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Article
Open AccessGraphene aerogels as efficient adsorbers of water pollutants and their effect of drying methods
Environmental accidents highlight the need for the development of efficient materials that can be employed to eliminate pollutants including crude oil and its derivatives, as well as toxic organic solvents. In...
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Article
Open AccessHigh surface area g-C3N4 nanosheets as superior solar-light photocatalyst for the degradation of parabens
The rational design and development of highly-active photocatalytic materials for the degradation of dangerous chemical compounds, such as parabens, is one of the main research pillars in the field of photocat...
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Article
Preventing colour fading in artworks with graphene veils
Modern and contemporary art materials are generally prone to irreversible colour changes upon exposure to light and oxidizing agents. Graphene can be produced in thin large sheets, blocks ultraviolet light, an...
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Article
Open AccessCompressive response and buckling of graphene nanoribbons
We examine the mechanical response of single layer graphene nanoribbons (GNR) under constant compressive loads through molecular dynamics simulations. Compressive stress-strain curves are presented for GNRs of...
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Chapter and Conference Paper
Axial Deformation of Monolayer Graphene under Tension and Compression
The mechanical response of single layer graphene is monitored by simultaneous Raman measurements through the shift of either the G or 2D optical phonons, for low levels of tensile and compressive strain. In te...
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Article
Raman spectroscopy investigation of stiffness change and residual strains due to matrix cracking
The matrix cracking models developed for cross-ply composite laminates have been poorly extended in the past to more complex geometries used in practice, and they are still under development. In this paper, a ...
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Article
Effect of Off – Axis Matrix Cracking on Stiffness of Symmetric Angle-Ply Composite Laminates
Matrix cracking models developed for cross-ply composite laminates cannot easily be applied to more complicated geometries. In this paper a detailed analysis of the effect of matrix cracking on the longitudina...
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Chapter and Conference Paper
Raman Spectroscopy Assessment of Stiffness Reduction and Residual Strains due to Matrix Cracking in Angle — Ply Laminates
Off — axis ply cracking in composite laminates and especially its effect on composites thermomechanical behaviour has been extensively studied in the case of cross — ply stacking sequence; see Katerelos and Ga...
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Article
Fluorescence studies of polycrystalline Al2O3 composite constituents: piezo-spectroscopic calibration and applications
Optical fluorescence microscopy (OFM) was used to quantify the effect of applied stress or strain upon the position of the R fluorescence line of αAl2O3 composite constituents (fibers and matrices) prior to compo...
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Article
Stress transfer efficiency in model composites under dynamic loading
The micromechanics of tension–tension fatigue loading in model single-fibre composite geometries is investigated in this paper. In an attempt to emulate the conditions encountered in full carbon fibre composit...
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Chapter
Strain Redistribution in Composite Laminates Resulting from Off-Axis Ply Cracking
The initial mode of damage in multidirectional composites is the accumulation of matrix cracks in the off—axis plies. This kind of damage develops until reaching a so-called saturation point. Several other dam...
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Chapter
In Situ Assessment of the Micromechanics of Large Scale Bridging in Ceramic Composites
The macro- and micro-mechanics of Large Scale Bridging in SiC/MAS-L composites were assessed by means of tensile testing with in situ LRM probing of Double Edge Notch specimens. The macromechanical behaviour w...
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Article
Adaptive composites incorporating shape memory alloy wires Part I Probing the internal stress and temperature distributions with a laser Raman sensor
Hybrid composite laminates consisting of an epoxy resin reinforced by aramid fibres and incorporating SMA wire actuators have been produced. The residual thermal stresses of the composites were determined with...
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Article
Measurement and modeling of stress concentration around a circular notch
When designing composite materials, the presence of stress concentration at locations such as circular nothces is unavoidable. Such locations in structural elements arise from joints required to form a structu...
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Article
On the failure of unidirectional carbon-epoxy composites Part I:The effect of fibre sizing upon filament fracture and damage evolution
It has been demonstrated that – in certain cases – the sizing of carbon fibres can have a dramatic effect upon the mode of failure of unidirectional fibre-reinforced composites. The sizing appears to reduce th...
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Article
Monitoring local strains in cracked cross-ply composites using an embedded aramid fibre strain sensor
Single aramid fibre strain sensors have been embedded in transparent glass-fibre reinforced epoxy resin cross-ply laminates. The sensors, located at the 0°/90°/0° ply interfaces, were interrogated by a remote ...
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Article
Definition and measurement of the shear-lag parameter, β, as an index of the stress transfer efficiency in polymer composites
The shear-lag parameter, β, employed in various problems of shear-lag analysis of composites is an unknown parameter which, in certain cases, is impossible to define. In this paper, a new methodology is propos...
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Article
Finite element modelling of interfacial failure in model carbon fibre-epoxy composites
Finite element analysis has been used to model a single unsized carbon fibre embedded in an epoxy matrix subjected to tensile loading. The predicted fibre strain distribution is compared with experimental data...
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Article
Characterization of PAN-based carbon fibres with laser Raman spectroscopy
Laser Raman spectroscopy (LRS) has been employed to characterize the structure and morphology of a series of carbon fibres, to assess the combined effects of ultimate firing temperature (UFT) and pre-graphitiz...
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Article
Compressional behaviour of carbon fibres
Spectroscopic-mechanical studies have been conducted on a range of carbon fibres by bonding single filaments on the top surface of a cantilever beam. Such a loading configuration allows the acquisition of the ...
