곡률 브라켓 구조물의 구조강도 개선효과 검증에 관한 실험적 연구

Abstract

Weapon systems used in the defense field are classified according to each mission/function, from weapons that perform relatively simple functions to system units that are combined with components with core performance. However, even if defects occur during operation in some components due to the characteristics of such a system unit weapon system, there are limitations to structurally confirm the effect of the resulting improvement plan at the system unit. Therefore, a method of confirming the effect of improving the structure by using a limited structural test for the defective part and structural analysis using a FEM is generally used. In fact, during the operation of the rotorcraft, a crack occurred in the bracket-rivet joint inside the exhaust duct, and the structure was improved accordingly. However, the exhaust duct was manufactured in a cylindrical shape and had a curvature, and there were limitations in finding an accurate test method for the curvature bracket structure. In this study, a test was conducted to confirm the structural improvement effect of a bracket structure with curvature by referring to the test method for a commonly used flat metal structure, and by analyzing the test results, the lifespan improvement in the system unit was confirmed.