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Study of the moisture/stress effects on glass fibre/epoxy composite and the impact of the interphase area

机译：研究水分/应力对玻璃纤维/环氧树脂复合材料的影响以及相间区域的影响

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This paper shows the influence of interphase areas in a UD glass fibre/epoxy composite on water diffusion process and mechanical properties thanks to experimental, analytical and numerical analysis. The interphase is first characterized in terms of molecular mobility by micro-thermal analysis and in terms of mechanical properties by force measurements with atomic force microscopy. The measurements show an increase in elastic modulus and in glass transition temperature around each fibre. Optical microscopy reveals an important heterogeneity of fibre distribution inside the matrix with many contacts between fibres. A realistic microstructure including the interphase size (defined by μTA) and fibre distribution has then been considered to model the composite accurately. Diffusion parameters resulting from water absorption measurements on both the resin and the composite were also used in the finite element analysis. The comparison between experimental data, analytical and finite element models shows that the water diffusion coefficient is about five times higher in the interphase area than in the matrix whereas the gradient in modulus around the fibres barely modify the composite mechanical response.
机译：本文通过实验，分析和数值分析显示了UD玻璃纤维/环氧树脂复合材料中相间区域对水扩散过程和力学性能的影响。首先通过微热分析以分子迁移率为特征，通过原子力显微镜的力测量以力学性能为特征。测量结果表明，每种纤维周围的弹性模量和玻璃化转变温度均增加。光学显微镜揭示了基质内部纤维分布的重要异质性，其中纤维之间有许多接触。然后考虑了包括相间尺寸（由μTA定义）和纤维分布的实际微观结构，以对复合材料进行精确建模。树脂和复合材料的吸水率测量结果得出的扩散参数也用于有限元分析。实验数据，分析模型和有限元模型之间的比较表明，相间区域的水扩散系数约为基质的五倍，而纤维周围模量的梯度几乎不会改变复合材料的机械响应。

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