Nimrod: a tool for performing parametrised simulations using distributed workstations
HPDC '95 Proceedings of the 4th IEEE International Symposium on High Performance Distributed Computing
EC'08 Proceedings of the 9th WSEAS International Conference on Evolutionary Computing
MACMESE'07 Proceedings of the 9th WSEAS international conference on Mathematical and computational methods in science and engineering
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The structural optimisation procedure proposed integrates 3D geometrical modelling, structural analysis and optimization into one complete and automated computer-aided design process. This approach includes the implementation of the generalised Frost-Dugdale model, in which recent observation has revealed a near log-linear relationship between natural log of the crack length and the fatigue life for crack growth lengths as small as a few microns. Consequently, design against fatigue failure can include the analysis of near-threshold crack propagation, i.e. growth in the low-to-mid stress intensity factor range. The research presented here uses the generalised Frost-Dugdale model in a 3D numerical fatigue based optimisation study of a 7050-T7451 Aluminium structure. Two types of optimisation techniques were considered for this investigation; a gradient-less based and an enumeration scheme. The enumeration scheme takes advantage of a cluster computer architecture to produce a solution space. As a result, this procedure illustrates that for the design of light weight structures, a fatigue based optimisation used in conjunction with visualisation of the solution space may provide a viable design methodology. Furthermore, the possibility of the application of the Generalised Frost-Dugdale model in design optimisation has been demonstrated. This procedure has the potential to be applied to structures with complex structural configurations taking into account crack propagation in the near-threshold region.