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详细介绍了评估三维玻璃纤维增强聚合物(玻璃钢)夹芯板的双向弯曲的性能试验。该板由带有泡沫核心的玻璃钢外观和沿厚度方向插入的纤维构成。这些板的单向弯曲性能相对容易理解,然而,对其双向弯曲性能研究较少。本文试验目的是评估集中荷载下纤维的插入形式和板厚对双向弯曲性能的影响。用试验结果来验证非线性、静力有限元模型,这个模型引进一种简单方法预测反应。这种实测和预测的反应结果表明,在小挠度情况下,板以弯曲反应为主而大挠度以膜反应为主。用有限元分析进一步研究不同参数的影响,这些参数在试验中都没有进行测定。参数化研究表明,增加板的相对弯曲或剪切刚度能改变板的弯曲机理从而减少膜反应承载的百分比。
The performance test to evaluate the bidirectional bending of 3D glass fiber reinforced polymer (FRP) sandwich panels is introduced in detail. The panel consists of a fiberglass with foam core appearance and fibers inserted in the thickness direction. The unidirectional bending behavior of these panels is relatively easy to understand, however, less research has been devoted to their two-way bending properties. The purpose of this paper is to evaluate the influence of fiber insertion and plate thickness on the bi-directional bending behavior under concentrated load. The experimental results were used to validate the nonlinear and static finite element model. The model introduced a simple method to predict the reaction. The measured and predicted results show that in the case of small deflection, the plate is dominated by the bending reaction and the large deflection is dominated by the membrane reaction. Finite element analysis was used to further study the influence of different parameters, which were not measured in the test. Parametric studies show that increasing the relative bending or shearing stiffness of the plate can change the bending mechanism of the plate and thus reduce the percentage of membrane reaction loading.