The coupling between tensile stress and water diffusion in composites represents a major issue in many marine applications. Even if these two behaviours are well documented as separate subjects, there are still very few data on fully coupled mechanisms. The aim of this study is to understand what governs the coupled behaviour, by investigating the water diffusion in carbon/epoxy. The coupling is first evaluated on neat resin samples to characterise the matrix behaviour. Then the study focuses on composites with two types of woven fibre orientation: one at ±45°, in order to understand the coupling effects on materials loaded away from the reinforcement direction and another quasi-isotropic to obtain properties along the fibres. For each material the same approach was applied: first, the tensile behaviour, damage development and water diffusion were studied uncoupled. Then, semi-coupled effects were investigated. The final part of the paper combines both behaviours as fully coupled phenomena.

复合材料中拉伸应力和水扩散之间的耦合是许多海洋应用中的主要问题。即使将这两种行为作为独立的主题进行了充分的文献记录，有关完全耦合的机制的数据仍然很少。这项研究的目的是通过研究水在碳/环氧树脂中的扩散来了解什么决定了耦合行为。首先在纯树脂样品上评估偶联，以表征基质行为。然后，研究集中在两种类型的机织纤维取向复合材料上：一种在±45°，以了解对远离增强方向加载的材料的耦合效应，另一种准各向同性，以沿纤维获得性能。对于每种材料，都采用相同的方法：首先，拉伸行为 破坏发展和水扩散是分开研究的。然后，研究了半耦合效应。本文的最后部分将两种行为结合为完全耦合的现象。