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Enhancing the resistance of composite sandwich panels to localized forces for civil infrastructure and transportation applications

机译：增强复合夹芯板对民用基础设施和运输应用中局部力的抵抗力

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摘要

This paper presents the details of an experimental and numerical study that was conducted to evaluate different methods of increasing the punching resistance of glass fiber reinforced polymer (GFRP) composite sandwich panels with balsa wood cores. A total of four large-scale panels were subjected to concentrated loads in a two-way bending configuration. Different techniques of locally stiffening the panels were investigated including bonding a steel coupling plate to the loaded surface of the panels and embedding steel tubes within the panel core. The experimental program was supplemented by a finite element study to evaluate the location, magnitude, and extent of stress concentrations in the panels. The experimental program demonstrated that the failure modes of the stiffened panels shifted from local punching to delamination of the loaded GFRP skin which initiated at the discontinuities of the panel stiffness. The finite element analysis indicated that the delamination failure was due to stress concentrations which formed at these critical locations. The local stiffening of the panel approximately tripled the concentrated load carrying capacity of the panels. The research findings suggest that, through careful design and detailing, composite sandwich panels can be used to resist large-magnitude concentrated loads such as those found in civil infrastructure and heavy freight transportation applications.
机译：本文详细介绍了一项实验和数值研究，以评估提高轻木芯玻璃纤维增​​强聚合物（GFRP）复合夹芯板的抗冲孔性的不同方法。总共四个大型面板以双向弯曲配置承受集中载荷。研究了使面板局部变硬的不同技术，包括将钢耦合板粘合到面板的加载表面上，以及将钢管嵌入面板芯内。通过有限元研究补充了实验程序，以评估面板中应力集中的位置，大小和程度。实验程序表明，加劲板的破坏模式从局部冲孔转变为已加载的GFRP蒙皮的分层，这是在面板刚度不连续时开始的。有限元分析表明，分层失败是由于在这些关键位置形成的应力集中所致。面板的局部刚度大约使面板的集中负荷承载能力增加了两倍。研究发现表明，通过仔细的设计和细节设计，复合材料夹芯板可用于抵抗大幅度集中的载荷，例如在民用基础设施和重型货运应用中发现的载荷。

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