Hygrothermal aging behaviour of VARTMed three-dimensional braided carbon-epoxy composites under external stresses

Radial pressure and thickness effects on the moisture diffusion in hollow composite cylinders

“…It was actually shown, for instance, by Wan et al [26] that the application of a mechanical loading did not change the Fickian kinetic of moisture sorption by polymers. However, the same article reports that the application of a mechanical loading on epoxy resin composites induced a change of both the maximum moisture absorption capacity and the moisture coefficient diffusion, consistent with the free-volume theory developed in this work.…”

“…The maximum moisture absorption capacity M m !e for a strained epoxy satisfies (see for instance [22] and the more recent article of Wan et al [26] where q w and q m are, respectively, the densities of the water and matrix, whereas M m 1 0 stands for the maximum moisture absorption capacity of the unstrained epoxy.…”

“…In this field of research, the most recent investigations [15][16][17][18][19] focus upon taking into account, in the theoretical approaches, various features of hygro-mechanical coupling, especially the dependence of both the moisture diffusion coefficient and the maximum moisture absorption capacity on the mechanical states (strains and stresses), as shown, for instance, in [20][21][22][23][24]. More recent works, made by Autran et al [25] and Wan et al [26], have experimentally demonstrated the influence of mechanical loading on the moisture diffusion behavior.…”

Aging effect on thermal, mechanical and tribological behaviour of polymeric coatings used for pipeline application

“…Many authors (Pegoretti and Penati, 2004;Earl and Shenoi, 2004;Wan et al, 2005;Guadagno et al, 1999;De'Nève and Shanahan, 1993;Boukhoulda et al, 2006) have proved that aging can affect severely the material behaviour and have discussed the aging effect on material structure. It was found, for example, that glass transition temperature (T g ) decreases slightly with aging duration and was ascribed to the plasticization phenomenon (Sauvant-Moynot et al, 2002;Earl and Shenoi, 2004), which often leads to the degradation of mechanical properties.…”

“…Tested materials have been subjected to accelerated aging conditions during several months for both UV (Attwood et al, 2006;Morel et al, 2005;Marek et al, 2006;Sınmazç elik and Yılmaz, 2007) and hygrothermal aging (Han and Nairn, 2003;Pegoretti and Penati, 2004;Earl and Shenoi, 2004;Wan et al, 2005;Guadagno et al, 1999;De'Nève and Shanahan, 1993). Moreover, various studies concerning hygrothermal polymer degradation have been carried out (De'Nève and Shanahan, 1993), focusing mainly on the kinetic study of the degradation.…”