Dhakal Hom Nath, Méner Elwan Le, Feldner Marc, Jiang Chulin, Zhang Zhongyi
Advanced Materials and Manufacturing (AMM) Research Group, School of Mechanical and Design Engineering, University of Portsmouth, Anglesea Road, Anglesea Building, Portsmouth, Hampshire PO1 3DJ, UK.
Polymers (Basel). 2020 Apr 3;12(4):806. doi: 10.3390/polym12040806.
Understanding the damage mechanisms of composite materials requires detailed mapping of the failure behaviour using reliable techniques. This research focuses on an evaluation of the low-velocity falling weight impact damage behaviour of flax-basalt/vinyl ester (VE) hybrid composites. Incident impact energies under three different energy levels (50, 60, and 70 Joules) were employed to cause complete perforation in order to characterise different impact damage parameters, such as energy absorption characteristics, and damage modes and mechanisms. In addition, the water absorption behaviour of flax and flax basalt hybrid composites and its effects on the impact damage performance were also investigated. All the samples subjected to different incident energies were characterised using non-destructive techniques, such as scanning electron microscopy (SEM) and X-ray computed micro-tomography (πCT), to assess the damage mechanisms of studied flax/VE and flax/basalt/VE hybrid composites. The experimental results showed that the basalt hybrid system had a high impact energy and peak load compared to the flax/VE composite without hybridisation, indicating that a hybrid approach is a promising strategy for enhancing the toughness properties of natural fibre composites. The πCT and SEM images revealed that the failure modes observed for flax and flax basalt hybrid composites were a combination of matrix cracking, delamination, fibre breakage, and fibre pull out.
了解复合材料的损伤机制需要使用可靠的技术对失效行为进行详细测绘。本研究重点评估亚麻-玄武岩/乙烯基酯（VE）混杂复合材料的低速落锤冲击损伤行为。采用三种不同能量水平（50、60和70焦耳）的入射冲击能量来造成完全穿孔，以表征不同的冲击损伤参数，如能量吸收特性以及损伤模式和机制。此外，还研究了亚麻和亚麻-玄武岩混杂复合材料的吸水行为及其对冲击损伤性能的影响。使用无损技术，如扫描电子显微镜（SEM）和X射线计算机显微断层扫描（πCT），对所有经受不同入射能量的样品进行表征，以评估所研究的亚麻/VE和亚麻/玄武岩/VE混杂复合材料的损伤机制。实验结果表明，与未混杂的亚麻/VE复合材料相比，玄武岩混杂体系具有较高的冲击能量和峰值载荷，这表明混杂方法是提高天然纤维复合材料韧性性能的一种有前景的策略。πCT和SEM图像显示，亚麻和亚麻-玄武岩混杂复合材料观察到的失效模式是基体开裂、分层、纤维断裂和纤维拔出的组合。
