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On the Dynamic Performance of Flax Fiber Composite Beams Manufactured at Different Relative Humidity Levels

机译：在不同相对湿度水平制造的亚麻纤维复合梁的动态性能

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Development of environment-friendly natural fiber composites has been a recent trend. However, due to the fact that natural fibers permit high level of moisture absorption from the surroundings, it can lead to weak bindings and degradation of composite properties. This paper presents an experimental study on the dynamic performance of flax fiber composite beams manufactured at different relative humidity (RH) levels. Five types of flax fiber-reinforced composite materials were made under different RH values, i.e., dry, 35%, 50%, 70%, and 95% RH, and beam samples were prepared using the composite. Impact hammer testing was conducted to measure the natural frequencies and damping of the beams. It was found that for the first three modes, while the resonant frequencies are very close for most samples, there is a clear drop of frequencies for the composite fabricated at 95% RH. Along with an increase of the RH level, the damping ratios for all the three modes have reported a slight increase, but the variation is not significant.
机译：环境友好型天然纤维复合材料的发展是最近的趋势。然而，由于天然纤维允许从周围环境允许高水平的吸湿性，它可以导致复合性能的弱结合和降解。本文介绍了不同相对湿度（RH）水平制造的亚麻纤维复合梁动态性能的实验研究。使用复合材料制备五种类型的亚麻纤维增强复合材料，即干燥，35％，50％，70％和95％RH和光束样品。进行冲击锤测试以测量梁的固有频率和阻尼。结果发现，对于前三种模式，虽然谐振频率非常接近大多数样品，但是在95％RH下制造的复合材料存在透明频率。随着RH水平的增加，所有三种模式的阻尼比率报告略有增加，但变化并不重要。

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