Abstract
During the casting process and solidification of ductile iron castings, a heterogeneous microstructure is formed throughout the casting. This distribution is strongly influenced by the item geometry and the process related factors, as chemical composition and local solidification conditions. Geometrical changes to the geometry of the casting thus alters the local mechanical behavior and properties, as well as the distribution of stresses and strains when the casting is subjected to load. In order to find an optimal geometry, e.g. with reduced weight and increased load-bearing capacity, this interdependency between geometry and local material behavior needs to be considered and integrated into the optimization method.
In this contribution, recent developments in the multidisciplinary integration of casting process simulation, solidification and microstructure modelling, microstructure-based material characterization, Finite Element Analyses (FEA) with local material behavior and structural optimization techniques are presented and discussed. The effect and relevance of considering the local material behavior in shape optimization of ductile iron castings is discussed and evidenced by an industrial application. It is shown that by adopting a multidisciplinary optimization approach by integration of casting simulation and local material behavior into shape optimization, the potential of the casting process to obtain components with high performance and reliability can be enabled and utilized.
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References
Ceschini, L., Morri, A., Morri, A., Salsi, E., Squatrito, R., et al.: Microstructure and mechanical properties of heavy section ductile iron castings: Experimental and numerical evaluation of effects of cooling rates. Int. J. Cast Met. Res. 28, 365–374 (2015)
Olofsson, J., Svensson, I.L.: The effects of local variations in mechanical behaviour – Numerical investigation of a ductile iron component. Mater. Des. 43, 264–271 (2013)
Shirani, M., Härkegård, G.: A review on fatigue design of heavy section EN-GJS-400-18-LT ductile iron wind turbine castings. Energy Equipment Syst. 2, 5–24 (2014)
Kavicka, F., Dobrovska, J., Stransky, K., et al.: The investigation of cooling of a massive casting of ductile cast iron. In: CD ICCE-18 Eighteenth Annual International Conference on Composites/Nano Engineering, Anchorage, Alaska, USA (2010)
Wessén, M., Svensson, I.: Modeling of ferrite growth in nodular cast iron. Metall. Mater. Trans. A 27, 2209–2220 (1996)
Donelan, P.: Modelling microstructural and mechanical properties of ferritic ductile cast iron. Mater. Sci. Technol. 16, 261–269 (2000)
Lewis, R.W., Manzari, M.T., Gethin, D.T.: Thermal optimisation in the sand casting process. Eng. Comput. 18, 392–417 (2001)
Morthland, T.E., Byrne, P.E., Tortorelli, D.A., Dantzig, J.A.: Optimal riser design for metal castings. Metall. Mater. Trans. B 26, 871–885 (1995)
Kainzinger, P., Grün, F.: Optimization based on local material properties. In: FEMFat User Meeting, Steyr, Austria, 15–17 May 2013
Cenni, R., Cova, M., Bertuzzi, G.: A methodology to consider local material properties in structural optimization. In: Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science (2016)
Olofsson, J., Svensson, I.L.: Incorporating predicted local mechanical behaviour of cast components into finite element simulations. Mater. Des. 34, 494–500 (2012)
Olofsson, J., Salomonsson, K., Johansson, J., Amouzgar, K.: A methodology for microstructure-based structural optimization of cast and injection moulded parts using knowledge-based design automation. Adv. Eng. Softw. 109, 44–52 (2017)
Bertuzzi, G., Cova, M., Cenni, R., Scarpa, G., Lago, F.: Structural optimization of heavy section ductile iron components: how the integration and optimization of casting process can improve their design. In: ICC2016, Parma, Italy (2016)
Olofsson, J., Salomonsson, K., Svensson, I.L.: Modelling and simulations of ductile iron solidification-induced variations in mechanical behaviour on component and microstructural level. In: MCWASP XIV 84, 12026 (2015)
Thomser, C., Bodenburg, M., Sturm, J.C.: Optimized durability prediction of cast iron based on local microstructure. Int. J. Metalcast. 11, 207–215 (2017)
Hahn, I., Sturm, J.C.: Autonomous optimization of casting processes and designs. In: 69th World Foundry Congress WFC, Hangzhou, China (2010)
Acknowledgements
The Swedish authors acknowledge Region Jönköping County and Jönköping University for financing the ODISSEE-project, Optimal Design using Integrated Simulation based engineering, which has enabled the current work. Part of the work has also been enabled through the research profile CompCAST, for which the Swedish Knowledge Foundation is acknowledged for financial support.
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Olofsson, J., Cenni, R., Cova, M., Bertuzzi, G., Salomonsson, K., Johansson, J. (2018). Multidisciplinary Shape Optimization of Ductile Iron Castings by Considering Local Microstructure and Material Behaviour. In: Schumacher, A., Vietor, T., Fiebig, S., Bletzinger, KU., Maute, K. (eds) Advances in Structural and Multidisciplinary Optimization. WCSMO 2017. Springer, Cham. https://doi.org/10.1007/978-3-319-67988-4_135
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DOI: https://doi.org/10.1007/978-3-319-67988-4_135
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