Reliable lightweight design of cast components in trains and trucks
Many industries are reliant on cast iron structures which are subjected to repeated fatigue loadings. While topology optimisation is increasingly used to reduce the weight of these components, the integration of fatigue considerations and casting constraints in the optimisation process remains heavily reliant on the experience of the designer. The project aims to address this issue by developing an initial methodology for lightweight design optimisation of cast components that integrates fatigue life and casting constraints at an early stage in the design process.
Project Contribution to the LIGHTer Program Goals
The project intends to exploit the similarities in the requirements and constraints for large castings used in rail and road vehicles. There are clear environmental benefits in reducing the weight of such vehicles and the proposed development of design guidelines effectively bridges the gap between industry and academia. New and innovative materials will be utilised and the possibilities of bi-metallic casting explored. The development of a clear methodology for lightweight design optimisation will help to lower design costs and shorten development times.
The project is led by Bombardier Transportation AB in partnership with Ausferritic AB, Scania CV AB and KTH Department of Solid Mechanics. After initial development, the methodology will be tested by assessing the fatigue life of a prototype railway motor housing to confirm that the design requirements are met. The developed methodology will also be used for educational purposes in an advanced design course at KTH. Furthermore, the pre-project aims to investigate the possibility of achieving further weight reductions using the ausferritic ductile iron materials developed by Ausferritic AB, which offer excellent castability combined with very high strength, ductility and fracture toughness.
Bombardier Transportation AB
Scania CV AB
Kungliga Tekniska Högskolan (KTH) Institutionen för Hållfasthetslära
Projektet delfinansieras av Vinnova.