Abstract

The cutouts are commonly found in fiber metal laminates to facilitate to pass electrical wires, water/fuel lines and sometime to facilitate easy access and inspection. Sometimes, such cutouts need to be reinforced by providing stiffener around the cutouts to avoid pre-mature failures. This article addresses the effects of reinforced cutouts and non-linearly varying edge loads on the vibration and buckling performance of inter laminar hybrid fiber metal laminates (HFMLs) by utilizing finite element approach. Toward this a 9-noded heterosis plate element has been used to discretize both plate and stiffener by taking into account the effect of shear deformation and rotary inertia. The stiffener considered in this study is spread in nature. The displacement compatibility by the plate and stiffener is maintained by using transformation matrix. The effect of eccentricity of the spread stiffener is also incorporated within the transformation matrix. Since the stress distribution within the plate is highly non-uniform in nature, the dynamic approach has been used to solve the buckling problems. The present study consists of aluminum metal face sheets bonded with four layered symmetric hybrid cross-ply laminates, in which six different hybrid configurations have been considered. The performance of each hybrid configuration along with different sized and positioned reinforced cutouts is well investigated under various nonlinear loading conditions.

摘要

切口常见于纤维金属层压板中，以方便穿过电线、水/燃料管线，有时还便于接近和检查。有时，此类切口需要通过在切口周围提供加强筋来加固，以避免过早失效。本文利用有限元方法研究了增强切口和非线性变化的边缘载荷对层间混合纤维金属层压板 (HFML) 的振动和屈曲性能的影响。为此，考虑到剪切变形和旋转惯性的影响，已使用 9 节点杂种优势板单元对板和加强筋进行离散化。本研究中考虑的加强筋在自然界中分布。板和加强筋的位移相容性通过使用变换矩阵来维持。扩散加强筋的偏心效应也包含在变换矩阵中。由于板内的应力分布在本质上是高度不均匀的，因此已使用动态方法来解决屈曲问题。本研究包括与四层对称混合正交层压板粘合的铝金属面板，其中考虑了六种不同的混合配置。在各种非线性载荷条件下，对每种混合配置以及不同尺寸和位置的加固切口的性能进行了深入研究。本研究包括与四层对称混合正交层压板粘合的铝金属面板，其中考虑了六种不同的混合配置。在各种非线性载荷条件下，对每种混合配置以及不同尺寸和位置的加固切口的性能进行了深入研究。本研究包括与四层对称混合正交层压板粘合的铝金属面板，其中考虑了六种不同的混合配置。在各种非线性载荷条件下，对每种混合配置以及不同尺寸和位置的加固切口的性能进行了深入研究。