Design for crashworthiness of vehicle structures with minimum peak crushing force and penetration using an extended hybrid cellular automaton method 2019-01-0842
This paper introduces a methodology to tailor the acceleration and displacement responses of a vehicle structure subjected to a dynamic crushing load. The proposed approach is an extension of the hybrid cellular automaton (HCA) method, through which the internal energy density is uniformly distributed within the structure. The proposed approach, referred here to as an extended HCA (xHCA), finds the suitable combinations of volume fraction and meta-parameters for which the algorithm synthesizes the load paths that allow the desired crash response. While the effect of the volume fraction in the crash response is generally known, this work demonstrates the relevance of other meta-parameters associated with finite element simulations. Small values of meta-parameters lead to design obtained by linear optimizers, while large values of meta-parameters lead to designs obtained by the traditional HCA method. The application of intermediate values of meta-parameters presented here shown to be appropriate to tailor the response of the structure and achieve the variety of acceleration and displacement responses. Numerical examples of side impact and frontal impact on vehicle components are utilized to illustrate the capabilities of the proposed xHCA method.
Sajjad Raeisi, Prasad Tapkir, Andres Tovar, Chandan Mozumder, Simon Xu
Purdue University, Indiana University; Purdue University, General Motors