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首页> 外文期刊>Engineering failure analysis >Failure analysis of an aircraft auxiliary power unit air intake door
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Failure analysis of an aircraft auxiliary power unit air intake door

机译：飞机辅助动力装置进气门的故障分析

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摘要

A remarkable number of auxiliary power unit (APU) air intake doors of the C27-J aircrafts consisting in A356-T6 casting aluminium alloy were found prematurely cracked during post-flight inspections. All the cracks were localized in correspondence of the inner side ribs and affected by extroversion. Examination of the fracture surfaces by using electron microscopy revealed the cracks propagated in accordance with a high cycle fatigue mechanism induced by in-service typical loads, such as vibrations and air turbulent flows. The doors were found to be confirmed to the chemical, metallographic and hardness requirements for the selected material. The stress induced by these loads was also locally increased by sub surface shrinkage cavities located in correspondence of the ribs. As a consequence of that, new doors, in terms of design as well as material, have been introduced, thus obtaining the necessary functional improvements.
机译：在飞行后检查期间，发现由A356-T6铸造铝合金制成的C27-J飞机的大量辅助动力装置（APU）进气门过早破裂。所有的裂纹都与内侧肋骨相对应并受到外倾的影响。通过电子显微镜检查断裂表面，发现裂纹是根据在役典型载荷（如振动和空气湍流）引起的高循环疲劳机理传播的。发现门已确认符合所选材料的化学，金相和硬度要求。这些载荷引起的应力也因与肋条相对应的次表面收缩腔而局部增加。结果，就设计和材料而言，引入了新的门，从而获得了必要的功能改进。

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