Hayes, Simon A - University of Sheffield - Department of Materials Science and Engineering

个人简介

His research interests primarily concern the development of `SMART´ systems for health monitoring and mitigation in composite materials. He also has an interest in the nanomechanical testing of polymeric and other viscoelastic materials. Health monitoring of composites is important for their widespread use in safety-critical applications, such as aerospace structures. One focus of the research is therefore the implementation of sensors which provide large area coverage without imposing excessive parasitic weight. The development of sensors based on a philosophy of low cost but high sensitivity is a focus of his research. This has led to the development of resistance-based and optical systems, which employ the reinforcing fibre as the sensing element, that are capable of damage location and quantification. He had also developed optical sensor systems using custom drawn chalcogenide glass fibres and is investigating the use of H-glass. A second focus of his research in smart materials is that of damage mitigation. Once damage is identified a response must be initiated, in this case some form of integral self-healing technology is desirable. One such system is the thermoplastic self-healing system developed by Dr Hayes and colleagues the employs a thermoplastic dissolved in a thermosetting resin system, which can be induced to heal when heated. He is also working on alternative methods of healing involving the development of supramolecular polymer systems. A recent development related to the resistance-based self-sensing system is the use of reinforcing fibres as heating elements to cure the composite itself. To date, work has shown that direct application of an electric current to a carbon-fibre composite can induce cure, with similar energy requirements to an incandescent bulb, a substantial reduction in the energy requirements compared to conventional processing routes. A further research interest is in the nanomechanical testing of viscoelastic materials. Nanoindentation, as a technique for determining the mechanical properties of small volumes of material, was primarily developed on hard elastic coatings. It is therefore difficult to apply the technique to viscoelastic materials. Dr Hayes has developed techniques that enable measurements using nanoindentation to be directly compared with those obtained from macromechanical tests on bulk polymers for both bulk polymers and polymer coatings.

研究领域

Simon Hayes was appointed in January 2000 as a lecturer in materials science associated with the faculty wide Aerospace Engineering degree programme. He joined Sheffield University in 1997 as a Research Associate after obtaining a PhD from Brunel University on optical fibre sensors for damage assessment in composite materials.

近期论文

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A practical structural health monitoring system for carbon fibre reinforced composite based on electrical resistance. Swait, TJ; Jones FR; Hayes, SA. Composites Science and Technology 72 (13) 1515-1523 (2012). Smart composite materials for self-sensing and self-healing. Swait, TJ; Rauf, A; Grainger, R; Bailey, PBS; Lafferty, AD; Fleet, EJ; Hand, RJ; Hayes, SA. Plastics Rubber and Composites 41 (4-5) 215-224 (2012). Characterisation of thermo-mechanical properties of MgO-Al2O3-SiO2 glass ceramic with different heat treatment temperatures. Shamsudin, Z; Hodzic, A; Soutis, C; Hand, RJ; Hayes, SA; Bond, IP. Journal of Materials Science 46 (17) 5822-5829 (2011) Calibrating a nanoindenter for very shallow depth indentation using equivalent contact radius. Tadjiev, DR; Hand, RJ; Hayes, SA. Philosophical Magazine 90 (13) 1819-1832 (2010). Chemical Monitoring of Composite Matrices by Evanescent Wave Spectroscopy. Bailey, PBS; Hayes, SA; Hand, RJ; et al. Emboding Intelligence in Structures and Integrated Systems 56 297-302 (2009