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Title: Topology, shape and sizing optimization of plate structures
Author: Bin Mohamed Taib, I.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2000
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This thesis deals with structural topology, shape and sizing optimization of plate structures which are the necessary building blocks of a fully integrated design optimization (FIDO) system. The thesis is restricted to plates subjected to lateral loading which are modelled using Mindlin-Reissner (MR) assumptions and to a lesser extent plates subjected to in-plane loading modelled using plane stress assumptions. Stiffened plates with MR plate and Timoshenko beam models used to represent the combined system are briefly considered. In this thesis, for Fe analysis, the 9-node MR plate elements and the 8-node plane stress elements are generally used for the plate structures. However for structural shape optimization (SSO), 6-noded triangular plane stress elements are used. In the FE idealization of the stiffened plates, 9-node plate element and the 3-node Timoshenko beam stiffener elements are employed. Three layered model and single layered plate models of the plate are adopted for topology optimization which is carried out using the evolutionary hard-kill method. The topologies so obtained are compared with the topologies obtained using the homogenization method with artificial materials. Having obtained an optimal plate topology, which is usually presented in the form of a greyscales density plot, it is now necessary to extract a usable structural design. This is achieved by structural model redefinition. First, a combined thresholding and spline fitting algorithm based on a least squares method is used to redefine the boundaries of structural topology image. If further shape or sizing optimization is required, parameterization is then carried out. Next the shape of the plate boundaries may be optimized using shape optimization procedures. Topology optimization, structural model redefinition and a parameterization and shape optimization are then integrated into a FIDO system for plate structures.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available