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고정익 항공기 주익 구조물 하중 해석을 통한 균열 원인 분석 및 결함 개선
권나은(Na Eun Kwon),손혜경(Hye Gyeong Son),서의화(EuyHwa Seo),이진원(Jinwon Lee) 한국산학기술학회 2024 한국산학기술학회논문지 Vol.25 No.1
In this study, an improved design was proposed to address crack formation in a bracket used to secure the asymmetric brake of the flap in front of the main wing of a military aircraft and to prevent recurrence. A defect analysis tree was used to identify the cause, and items of interest were identified by fracture surface /structural analysis and subjected to further analysis. Fracture surface analysis confirmed that the cracks were caused by a lack of static strength and propagated due to fatigue induced by repeated tensile loading. We confirmed that loads beyond design specifications were responsible for the lack of static strength, and calculation showed static strength was insufficient under certain load conditions. The improved shape was reinforced to cope with the additional load, and it was confirmed that the modification improved structural health. In addition, a check of safety margins showed that static strength requirements were met.