANICS ANALYSIS FOR BLADE VIBRATION IN TURBOJET

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

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

摘要:

分析了涡轮喷气发动机的振动与线弹性断裂力学（ＬＥＦＭ）的关系。以叶片为例，将Ｇｒｉｆｆｉｔｈ准则和叶片的振动应力，特别是共振应力联系起来分析。接着用振动与晶体变形的关系来分析各种裂纹扩展的原因和条件以及叶片共振时各种裂纹叠加的可能性。

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.