https://orcid.org/0000-0002-6021-4284
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ABSTRACT
The unremitting quest of natural and renewable materials able to replace their synthetic counterparts in high-performance applications has involved also sandwich structures. In this regard, the aim of this work is to characterize the impact response, in both high- and low-velocity conditions, of green sandwich structures made of agglomerated cork as core and flax/epoxy laminates as face sheets. Both bare cork, flax skins, and complete sandwich structures were subjected to impacts at three different energy levels representing the 25%, 50%, and 75% of the respective perforation thresholds. A gas gun was instead used to assess the high-velocity impact behavior of these green sandwich structures and evaluate their ballistic limit. This study shows that the buckling of cell walls of agglomerated cork enables to tailor the damage extension through-the-thickness in low-velocity impacts compared to traditional synthetic foams coupled with a considerable amount of energy absorption.
摘要
在高性能应用中，天然材料和可再生材料能够替代它们的合成材料的不懈探索也涉及到夹层结构。在这方面，这项工作的目的是表征冲击响应，在高和低速条件下，绿色夹层结构，以结块软木为核心，亚麻/环氧树脂层板作为面板。裸软木、亚麻皮和完整的夹层结构受到三种不同能量水平的影响，分别代表各自穿孔阈值的25%、50%和75%。而是用气枪来评估这些绿色夹层结构的高速撞击行为，并评估它们的弹道极限。这项研究表明，结块软木的细胞壁的屈曲能够在低速冲击下，通过与厚度相当大的能量吸收相结合的传统合成泡沫来调整损伤延伸。