Rory Spencer Lloyd Fletcher Mike Gorley Cory Hamelin Allan Harte
Constitutive behaviour of fusion-relevant steels in the post-necking regime is necessary for detailed design of future fusion device components. A Finite Element Model Updating (FEMU) procedure using Digital Image Correlation (DIC), a simulated DIC filter and novel constitutive law was developed. The effects of the DIC process and experimental nois…
PreprintA. Matejunas L. Fletcher L. Lamberson
Due to the strong rate dependence in their mechanical response, polymers find widespread use in applications subject to impact loading. However, characterizing these materials on microsecond time scales has proven challenging. Traditional experimental techniques rely on satisfying a number of limiting assumptions and typically do not provide direct…
PreprintE. J. Muttio W. G. Dettmera J. Clarke D. Peric Z. Ren L. Fletcher
A Supervised Parallel Optimisation (SPO) is presented. The proposed framework couples different optimisation algorithms to solve single-objective optimisation problems. The supervision balances the exploration and exploitation capabilities of the distinct optimisers included, providing a general framework to solve problems with diverse character…
PreprintK. G. McClements L. Fletcher
The possibility that electrons could be accelerated by inertial Alfvén waves to hard X-ray-emitting energies in the low solar corona during flares is investigated theoretically. This investigation is prompted in part by recent microwave observations indicating that the coronal magnetic field is strong enough that the Alfvén velocity c A above act…
PublishedR. J. Mckay K. G. McClements A. Thyagaraja L. Fletcher Euratom/Ukaea
A full orbit test-particle approach is used to study the collisional transport of impurity (carbon) ions in spherical tokamak (ST) plasmas with transonic and subsonic toroidal flows. The efficacy of this approach is demonstrated by reproducing the results of classical transport theory in the large aspect ratio limit. The equilibrium parameters used…
Published