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Edmund Tarleton

Dr Edmund Tarleton CEng, MIMMM
EPSRC Fellow in Dislocation Modelling

Department of Materials
University of Oxford
16 Parks Road
Oxford OX1 3PH
UK

Tel: +44 1865 273768 (Room 110.15.04)
Tel: +44 1865 273777 (reception)
Fax: +44 1865 273789 (general fax)

Defect Dynamics Group
MFFP Group

Summary of Interests

-Dislocation dynamics

-Finite element method

-Crystal plasticity

Current Research Projects

Brittle-ductile transitions in BCC metals for fusion power applications
Dr D.E.J. Armstrong, Dr. E. Tarleton, Professor S.G. Roberts, Dr. A.J. Wilkinson, Professor S.L. Dudarev*
The project investigates the brittle-to-ductile transition in tungsten and iron-chromium alloys up to 12%Cr (all these metals are the basis for proposed fusion power plant alloys). Pre-cracked miniature bend specimens of single crystals and polycrystalline materials are fracture tested in the temperature range 77 - 450K. The effect of dislocation motion around the crack tips on fracture stress is examined, and modelled using dynamic-dislocation simulations. Funded by EPSRC and CCFE. (*EURATOM/CCFE)

1 public active projects

Research Publications

My recent publications are available here

 

 

 

Projects Available

Dislocation based modelling of engineering alloys
E Tarleton and Prof A J Wilkinson

You will be part of a small dynamic team developing state of the art computational models which are used to simulate a range of micro mechanical tests and microscopy data. This project focuses on simulating delayed hydride cracking in Zr alloys as used in compact nuclear reactors for submarine propulsion. You will simulate the coupled mechanical/hydrogen diffusion process within a discrete dislocation plasticity framework. This will involve developing a FEM code to solve the H diffusion equation, and coupling this with a discrete dislocation plasticity code to simulate dislocation-hydrogen interactions. The majority of the coding will be in Matlab, with the opportunity to learn and use C and CUDA to accelerate the code.

The project will link to experimental work within the wider Materials for Fusion and Fission Power group and may involve interaction with Rolls Royce (Marine).

 

Also see homepages: Edmund Tarleton Angus Wilkinson

Understanding High Temperature Small Scale Mechanical Performance of Materials for Nuclear Fusion
Dr D.E.J. Armstrong, Dr E. Tarleton, Professor A.J. Wilkinson,

Future nuclear power systems, both fission and fusion, rely on the development of materials which can withstand some of the most extreme engineering environments. These include temperatures up to 1500oC, high fluxes of high energy neutrons and effects of gaseous elements produced by transmutation and implantation from the plasmas. Due to efforts to minimise the production of nuclear waste by such reactors the elements which may be used in structural components is limited and in many cases there is a lack of understanding of the basic deformation processes occur in ether pure materials or alloys and importantly how these are affected by temperature, radiation damage and gas content. This project will build upon the expertise in the MFFP and Micromechanics groups on high temperature mechanical testing at the micro and nano-scale. Facilities include two high temperature nanoindenters (-50oC to 950oC), high temperature microhardness (RT to 1500oC) and dedicated FIB-SEM and FEG-SEM with EBSD as well as state of the art computer codes for strain gradient crystal plasticity finite element modelling and discrete dislocation plasticity modelling. Both nanoindentation, micro-compression and micro-bend experiments will be used to study plastic deformation, fracture and creep in a range of novel high temperature materials (likely Fe, SiC or Zr based) with potential for use in future fusion reactors. HR-EBSD and AFM will be used to study deformation structures produced during testing and to inform strain gradient crystal plasticity finite element and discrete dislocation models. This will allow for a fuller understanding of the underlying physics of deformation in these materials both before and after irradiation or gas implantation. Strong links will be made to activities within the Science and Technology of Fusion Energy (EPSRC Centre for Doctoral Training) and the Culham Centre for Fusion Energy.

Also see homepages: David Armstrong Edmund Tarleton Angus Wilkinson

Also see a full listing of New projects available within the Department of Materials.