Sirajudeen Rahima Shabeen, P Alagusundaramoorthy
College of Engineering Guindy, Anna University, Chennai 600025, India.
Indian Institute of Technology Madras, Chennai 600036, India.
Polymers (Basel). 2021 Apr 7;13(8):1185. doi: 10.3390/polym13081185.
The high-strength-to-weight ratio and corrosion resistance properties of glass-fiber-reinforced polymer (GFRP) composites makes them potentially well-suited for application in ship structures, bridges and off-shore oil platforms. These structures are often formed by stiffened plates and are subjected to axial load and out-of-plane load. Cutouts and openings are provided in the plates for access and maintenance. The main objective of this study was to examine the buckling behavior of GFRP-stiffened composite plates with square cutouts under a combination of axial and out-of-plane load up to failure. Four blade-stiffened composite plates without a cutout and four with square cutout were fabricated with stiffeners as a continuous layup of the flange plate using glass fiber and epoxy resin. The initial geometric imperfections were measured, and plate imperfections (Δx), stiffener imperfections (Δsy) and overall imperfections (Δsx) were calculated from the measurements. All fabricated-stiffened composite plates were tested up to failure. The finite element model was developed in ANSYS software and validated with the experimental results. It was observed that GFRP-stiffened composite plates failed by stiffener compression/stiffener tension mode of failure. The presence of out-of-plane loads and cutouts reduced the axial load carrying capacity of the stiffened composite plates.
玻璃纤维增强聚合物（GFRP）复合材料的高强度重量比和耐腐蚀性能使其有可能非常适合应用于船舶结构、桥梁和海上石油平台。这些结构通常由加劲板构成，并承受轴向载荷和面外载荷。在板上设置切口和开口用于检修和维护。本研究的主要目的是研究带有方形切口的GFRP加劲复合板在轴向和面外载荷组合作用下直至破坏的屈曲行为。使用玻璃纤维和环氧树脂，通过将加劲肋作为翼缘板的连续铺层，制作了四块无切口的叶片加劲复合板和四块有方形切口的叶片加劲复合板。测量了初始几何缺陷，并根据测量结果计算了板缺陷（Δx）、加劲肋缺陷（Δsy）和整体缺陷（Δsx）。对所有制作的加劲复合板进行了直至破坏的测试。在ANSYS软件中建立了有限元模型，并与实验结果进行了验证。观察到GFRP加劲复合板通过加劲肋压缩/加劲肋拉伸破坏模式失效。面外载荷和切口的存在降低了加劲复合板的轴向承载能力。
