Optimal Topologies of Extrusion Cross-sections for Crashworthiness

Topology optimization for crashworthiness is still a challenging task due to dynamic effects and high nonlinearities. In this paper, a new approach is presented based on hybrid cellular automata, which enables optimization using nonlinear and dynamic crash modeling and simulations. A special ground structure approach is used where the cells for the cellular automata are structural entities consisting of a larger set of finite elements and not a single element (voxel) like in approaches available until now. Due to the usage of shell elements, it is possible to realize topology optimizations for thin-walled structures allowing buckling and local folding with plastic hinge line generation and collapse mechanisms typical for metal structures. The potential of this method is illustrated for cross-sectional optimization of extrusion beams under axial and transverse impact loads.      «

Topology optimization for crashworthiness is still a challenging task due to dynamic effects and high nonlinearities. In this paper, a new approach is presented based on hybrid cellular automata, which enables optimization using nonlinear and dynamic crash modeling and simulations. A special ground structure approach is used where the cells for the cellular automata are structural entities consisting of a larger set of finite elements and not a single element (voxel) like in approaches available...     »