6533b82bfe1ef96bd128d905
RESEARCH PRODUCT
Fracture Toughness of Hydrothermally Aged Epoxy Systems with Different Crosslink Density
Michele ScafidiSabina AlessiMaria Di FilippoGiuseppe PitarresiAndrea Toscanosubject
Materials sciencePhotoelastic Stress AnalysiImage AnalysiComposite numberPhotoelastic Stress AnalysisStress (mechanics)Thermosetting ResinFracture toughnessEngineering (all)Fracture ToughnessHydrothermal AgingFracture Toughness; Hydrothermal Aging; Image Analysis; Photoelastic Stress Analysis; Swelling Stresses; Thermosetting Resin; Engineering (all)Composite materialEngineering(all)Image Analysis.General MedicineEpoxyDynamic mechanical analysisFracture ToughneSwelling StresseSwelling Stressesvisual_artvisual_art.visual_art_mediumFracture (geology)Gravimetric analysisGlass transitiondescription
Abstract The present work investigates the fracture toughness behaviour of Single Edge Notched Bending (SENB) samples of epoxy systems subject to water uptake aging. Two epoxy systems with a significantly different Glass Transition Temperature, T g , are in particular considered: a typical commercial non-aeronautical grade resin matrix for composite applications, reaching a T g of 90 °C, and a DGEBA+DDS epoxy system achieving a T g of 230 °C.The materials have been conditioned by hydrothermal aging in a thermal bath at the temperature of 50 °C. TransmissionPhotoelastic Stress Analysisis carried outon SENB samples during water aging, monitoring the presence and evolution of swelling stresses. The K IC Fracture toughness is measured and correlated with the internal stress field, with the water diffusion kinetics evaluated by gravimetric tests, and with the data from DMTA analyses. Results have highlighted significant differences in the fracture behaviour ofthe two epoxy systems.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-01-01 |