Enhancements in analysis of beam-like structures using asymptotic methods
Author(s)
Gupta, Mohit
Advisor(s)
Hodges, Dewey H.
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Abstract
As a complement to conventional FEA, state-of-the-art Variational Asymptotic Method (VAM) and a mixed formulation of Geometrically Exact Beam Theory (GEBT) are employed in this work, which is very fast, provides rigorous physics-based material models for composites while ensuring efficiency and accuracy. In the present work, some major issues with use of VAM-based framework for solving thin-walled structures have been identified and fixed, whose solution involved a theoretical modification in the existing VAM-based framework. Further, the overall framework has been facilitated with analysis of piezoelectric materials, analysis involving structural damping and a method to obtain, store and visualize time-histories of 3D stresses, strains and displacements. Finally, a method to use dimensional reduction techniques for solving beam-like structures, such as aircraft wings, involving complex and intricate 3-D geometries is demonstrated. Thus, the present work enhances the analysis of beams using asymptotic methods, expands the scope of VAM-based beam theory and provides extensive validation for implemented techniques with the commercially available 3-D FEM tools.
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Date
2019-04-01
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Resource Type
Text
Resource Subtype
Dissertation