Finite element modelling of anthropomorphic test devices for vehicle crashworthiness evaluation

This research focuses on the development and implementation of a methodolog y for creating highly accurate occupant finite element models. This study c oncentrates on a 50(th) Percentile Anthropomorphic crash Test Dummy (ATD) F inite Element (FE) model with application in vehicle crashworthiness evalua tion. An extensive review of currently available FEM models of the Hybrid I II 50(th) percentile dummy revealed the need for a more extensive model of ATD's. Currently available models contain upwards of 20,000 elements but do not include each component's full geometry. This research has spawned a mo del that is composed of 45,000 elements, and includes all parts of an actua l Hybrid III ATD in acute detail. A method for creating dummy finite elemen t models is presented. This methodology is based on the premise that the mo del must be based on the fundamentals of mechanics, focusing directly on co mponent geometry and material mechanical properties. Furthermore, the model should be created and validated at the component level and then integrated and re-evaluated at a system level to ensure accuracy. All parts of an exi sting Hybrid III ATD are incorporated in their original manufacturer intend ed form and function. This paper will focus on the method, which has been developed and employed to create a Hybrid III ATD finite element model. Discussion of the relevant issues and pitfalls in modeling an occupant for use in impact simulation w ill be highlighted. This modeling was done with several fundamentals in min d: First the resulting FEM must accurately represent an actual ATD in mass, inertia, and material properties. Secondly, special attention must be paid to the need for this model to be integrated into existing and future model s of vehicle occupant compartments. Finally, the methodology must be logica l and easy to follow in order to reduce error in implementation.