Characterizing the toughness of an epoxy resin after wet aging using compact tension specimens with non-uniform moisture content

An experimental–numerical investigation of hydrothermal response in adhesively bonded composite structures

“…28 The variations of the principal strain components extracted from the thermal simulation are converted into Bragg wavelength shifts using Eq. (4) and (5) and the relevant coefficients for the silica based optical fiber. The experimental data presented in Fig.…”

“…However, in spite of the expected weight reductions, the use of adhesive composite bonds in aeronautical applications is limited by the possible deterioration of the joint upon exposure to environmental contaminants and the lack of adequate techniques to monitor the durability of the bonded joints as structural components. Moisture contamination is probably the most studied scenario in polymers and composite materials [1][2][3][4][5] and numerous models have been proposed to describe the process [6][7][8][9]. Techniques based on electrical spectroscopy are able to give indications on water content [10].…”

Measurements of the effects of pure and salt water absorption on the rate-dependent response of an epoxy matrix

“…Several studies have been published on the effects of water absorption on different polymers (e.g. [6][7][8][9]), but to the best of our knowledge little research has been published, to date, on the effect of water exposure on the strain rate sensitivity [10][11][12] of the resin. This study aims at filling this gap in the literature, while providing a comprehensive dataset to guide FRP material design and to calibrate constitutive models used in numerical simulations.…”

“…Several authors studied the mechanisms of diffusion of water in different polymers; for some, diffusion has been observed to be in accordance to Fick's law [23,26], while for others such law was not adequate [27], [28]. Water absorption can modify several properties of polymers, such as glass transition temperature (Tg) [22], stiffness [29,30], tensile strength [29,31] and fracture toughness [8,32]. It also induces notable hygroscopic strains [9,23,33,34].…”

Stress-strain analysis of specimens subjected to tensile loading during moisture uptake

“…Some crosscoupling effects can occur. Coupling between heterogeneous wet conditions and mechanical behaviour is especially important when it comes to the identification of material properties on samples that cannot be considered as homogeneous (Quino et al 2014), (Yagoubi et al 2012). Meanwhile in given research coupling between the diffusion and the mechanical stress state is not taken into account as a first approach and should be added later on next step.…”