Search results for "Moisture desorption"

showing 3 items of 3 documents

On the response of flax fiber reinforced composites under salt-fog/dry conditions: Reversible and irreversible performances degradation

2022

Abstract Despite their scarce resistance to humid or wet conditions, natural fiber reinforced composites (NFRCs) seem to be able to partially recover their performances under discontinuous exposition to marine environment. To investigate this peculiarity, flax fiber reinforced composite was at first subjected to salt-fog spray condition at 35 °C for 15 and 30 days, respectively, and then stored in ‘‘dry” condition (i.e., 50% R.H. and 22 °C) between 0 and 21 days. The performances evolution was evaluated through flexural tests, water uptake and contact angle measurements. Moreover, the morphology of fractured mechanical samples was examined by using 3D optical microscope and scanning electro…

D. Mechanical testingMaterials scienceScanning electron microscopeMechanical EngineeringComposite numberIndustrial and Manufacturing EngineeringA. Polymer-matrix composites (PMCs); B. Environmental degradation; D. Mechanical testing; Moisture desorptionlaw.inventionContact angleA. Polymer-matrix composites (PMCs)Settore ING-IND/22 - Scienza E Tecnologia Dei MaterialiOptical microscopeFlexural strengthMoisture desorptionMechanics of MaterialslawPhase (matter)Ceramics and CompositesDegradation (geology)B. Environmental degradationComposite materialNatural fiber
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An experimental investigation on performances recovery of glass fiber reinforced composites exposed to a salt-fog/dry cycle

2023

The main goal of this paper is the evaluation of the properties reversibility of glass fiber reinforced polymers (GFRPs) under discontinuous exposure to aggressive environmental conditions, typical of marine applications. To this aim, the GFRP manufactured through vacuum infusion process has been initially aged in humid conditions (i.e., exposure to salt-fog at 35 ◦C) for 15 and 30 days and then stored under controlled dry conditions (i.e., 50% R.H. and 23 ◦C) for times varying between 0 and 21 days. In order to evaluate the recover capability of this material, its water uptake has been monitored along the quasi-static flexural properties during the entire humid/dry cycle. Moreover, both 3D…

Polymer-matrix composites (PMCs)Settore ING-IND/22 - Scienza E Tecnologia Dei MaterialiMoisture desorptionMechanics of MaterialsMechanical EngineeringGlass fibers.Ceramics and CompositesMechanical testingIndustrial and Manufacturing EngineeringEnvironmental degradationComposites Part B: Engineering
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Assessment of performance degradation of hybrid flax-glass fiber reinforced epoxy composites during a salt spray fog/dry aging cycle

2022

The main goal of this paper is the evaluation of the performances reversibility of hybrid composites when they are dried after being aged in salt-fog environment. To this aim, epoxy composites reinforced with flax and glass fabrics respectively in the internal and external laminae were at first exposed to salt-fog (i.e., identified as wet phase) and then stored in controlled conditions (i.e., identified as dry phase). The flexural properties evolution of these composites as well as their water uptake and contact angle were monitored at varying time of both phases. The flexural strength and modulus of hybrid composites is 23.4% (17.9%) and 15.5% (12.9%) lower than unaged ones after 30 (15) d…

Settore ING-IND/22 - Scienza E Tecnologia Dei MaterialiMechanics of MaterialsMechanical EngineeringCeramics and CompositesIndustrial and Manufacturing EngineeringEnvironmental degradation Hybrid composites Mechanical testing Moisture desorption Polymer-matrix composites (PMCs)
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