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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Bioinspired structures for core sandwich composites produced by fused deposition modelling
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Bioinspired structures for core sandwich composites produced by fused deposition modelling

机译：通过熔融沉积建模生产的芯三明治复合材料的生物启发结构

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摘要

Sandwich panels are widely used in many engineering applications where saving weight while maintaining high strength and stiffness is required. The most common core structure in sandwich panels is the two-dimensional regular hexagonal cell shape, denoted as Honeycomb. In recent times, bioinspired materials and structures have become increasingly attractive to researchers, as they provide adequate functional properties. The goal of the present work is to study two new bioinspired structures aimed at improving the performance of sandwich panel cores. Among all the large amount of structures that nature provides, two novel cores inspired in the structures of enamel and of bamboo were chosen. The compressive and flexural properties of these two innovative cellular structures were assessed and compared with the classic honeycomb. All the arrangements were numerically simulated for different relative densities. The fused deposition modelling technique enables to print selected samples in polylactic acid that were experimentally tested in compression and in bending. Results show that the mechanical properties depend strongly on the core geometry, on the relative density and on the cell thickness distribution. A satisfactory agreement was found between finite element results and experimental data. For the same relative density, the bioinspired natural structures proposed in the present study are potential competitors with the traditional core structures in what concerns strength, stiffness and energy absorption.
机译：夹心板被广泛用于许多工程应用中，这些应用要求在减轻重量的同时保持高强度和刚度。夹心板中最常见的核心结构是二维规则的六边形小室形状，表示为蜂窝状。近年来，受生物启发的材料和结构具有足够的功能特性，因此对研究人员越来越有吸引力。本工作的目的是研究两种旨在改善夹芯板芯性能的新型生物启发结构。在大自然提供的大量结构中，选择了两个在珐琅和竹子结构中得到启发的新颖核心。评估了这两个创新的蜂窝结构的压缩和弯曲特性，并与经典蜂窝进行了比较。针对不同的相对密度，对所有布置进行了数值模拟。熔融沉积建模技术能够在聚乳酸中打印选定的样品，这些样品在压缩和弯曲条件下进行了实验测试。结果表明，机械性能在很大程度上取决于芯的几何形状，相对密度和孔厚度分布。在有限元结果和实验数据之间找到了令人满意的协议。对于相同的相对密度，在研究中提出的具有生物启发性的自然结构在强度，刚度和能量吸收方面是与传统核心结构潜在的竞争者。

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