Impact events are common in every-day life and can severely compromise the integrity and reliability of high-performing structures such as sandwich composites that are widespread in different industrial fields. Considering their susceptibility to impact damage and the environmental issues connected with their exploitation of synthetic materials, the present work aims to propose a bio-based sandwich structure with an agglomerated cork core and a flax/basalt intraply fabric as skin reinforcement and to address its main weakness, i.e. its impact response. In-service properties are influenced by temperature, therefore the effect of high (60 °C) and low (−40°C) temperatures on the impact behavior of the proposed structures was investigated and a suitable comparison with traditional (polyvinyl chloride) (PVC) foams was provided. The results highlighted the embrittlement effect of decreasing temperature on the impact resistance of the sole cores and skins and of the overall structures with a reduction in the perforation energy that shifted, in the last case, from 50–60 J at – 40 °C up to more than 180 J at 60 °C. A maleic anhydride coupling agent in the skins hindered fundamental energy dissipation mechanisms such as matrix plasticization, determining a reduction in the perforation threshold of all composites. In particular, neat polypropylene (PP) skins displayed a perforation energy of 20 J higher than compatibilized (PPC) ones at 60 °C, while agglomerated cork sandwich structures at 60 °C were characterized by a perforation threshold higher of at least 50 J.

撞击事件在日常生活中很常见，会严重损害高性能结构的完整性和可靠性，例如广泛应用于不同工业领域的夹层复合材料。考虑到它们对冲击损伤的敏感性以及与合成材料开发相关的环境问题，本工作旨在提出一种具有凝聚软木芯和亚麻/玄武岩内层织物作为表皮增强材料的生物基夹层结构，并解决其主要问题。弱点，即它的冲击反应。使用性能受温度影响，因此研究了高温 (60 °C) 和低温 (-40°C) 对所提议结构的冲击行为的影响，并与传统（聚氯乙烯）（PVC）进行了适当的比较) 提供了泡沫。结果强调了降低温度对鞋底核心和蒙皮以及整个结构的抗冲击性的脆化效应，穿孔能量降低，在最后一种情况下，在 – 40°C 时从 50-60 J 向上移动在 60 °C 时达到 180 J 以上。表皮中的马来酸酐偶联剂阻碍了基本的能量耗散机制，例如基体塑化，从而降低了所有复合材料的穿孔阈值。特别是，纯聚丙烯 (PP) 表皮在 60 °C 时的穿孔能量比增容 (PPC) 表皮高 20 J，而在 60 °C 下凝聚的软木夹层结构的穿孔阈值至少高于 50 J。