안테나 일체형 구조를 위한 플라이 오버랩 조인트의 파손 예측 기반 구조 설계

초록

Conformal load-bearing antenna structure (CLAS) is a multifunctional airframe structure. CLAS can transmit and receive antenna signals due to the presence of an antenna inside, and can support major structural loads. Outer face sheet of one of the CLAS components is composed of a structural skin and electromagnetic (EM) wave windows. It is situated on the exterior of the airframe. The EM wave window is a structure that allows the antenna signal to pass through a conductive structure. It is manufactured by joining a dielectric laminate and a conductive laminate. In this article, we studied three types of ply overlap joint designs for the EM wave windows: staggered overlap, flush overlap, and hybrid overlap. The results of the tensile tests indicate that staggered overlap, hybrid overlap and flush overlap have the greatest joint strength in that order. Finite element analysis, applying a cohesive zone model that mimics interlaminar behavior, was able to explain the experimental results effectively. The finite element analysis demonstrated that the load-bearing plies present in the GF ply drop play an important role in the joint strength. Based on the results of the experiments and the finite element analysis, staggered overlap appears to be the most promising ply overlap joint method.