Topology optimization of vehicle body structures : method, theory and applications

Abstract: This dissertation is concerned with topology optimization of vehicle body structures.The first part of this thesis gives a summary of the research project. A design process for complex mechanical structures is presented. This design process includes an optimization step where simplified models are optimized. These simplified models are frame structures consisting of beams and joints. Joints are modelled as a collection of sub-elements to support for a topological change during optimization. Parameterization of beams and joint is also presented and design variables are introduced.An application of this frame topology optimization method, concerning a vehicle body structure, is presented.Two extensions to the theory are also presented. First, the possibility to penalize joints to support for easily realizable results is presented. This is followed by a two-material interpolation that introduces the possibility of using a mixed material structure.This introductory part is followed by five appended papers produced within the framework of this research.