복합소재 원통형 구조물의 붕괴좌굴 특성에 관한 연구

Abstract

With the recent trends of increasing submarine operating in deep-sea environment, several research has been actively carried out to secure their stability and structural intensity with lower weight. The submarine as a pressure hull structure should resist many restrictions on loadings due to increase of depth, such as external pressure. Increasing external pressure requires shell structure with a larger radius or length than their thickness. Therefore buckling phenomenon is a main concern of submarine design. In this study, buckling collapse characteristics of composite cylindrical structure were examined. First of all, numerical methods using ANSYS and ANSYS Composite Pre-post (ACP) were validated by comparing the experimental models: Aluminum cylinder, 8-layer plate and composite cylinder. Second, aluminum and composite cylinder models were compared to the same strength and weight. Also, comparison with design codes (NASA, ASME) for cylinder composed of composite material was included. Lastly, several case studies were performed to investigate the effect of stacking angle, stacking ratio. As a result of the study, the smaller the angle, and the larger the stacking ratio, the greater the collapse pressure value.