Professor Cris Arnold
Professor
Engineering
Telephone: (01792) 295749
Room: Deputy Head of College - A_104
First Floor
Engineering Central
Bay Campus

My main research focus is on the long-term lifetime behaviour of polymers and polymer based composites. Most of this research is industrially-linked with companies including Airbus, Tata, Fiberweb, Rolls Royce and TWI. Projects are funded by EPSRC, ERDF, Welsh Government and Industry, amounting to over £1million in the last four years.

Specific research projects include:

Modelling of the effects of water ingress into carbon-fibre / epoxy composites
The effects of graphene-nanoparticle reinforcement on thermoplastic performance
Outdoor lifetime prediction of polymer-coated steels
Weathering of polymers and biopolymers used for tree shelters
The effects of impact damage and repair methods for carbon-fibre composites
In addition, I also have a research activity in the environmental impact assessment of polymer-based materials through their lifetime, including the effects of recycling and biopolymers.

Through my involvement with the Welsh Composites Centre, the Astute project and the ATM scheme, I undertake significant smaller-scale collaborative R&D projects with companies across the local region.

Publications

  1. Al-Salem, S., Behbehani, M., Al-Hazza’a, A., Arnold, J., Alston, S., Al-Rowaih, A., Asiri, F., Al-Rowaih, S., Karam, H., Arnold, C., Alston, S. Study of the degradation profile for virgin linear low-density polyethylene (LLDPE) and polyolefin (PO) plastic waste blends Journal of Material Cycles and Waste Management
  2. Arnold, J., Arnold, C. Environmental Effects on Crack Growth in Composites (Ed.), Comprehensive Structural Integrity 470
  3. Korkees, F., Arnold, C., Alston, S. Water absorption and low-energy impact and their role in the failure of ±45° carbon fibre composites Polymer Composites
  4. Huszar, M., Belblidia, F., Arnold, J., Bould, D., Sienz, H., Arnold, C. An exploration of core misalignment, shifting and deflection phenomena through thickness measurements on thin-walled injection moulded bins Sustainable Design and Manufacturing (SDM) Conference, Cardiff 28-30 April, 2014.
  5. Alexander, R., Arnold, J., Alston, S., Searle, J., Arnold, C. Thermal Analysis as a Tool for Assessing the Degradation of PVC-coated Constructional Steel. International Conference & Exhibition on Advanced & Nano Materials. Calgary, Canada.

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Teaching

  • EG-108 Engineering Sustainability

    .

  • EG-188 Engineering Analysis for Materials 2

    To provide additional grounding in engineering analysis methods for materials students. The module will cover the most important analytical tools and methods used in engineering and will relate these to common materials-related examples. The module will ensure the required grounding in methods and techniques for those who have not previously covered this area, or who are returning after a gap. It will also provide opportunities for extension to more complicated examples for those who have more prior experience.

  • EG-294 Airframe Structures

    This module covers the fundamentals of linear elasticity and the stress analysis of the thin-walled structural components which are commonly employed in the design of modern wings and fuselages. In particular, the bending, shearing and twisting of thin-walled beams with open, closed or multi-cell cross-sections is studied in detail. The stiffening effect of stringers is investigated and end constraints are discussed. Numerous examples demonstrate the application of the theory. The module teaches the analytical skills, but also develops the students' feeling for thin-walled structures.

  • EG-385 Polymers: Properties and Design

    ¿ Mechanical properties and design with rubber. ¿ General mechanical properties of polymers; viscoelasticity, time and temperature dependence, creep, recovery and stress relaxation. ¿ Design using deformation data; creep curves, pseudo-elastic design methodology, time and temperature dependant modulus, limiting strain. ¿ Mathematical modelling of viscoelasticity; equations for creep, recovery, relaxation, Maxwell and Voigt models, 4-element model, standard linear solid model. ¿ Boltzmann superposition principle and its use with complex stress histories. ¿ Strength and fracture of polymers; energy approach, toughness, ductile / brittle transitions, yield strength, ductility factor. ¿ Creep failure of plastics; fracture mechanics approach, fatigue failure, effects of cycle frequency, waveform, fracture mechanics approach to fatigue.

  • EG-M108 Advanced Polymers & Composites

    The module will provide a deeper understanding of the technology of plastics & composites materials and processing. The material covered will cross cut the engineering disciplines of advanced manufacturing technology and polymer science to broaden the technical and industrial context of polymer and composite processing. Within the content of the module simulation software will be applied to industrial case study examples for critical evaluation. In addition, the module will also introduce micro injection moulding, composite layups and 3-D printing.

  • EGH100 Work Based Learning

    This work-based module will be undertaken in the spring / summer period within the student¿s employing company. It will involve flexible learning designed to extend and reinforce the material covered in other modules. It will be directed and supported by both industrial and academic supervisor. The areas to be encompassed within the case studies will include health and safety management, quality and manufacturing management, design and material selection.

  • EGH100A Work Based Learning

    This work-based module will be undertaken in the spring / summer period within the student¿s employing company. It will involve flexible learning designed to extend and reinforce the material covered in other modules. It will be directed and supported by both industrial and academic supervisor. The areas to be encompassed within the case studies will include health and safety management, quality and manufacturing management, design and material selection.

  • EGH309 Advanced Materials

    This module will cover the detailed mechanical behaviour of both metallic alloys and fibre composites. It will start with a recap of tensile failure mechanisms, but extend to compression and shear failures. Fracture mechanics will then be introduced as applied to metallic materials and be extended to damage accumulation methods for composite materials. Creep, fatigue and impact will be covered as will the effects of elevated temperature and external environmental conditions.

  • EGTM89 Polymers: Properties and Design

    To instil an understanding of design methods with polymeric materials, dealing especially with viscoelastic behaviour.

Supervision

  • Enhancing the Barrier Properties of Polymeric Materials by Incorporating Nano-Particles (current)

    Student name:
    PhD
    Other supervisor: Dr Feras Korkees
  • Rapid prototyping and tooling of automotive seal mouldings (current)

    Student name:
    MSc
    Other supervisor: Dr Andrew Rees
  • Development of Novel Thin-ply Technology for Carbon Fibre Composite Materials (current)

    Student name:
    EngD
    Other supervisor: Prof David Penney
  • Degradation Mechanisms on novel organic coated steel products (current)

    Student name:
    EngD
    Other supervisor: Dr Matthew Carnie
  • Optimising Mobility Behaviour Of Polymer Coated Packaging Steel, Protact (Understanding, measure, improve). (current)

    Student name:
    EngD
    Other supervisor: Dr David Warren
  • Formability of polymer coated metals (current)

    Student name:
    EngD
    Other supervisor: Dr Will Harrison
  • Evaluation and Reduction of Stress Whitening and Associated Mechnisms in Polyester-Melamine and Polyurethane Pre-Coated Metal Systems (awarded 2020)

    Student name:
    EngD
    Other supervisor: Prof David Gethin
  • 'The characterisation of degradation in PVC-coated steels and the development of novel methods of detection' (awarded 2018)

    Student name:
    EngD
    Other supervisor: Prof David Worsley
  • '''''''Experimental investigations into the behaviour of composite aircraft wing repairs''''''' (awarded 2018)

    Student name:
    EngD
    Other supervisor: Prof Johann Sienz