某发动机压气机Ⅳ级盘断裂失效分析  

Fracture Analysis on 4th Compressor Disc of an Engine

作　　者：刘新灵[1] 姜涛[1] 

机构地区：[1]北京航空材料研究院中国航空工业失效分析中心,北京100095

出　　处：《失效分析与预防》2007年第1期14-18,共5页Failure Analysis and Prevention

摘　　要：某发动机压气机Ⅳ级盘破裂导致飞机起火爆炸,为分析压气机Ⅳ级盘的断裂性质和原因,本文对Ⅳ级盘的部分残骸进行了外观检查,对Ⅳ级盘轮缘和辐板断口进行了宏、微观检查和分析,对辐板表面的点蚀坑和辐板源区的点蚀坑进行了能谱分析,并对断口上的疲劳弧线进行了测定。本文还对辐板所用材料的材质进行了分析,并对发动机的振动特性进行了试验和计算。发动机压气机Ⅳ级盘的断裂性质为高周疲劳;该Ⅳ级盘的组织、硬度、化学成分和断裂区部位辐板厚度均符合技术要求,盘的疲劳断裂与材质无关;辐板与轮缘的R3转接处表面存在点蚀坑诱发了故障的发生,Ⅳ级盘的疲劳开裂和扩展主要与盘的共振有关。Some plane was caused fire and exploded because of the fracture of the 4th disc of the engine. In this paper, in order to give the fracture mechanism and causes of the 4th disc some observation and analysis were made, such as the visual inspection of some debris of the 4th disc, the macroscopic and microscopic observation of the fracture surface on the flange and web of the 4th disc. The corrosion pits on the web surface and at the edge of the fracture surface were analyzed by Energy Spectrum. The beach marks on the fracture surface were measured. The material quality of the web was also analyzed. The vibration peculiarity of the engine was tested and calculated. The fracture mechanism of the 4th compressor disc is high cycle fatigue. The microstructure, hardness, chemical composition and the web thickness of the fracture site all meet with technical requirements. The fatigue failure has no connection with the material quality. The corrosion pits at the P,3 arc transition between the web and the flange induced accident. The cracking and propagation of the 4th compression disc is mainly related to the vibration stresses.

关 键 词：压气机盘 失效分析 断口定量分析 振动应力 

分 类 号：V231.95[航空宇航科学与技术—航空宇航推进理论与工程]