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Buckling load prediction of grid-stiffened composite cylindrical shells using the vibration correlation technique
Composites Science and Technology ( IF 9.1 ) Pub Date : 2018-10-01 , DOI: 10.1016/j.compscitech.2018.08.046
Davoud Shahgholian-Ghahfarokhi , Gholamhossein Rahimi

Abstract The vibration correlation technique (VCT) is one of the most important nondestructive methods to calculate the buckling load of imperfection sensitivity in thin-walled structures. VCT is widely used for beam and plate structures, but the technique is still under development for thin-walled shells. In this paper, an experimental and numerical validation of VCT approach was presented and discussed for the prediction of the buckling load of the grid-stiffened composite cylindrical shells loaded in compression. From the experimental point of view, three specimens were fabricated using a new silicone rubber mold, and specially-designed filament winding setup. The modal behavior of the grid-stiffened composite cylindrical shells was investigated by exciting the structures using modal hammer method in different applied compression load. Then, the variation of the first natural frequency of vibration with the applied compressive load was measured up to buckling during testing. Furthermore, a series of Finite Element Models (FEMs), including nonlinear effects such as geometric and thickness imperfection, are carried out in order to characterize the variation of the natural frequencies of vibration with the applied load and also compare it with the experimental results. Finally, the buckling test was performed to validate the experimental and numerical results of VCT approach. The results showed that the difference between the predicted buckling load using the VCT approach on the experimental results and numerical results with an experimental buckling load is 3.1% and 5.0%, respectively. Also, the current VCT approach has a very good correlation for grid-stiffened composite cylindrical shells when the maximum applied load is higher than 68% of the experimental buckling load.

中文翻译:

使用振动关联技术预测网格加筋复合圆柱壳的屈曲载荷

摘要 振动相关技术(VCT)是计算薄壁结构缺陷敏感性屈曲载荷最重要的无损方法之一。VCT 广泛用于梁和板结构,但该技术仍在开发用于薄壁壳。在本文中,提出并讨论了 VCT 方法的实验和数值验证,用于预测受压加载的网格加筋复合圆柱壳的屈曲载荷。从实验的角度来看,三个样品是使用新的硅橡胶模具和专门设计的长丝缠绕装置制造的。通过在不同的压缩载荷下使用模态锤法对结构进行激励,研究了网格加筋复合圆柱壳的模态行为。然后,在测试过程中测量了第一固有振动频率随施加的压缩载荷的变化,直至屈曲。此外,还进行了一系列有限元模型 (FEM),包括几何和厚度缺陷等非线性效应,以表征振动固有频率随施加载荷的变化,并将其与实验结果进行比较。最后,进行屈曲试验以验证 VCT 方法的实验和数值结果。结果表明,使用 VCT 方法对实验结果的预测屈曲载荷与具有实验屈曲载荷的数值结果之间的差异分别为 3.1% 和 5.0%。还,
更新日期:2018-10-01
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