A low-velocity impact characterisation of a sustainable sandwich panel based on upcycled bottle caps as circular honeycomb is conducted. The recycled core aims to develop an alternative route of reusing waste bottle caps disposed in landfills. Ecological alternatives to skin (recycled PET foil) and adhesive (bio-polyurethane) are also compared with classic components (aluminium skin and epoxy polymer). A low-cost reinforcement (cement particles) is also proposed to enhance the mechanical strength of the panel. The samples are tested at several levels of impact energy, according to the type of skin, to observe their effect on mechanical behaviour. Metal skins achieve higher impact loads and energy absorption compared to PET foil. The bio-adhesive leads to a similar or enhanced maximum impact load and energy absorption compared to the epoxy adhesive. Specific properties highlight the promising performance of the bio-based adhesive with aluminium skins, reaching increments of up to 378%. The cement increases the maximum load and reduces the duration of the impact event, leading to lower energy absorption. The unreinforced epoxy polymer shows a visible adhesive peeling off from aluminium skin, while particle inclusions lead to reduced overall delamination. Biopolymer exhibits marginal adhesive debonding and stable deformation, revealing a progressive failure. In general, PET samples show core shear failure due to rupture of the skin. Crack propagation in PET samples made with biopolymer adhesive is reduced at lower energy levels. The results evidence the promising application of bottle caps in a more sustainable honeycomb core to build eco-friendly structures.

进行了可持续升级的夹心板的低速冲击表征，该板基于升级后的瓶盖为圆形蜂窝状。循环再利用的核心旨在开发一种替代方法，以重复利用放置在垃圾填埋场中的废瓶盖。皮肤（再生PET箔）和粘合剂（生物聚氨酯）的生态替代品也与经典成分（铝皮肤和环氧聚合物）进行了比较。还提出了一种低成本的增强材料（水泥颗粒）来增强面板的机械强度。根据皮肤的类型，在几种冲击能量水平下测试样品，以观察其对机械性能的影响。与PET箔相比，金属蒙皮可实现更高的冲击载荷和能量吸收。与环氧粘合剂相比，生物粘合剂导致相似或增强的最大冲击负荷和能量吸收。特殊性能突出了铝基生物基粘合剂的有前途的性能，达到了高达378％的增量。水泥增加了最大载荷，并减少了冲击事件的持续时间，从而降低了能量吸收。未增强的环氧聚合物显示出可见的粘合剂从铝皮上剥落，而颗粒夹杂物导致总体分层减少。生物聚合物表现出少量的粘合剂脱粘和稳定的变形，显示出进行性破坏。通常，PET样品显示由于皮肤破裂而导致的核心剪切破坏。在较低的能量水平下，用生物聚合物粘合剂制成的PET样品中的裂纹扩展得以减少。结果证明了瓶盖在更可持续的蜂窝芯中有望用于建造生态友好型结构的有希望的应用。