Liu, KaiXu, ZongYingDetwiler, DuaneTovar, Andres2019-01-092019-01-092016-04Liu, K., Xu, Z., Detwiler, D., & Tovar, A. (2016). Optimal Design of Cellular Material Systems for Crashworthiness. Presented at the SAE 2016 World Congress and Exhibition. https://doi.org/10.4271/2016-01-1396https://hdl.handle.net/1805/18106This work proposes a new method to design crashworthiness structures that made of functionally graded cellular (porous) material. The proposed method consists of three stages: The first stage is to generate a conceptual design using a topology optimization algorithm so that a variable density is distributed within the structure minimizing its compliance. The second stage is to cluster the variable density using a machine-learning algorithm to reduce the dimension of the design space. The third stage is to maximize structural crashworthiness indicators (e.g., internal energy absorption) and minimize mass using a metamodel-based multi-objective genetic algorithm. The final structure is synthesized by optimally selecting cellular material phases from a predefined material library. In this work, the Hashin-Shtrikman bounds are derived for the two-phase cellular material, and the structure performances are compared to the optimized structures derived by our proposed framework. In comparison to traditional structures that made of a single cellular phase, the results demonstrate the improved performance when multiple cellular phases are used.enPublisher Policycrashworthinesscellular materialmultiple cellular phasesConference proceedings