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| Sar, B. E.; Freour, S.; Davies, Peter; Jacquemin, Frederic. |
| A thermodynamical approach, based on the definition of the chemical potential of water, is used in order to establish a model coupling the diffusion of moisture to the mechanical behaviour of a polymer. The model takes into account the evolution, occurring during the diffusion process, of both the density of the polymer and its maximum moisture absorption capacity. The approach developed is applied to symmetric loading cases, in terms of relative humidity and external pressure. The model, established in the present work, provides the water content profiles through the thickness of the polymer throughout the transient phase of the diffusion process. The numerical results obtained show the significant effect of an external pressure on the kinetics of... |
| Tipo: Text |
Palavras-chave: Hygromechanical coupling; Moisture absorption; Thermodynamical approach. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00088/19932/17755.pdf |
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| Humeau, Corentin; Davies, Peter; Jacquemin, Frederic. |
| 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... |
| Tipo: Text |
Palavras-chave: Composite; Moisture diffusion; Static tensile stress; Coupled behaviour. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00416/52788/53687.pdf |
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| Casari, Pascal; Jacquemin, Frederic; Davies, Peter. |
| This paper presents a method for the characterization of residual stresses in thick filament wound tubes. The three materials considered in the study are wet wound epoxy composite tubes based on E glass, R glass and T700 carbon fibres with three winding angles, [+/- 35], [+/- 55] and [+/- 851 with respect to the longitudinal axis. The aim of the present work is to measure internal stresses, based on strains liberated by cutting composite tubes, and to compare results with predictions from a residual stress model based on the classical equations of solid mechanics. This leads to a simple technique which allows the quick identification of the effects of manufacturing and moisture on the internal multi-axial stress level. |
| Tipo: Text |
Palavras-chave: Moisture; Tube; Composite; Residual stress. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1212.pdf |
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