The impact mitigation performance of novel single and double-layered kirigami corrugated (KC) claddings is investigated in this study via drop weight impact tests, as their significant improvements in energy absorption and crushing resistance were previously demonstrated over conventional corrugated structures. The feasibility of mass production on the proposed large-size KC core is also verified by applying conventional multi-stage mould pressing. A total of 15 different configurated single and double-layered KC cladding specimens are prepared and tested, where the effects of impacting speed, impacting mass, layer number, stacking configurations as well as graded design on the impact mitigation performance are considered. Impact force time histories, impact force-displacement curves, and transmitted force time histories at five different locations recorded using a custom-made measuring system are compared to evaluate the impact mitigating performance for the structure placed behind the proposed protective KC claddings. Transmitted force at centre is reduced by more than half as compared with the applied impact force for all double-layered KC claddings. Among the double-layered KC claddings, inverse symmetrically stacked KC cladding with no offset in the bottom layer, as well as the negatively graded KC claddings demonstrate a superior performance with a lower transmitted peak force at the centre and a more uniform force distribution transmitted to the support behind the claddings.

中文翻译：

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双层剪纸波纹覆层冲击载荷缓冲性能实验评价

本研究通过落锤冲击试验研究了新型单层和双层剪纸波纹 (KC) 覆层的冲击缓解性能，因为先前已证明其在能量吸收和抗压碎性方面比传统波纹结构有显着改进。通过应用传统的多阶段模压，也验证了所提出的大尺寸KC磁芯的批量生产的可行性。制备并测试了总共15个不同配置的单层和双层KC覆层试件，考虑了冲击速度、冲击质量、层数、堆叠配置以及分级设计对冲击缓解性能的影响。对使用定制测量系统记录的五个不同位置的冲击力时间历史、冲击力-位移曲线和传递力时间历史进行比较，以评估放置在建议的 KC 保护覆层后面的结构的冲击减轻性能。与所有双层 KC 包层所施加的冲击力相比，中心传递的力减少了一半以上。在双层KC包层中，底层无偏移的反对称堆叠KC包层以及负梯度KC包层表现出优越的性能，中心处传递的峰值力更低，传递到的力分布更均匀。包层后面的支撑。