Abstract

In this article, the effects of damage (delamination) on the structural vibration characteristics of spar wingskin joints (SWJs) made with curved laminated composites are investigated. Three dimensional finite element analysis is employed to evaluate the natural frequencies and corresponding mode shapes of the joint structure considered. Virtual elements are implemented in the delamination region to prevent inter element penetration. The effectiveness of the finite element analysis technique used is validated with available results. Additionally, the effects of various parameters such as delamination size, curvature effect (shallowness angle), laminate stacking sequence, overlap length, and material anisotropy (modular ratio) on the free vibration responses of the curved SWJ are analyzed in details. The present delamination modeling and simulated results could serve as guidelines in designing curved laminated composite joint structures with/without delaminations.

摘要

在本文中，研究了损伤（分层）对弯曲叠层复合材料制成的翼梁翼缘接头（SWJ）的结构振动特性的影响。使用三维有限元分析来评估所考虑的接头结构的固有频率和相应的振型。虚拟元素在分层区域中实现，以防止元素间渗透。可用的有限元分析技术的有效性已得到验证。此外，详细分析了各种参数（例如分层大小，曲率效应（浅角），层压板堆叠顺序，重叠长度和材料各向异性（模数比））对弯曲SWJ的自由振动响应的影响。