Abstract Sandwich plates with two thin stiff face-sheets and a soft center core have been used in many constructions for which the dominating load is transverse bending. Many theoretical/numerical analyses have been devoted to studying the deformation mechanism of such a structure. But relatively limited experimental investigations are present in this field and they are often self-content with little connection to the existing theoretical pursuits. In this paper, a composite sandwich structure made with carbon fiber woven face sheets and a relatively compliant foam core was loaded in 3-point bending. Images were captured of the specimen before and after deformation, which were then analyzed with a Digital Image Correlation (DIC) program. The full field displacements and strain fields were obtained for the specimen. The experimental deflection of the beam was compared with five theoretical models and one numerical solution. The result shows that only one model predicts the reality well.

中文翻译：

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夹心梁受弯全场试验分析与理论比较

摘要 夹心板具有两个薄的刚性面板和一个软中心芯，已用于许多主要载荷为横向弯曲的结构中。许多理论/数值分析致力于研究这种结构的变形机制。但是该领域的实验研究相对有限，而且它们往往自我满足，与现有的理论追求几乎没有联系。在本文中，由碳纤维编织面板和相对柔顺的泡沫芯制成的复合夹层结构以 3 点弯曲加载。在变形前后捕获样品的图像，然后使用数字图像相关 (DIC) 程序对其进行分析。获得了试样的全场位移和应变场。梁的实验挠度与五种理论模型和一种数值解进行了比较。结果表明，只有一种模型可以很好地预测现实。