| 刘军和，巩孟祥，魏涛，曹家洺.航空发动机离子火焰探测器探管裂纹故障分析[J].航空发动机,2021,47(S1):64-68 |
| Analysis on Crack Failure of Ion Flame Detector of Aeroengine |
| DOI： |
| Key Words:crack of weld seam failure analysis ion flame detector probe tube aeroengine |
|
| 摘要点击次数: 1029 |
| 全文下载次数: 695 |
| Abstract:There were two consecutive cracks at the root weld of the probe tube of the ion flame detectorafter the test run of an aeroen?
gine. In order to find out the cause of the fault，the appearance inspection，fracture analysis，product structure and processing process
were analyzed and the crack of the probe tube was determined as fatigue crack.After analysis，the causes of fatigue cracks at the weld joint
of the two faulty products were determined as follows：uneven wire feeding speed during two times of manual argon arc welding and overlay?
ing welding，resulting in uneven weld toe. The weld toe was the fusion line at the end of probe pipe，which caused stress concentration and
protrusion on the surface of probe pipe. During the engine test，the probe tube of ion flame detector formed fatigue source from the weak
part of the probe tube under the action of alternating stress such as thermal shock and vibration，which eventually caused the crack to pene?
trate the wall thickness of the probe tube along the radial direction and continued to expand along the circumferential direction，resulting
in fatigue fracture. Some preventive and improvement measures are put forward，such as defining the shape of weld surface，ensuring the
position and speed of filler，increasing the fluorescence inspection after polishing，increasing the magnifying glass inspection of probe pipe
weld，field survey and so on. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
