Shen Yiou, Zhong Junjie, Cai Shenming, Ma Hao, Qu Zehua, Guo Yichun, Li Yan
School of Aerospace Engineering and Applied Mechanics, Tongji University, 1239 Siping Road, Shanghai 200092, China.
Department of Macromolecular Science, Fudan University, 2005 Songhu Road, Shanghai 200433, China.
Materials (Basel). 2019 Feb 1;12(3):453. doi: 10.3390/ma12030453.
Temperature and moisture can cause degradation to the impact properties of plant fiber-based composites owing to their complex chemical composition and multi-layer microstructure. This study focused on experimental characterization of the effect of important influencing factors, including manufacturing process temperature, exposure temperature, and water absorption, on the impact damage threshold and damage mechanisms of flax fiber reinforced composites. Firstly, serious reduction on the impact damage threshold and damage resistance was observed, this indicated excessive temperature can cause chemical decomposition and structural damage to flax fiber. It was also shown that a moderate high temperature resulted in lower impact damage threshold. Moreover, a small amount of water absorption could slightly improve the damage threshold load and the damage resistance. However, more water uptake caused severe degradation on the composite interface and structural damage of flax fiber, which reduced the impact performance of flax fiber reinforced composites.
由于植物纤维基复合材料复杂的化学成分和多层微观结构，温度和湿度会导致其冲击性能下降。本研究聚焦于重要影响因素，包括制造工艺温度、暴露温度和吸水率，对亚麻纤维增强复合材料的冲击损伤阈值和损伤机制的影响进行实验表征。首先，观察到冲击损伤阈值和抗损伤能力严重降低，这表明过高的温度会导致亚麻纤维发生化学分解和结构破坏。研究还表明，适度的高温会导致较低的冲击损伤阈值。此外，少量的吸水可略微提高损伤阈值载荷和抗损伤能力。然而，更多的水分吸收会导致复合材料界面严重降解以及亚麻纤维的结构破坏，从而降低亚麻纤维增强复合材料的冲击性能。
