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A mechanical degradation model for bidirectional natural fiber reinforced composites under hydrothermal ageing and applying in buckling and vibration analysis

机译：双向天然纤维增强复合材料水热老化的机械降解模型及其在屈曲和振动分析中的应用

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摘要

Natural fiber reinforced composites may have a great potential applications in the automotive and aerospace industries. Hydrothermal ageing in natural fiber reinforced composites leads to significantly degradation of their mechanical properties. This paper proposes a theoretical model for predicting the mechanical responses of bidirectional natural fiber reinforced composites under hydrothermal loading. Nine elastic coefficients of orthotropic composites after hydrothermal reaction and moisture absorption are obtained. Based on the present model, closed-form solutions for buckling load and frequency of a simply supported composite plate are derived. It is found that the elastic module and buckling load decrease monotonously with time, and approaches to a certain value with time. However, the frequency decreases with time firstly, and then increases with time, finally approaches to a certain value with time. In addition, the degradation of elastic modulus, buckling load and frequency for the composites with high fiber content are larger than those with low fiber content. This research may be helpful for designing natural fiber reinforced composites for applications in humid environments.
机译：天然纤维增强复合材料在汽车和航空航天工业中可能具有巨大的潜在应用。天然纤维增强复合材料的水热老化会导致其机械性能明显下降。本文提出了一个理论模型来预测双向天然纤维增强复合材料在水热载荷下的力学响应。得到水热反应和吸湿后的正交各向异性复合材料的九个弹性系数。基于当前模型，得出了简单支撑复合板屈曲载荷和频率的闭合形式解。结果表明，弹性模量和屈曲载荷随时间单调减小，随时间逐渐接近一定值。但是，频率随时间先减小，然后随时间增加，最后随时间接近某个值。另外，纤维含量高的复合材料的弹性模量，屈曲载荷和频率的降低要比纤维含量低的复合材料大。这项研究可能有助于设计用于潮湿环境的天然纤维增强复合材料。

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