In this paper, the impact behaviour of sandwich panels constructed of flax fibre-reinforced polymer (FFRP) facings and closed cell polyisocyanurate foam cores is studied. A total of 27 sandwich beam specimens (1200 mm long and 150 mm wide) made of 75 mm thick foam have been fabricated. As a part of this study, three of these specimens have been tested under impact load at several energy levels. The main test parameter is the facing thickness (one, two, or three layers of FFRP). A bidirectional flax fabric (400 g/m2) was used for the face sheets and a foam with a density of 64 kg/m3 was used for the core. A bio-based epoxy resin, with an approximate bio-content of 30%, was used to make the FRP facings. Each specimen was tested multiple times increasing the kinetic energy until failure. The kinetic energy was increased by first increasing the drop height and then, if necessary, adding additional weight to the impactor and resetting the height to keep the increase in energy constant. The acceleration of the impactor, the drop weight velocity, and the top and bottom facing strains at mid-span will be measured. It is expected that ultimate energy absorption and strength of the specimens will increase as both the core density and facing thickness increase. The aim of this paper is to provide data to the field of study, provide insight into the structural behavior of these types of structures, and show their viability for use in infrastructure. With further research, there is the potential that these types of structures could be included in structural building codes. This research is part of a larger on-going study and more results will be available at the time of the conference.
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机译：本文研究了由亚麻纤维增强聚合物（FFRP）饰面和闭孔聚异氰脲酸酯泡沫芯构成的夹芯板的冲击性能。总共制造了27个由75毫米厚的泡沫制成的夹层梁试样（长1200毫米，宽150毫米）。作为这项研究的一部分，已经在几个能量水平的冲击载荷下测试了其中三个样品。主要测试参数是饰面厚度（一层，两层或三层FFRP）。面板使用双向亚麻织物（400 g / m2），芯使用密度为64 kg / m3的泡沫。使用生物含量约为30％的生物基环氧树脂制成FRP饰面。每个样品进行了多次测试，以增加动能直至失效。通过首先增加下落高度，然后，如果有必要，向冲击器增加额外的重量并重置高度以保持能量的增加，来增加动能。将测量撞击器的加速度，下降重量速度以及中跨的顶部和底部朝向应变。预计随着核心密度和饰面厚度的增加，样品的最终能量吸收和强度将增加。本文的目的是为研究领域提供数据，深入了解这些类型结构的结构行为，并展示其在基础设施中使用的可行性。随着进一步的研究，这些类型的结构可能会包含在结构建筑法规中。这项研究是一项正在进行的较大研究的一部分，在会议召开时将有更多结果可用。
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