Details

Autor(en) / Beteiligte

• Das, Partha Pratim
• Vadlamudi, Vamsee
• Raihan, Rassel

Titel

Dielectric state variables as qualitative indicators of moisture absorption-caused mechanical property degradation in GFRP composite structures

Ist Teil von

• Composites. Part C, Open access, 2022-10, Vol.9, p.100295, Article 100295

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Moisture induces mechanical strength degradation in FRP composites by altering chemical formulation of the matrix.•Dielectric properties change as moisture is absorbed in FRP composites.•Dielectric analysis in lower frequency (<1000 Hz) region can detect associated polarizations (ionic, interfacial polarization) depicting the moisture-induced effects.•Dielectric properties can be empirically correlated to the mechanical degradation indicators. Fiber reinforced polymer (FRP) composites are being used in numerous fields owing to their intrinsic strength to weight ratio and various design benefits. However, these materials are prone to environmental aging, particularly moisture absorption. In essence, absorbed moisture infiltrates the polymer matrix and induces changes in the polymer network through chain scission, plasticization, and other bonding interactions. This causes irreversible damages to the material and significantly decreases mechanical strength. In this study, Broadband Dielectric Spectroscopy (BbDS) has been used to identify the absorption mechanisms in glass fiber reinforced polymer (GFRP) composites by detecting the related polarization mechanisms. Here, results show an increase in the real permittivity and dielectric relaxation strength of the material with moisture absorption and attaining a steady-state once absorption approaches saturation. In this work, moisture-induced degradation of tensile and flexural properties of the material have also been studied and a correlation has been found to exist between the dielectric state variables, absorbed moisture, and the mechanical properties of the material. The correlation resolves the integration of the different material physics involved here and can be used to empirically predict the residual strength of a composite structure using the non-destructive broadband dielectric characterization technique.