Abstract
The purpose of this study is to assess the integrity of carbon-fibre reinforced plastics (CFRP) comprising of commercial and surface modified CFs through nanomechanical mapping protocol, towards the feasibility of nanoindentation tool as a quality assurance means in a composite manufacturing process. Carbon fibre surface modification was selected for enhancement of the wetting properties of carbon fibres in order to improve the adhesion force between the fibre and the polymer matrix. In all cases, epoxy resin was used as a matrix for the manufacturing of composite samples. Plastic deformation/elastic recovery were recorded (together with viscoelasticity and adhesion-discontinuities and fluctuations during measurement), while elastic modulus values are also mapped. Moreover, the resistance to applied load is assessed and compared for all cases.
Highlights
Carbon fibres (CFs) has been placed among reinforcement filler candidates with potential, whereas epoxy-based matrices are basically addressed for the manufacturing of composites, meeting a plethora of application target needs, i.e., from automotive to aeronautics, health, and structural/building constructions and processes
The nanoindentation tests were performed using a Hysitron (Minneapolis, MN, USA) TriboLab® Nanomechanical Test Instrument equipped with a Berkovich diamond indenter which allows the application of loads from 1 to 30,000 μN and records the displacement as a function of applied loads with a high load resolution (1 nN) and a high displacement resolution (0.04 nm)
The purpose of this study was to assess the integrity of carbon-fibre reinforced plastics (CFRP) comprising of commercial and surface modified carbon fibres (CFs) through a nanomechanical mapping protocol, towards the feasibility of a nanoindentation tool as a quality assurance means in a composite manufacturing process
Summary
Carbon fibres (CFs) has been placed among reinforcement filler candidates with potential, whereas epoxy-based matrices (e.g., thermoplastic polymers) are basically addressed for the manufacturing of composites, meeting a plethora of application target needs, i.e., from automotive to aeronautics, health, and structural/building constructions and processes. Carbon fibre composites reveal increased enhanced mechanical performance, significantly high strength and modulus, increased resistance to creep deformation and stiffness [1,2], to name a few; yet, as fibre-matrix strong chemical bonding is rather scarce, under stress loading [3], the CF composite exhibit decreased mechanical properties, e.g., poor interlaminar shear strength (ILSS) and toughness, as stress propagates from one filament to others, occurring through the matrix resin [3]; pull-out effect occurs, confronted through various approaches of treating the surface in order to incorporate active groups onto fibres surface, resulting in enhancement of CF-matrix. Various surface treatments have been investigated [5,6]; its impact assessment consists of sizing and heat treatment assessment on physicochemical properties as well as electrolysis of anodic oxidation.
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