摘要
某型号飞机尾减机匣试验过程中出现异常,荧光检查发现裂纹。通过故障机匣外观检查、裂纹断口宏微观观察及能谱分析、材料硬度检测、金相检查等试验得出结论,尾减机匣失效属低周疲劳开裂,机匣表面Nd元素偏析是导致机匣疲劳裂纹形成的直接原因,材料韧性不足一定程度上促进了裂纹的疲劳扩展,根据分析结果,给出提高尾减机匣受力部位的疲劳抗力,避免故障再次发生的有效方法。
A crack was founded in an engine box of an aeroplane during fatigue test by fluorescence penetrate testing. According to the results of macroscopical testing, fractography analysis, chemical analysis,hardness testing and metallographic analysis, it is concluded that the fracture model is low cycle fatigue,Nd segregation of the surface results in the fatigue fracture of the engine box and low material toughness promots the extending of the crack. Based on the analysis results, some measures are brought forward to avoiding the failure of the engine box.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2009年第10期49-52,共4页
Journal of Materials Engineering
关键词
尾减机匣
失效分析
疲劳裂纹
Nd偏析
engine box
failure analysis
fatigue crack
Nd segregation
