In several industrial sectors, structural composite materials with good impact resistance are required to design parts submitted to crashes or falling objects. This work analyses the impact behaviour of short hemp fibres reinforced biocomposites through mechanical measurements, high speed imaging and finite element modelling. A drop-weight impact machine was instrumented with a high speed camera to measure the propagation of macro-cracks and correlate it to the force-displacement dynamic response at several impact energy levels. PP-hemp composites exhibit higher absorbed energies (up to 40%) than PP-glass composites due to higher strain at break. The video tracking analysis highlights that for a given cumulated crack length, PP-hemp composite absorbs much more energy, related to differences in failure mechanisms. The developed finite element model is in good agreement with the experimental measurements and the fracture growth pattern, thus constituting a useful tool to predict the impact response of biocomposite parts.

在一些工业部门中，要求具有良好抗冲击性的结构复合材料来设计易受撞击或坠落物体的零件。这项工作通过机械测量，高速成像和有限元建模分析了短麻纤维增强生物复合材料的冲击行为。一台落锤式冲击机配备了高速相机，以测量宏观裂纹的传播，并将其与在多个冲击能级下的力-位移动态响应相关联。PP-大麻复合材料由于断裂应变较高，因此比PP-玻璃复合材料具有更高的吸收能（高达40％）。视频跟踪分析突出显示，对于给定的累积裂纹长度，PP麻复合材料吸收的能量更多，这与破坏机制的差异有关。