Natural fiber composites have the potential to be widely applied as an alternative to or in combination with glass fiber composites in sustainable energy-absorbing structures. This study investigates the behavior of hemp fiber-reinforced vinylester composites when subjected to low-velocity impact loading by using an instrumented falling weight impact equipment. Different stacking sequences are tested, including a hybrid pattern resulting from a combination of natural and traditional glass fibers. Both penetration and indentation tests are performed. In the light of an increase in safety of green composite components and systems subjected to low-velocity impacts, next to the numerical models, the development of theoretical models is also useful and low time-consuming. Therefore, analytical models, available in the literature for traditional fiber-reinforced plastics and aimed at predicting the critical load of delamination onset, the indentation as a function of absorbed energy, as well as the approximation of the load–displacement curve, are used and implemented in this work. Good agreement was found between the theoretical predictions and experimental results.

中文翻译：

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大麻和大麻/玻璃热固性复合材料的低速冲击响应的分析建模和实验验证

天然纤维复合材料有可能在可持续吸能结构中作为玻璃纤维复合材料的替代品或与玻璃纤维复合材料结合而广泛应用。本研究通过使用仪表落锤冲击设备研究了大麻纤维增强乙烯基酯复合材料在受到低速冲击载荷时的行为。测试了不同的堆叠顺序，包括由天然和传统玻璃纤维组合产生的混合图案。进行渗透和压痕测试。鉴于受到低速冲击的绿色复合材料部件和系统的安全性增加，除了数值模型之外，理论模型的开发也是有用且耗时的。因此，分析模型，在传统纤维增强塑料的文献中可用，旨在预测分层开始的临界载荷，作为吸收能量函数的压痕，以及载荷 - 位移曲线的近似值，在这项工作中被使用和实施。在理论预测和实验结果之间发现了良好的一致性。