Tuesday  |  Salon 13  |  05:20 PM–05:40 PM

#15555, The use of Human Surrogate for the Assessment of Ballistic Impacts on the Thorax

This study described the creation of a physical human thorax surrogate dedicated to blunt ballistic impacts called SurHUByx. The geometry of this new surrogate is based on an existing numerical model, named HUByx, which consist in a biofidelic 50th percentile human torso finite element. In order to build the physical dummy, and to choose appropriate material for anatomical structures, able to reproduce correctly the human behaviour, a reverse engineering procedure was applied : material properties of the numerical models (especially the bone structures, as well as internal organs) were simplified in order to match properties of manufacturable materials: Trabecular and cortical bones, as well as costal cartilage were merged, and then modelled with a homogeneous material, whereas internal organs with synthetic gel, which has already proven its biofidelity. This new “simplified” biomechanical model (named SurHUByx) was used to replicate experimental reference cases conducted on Post Mortem Human Subjects. Results were consistent with the biomechanical corridors. The model being validated, the construction of the physical dummy began: Internal organs (heart, lungs, liver and spleen) were molded in 3D printed molds with SEBS gel. Muscle and Mediastinum, were molded with 3D printed molds using various concentrations of SEBS gel. Skin was made with the vinyl skin of the Hybrid III dummy. In the same way as for the numerical validation, the new physical dummy was submitted to the same impact cases of Bir et al. The whole procedure allowed creating a biofidelic dummy with manufacturable materials, which can be used for ballistic accident reconstruction, as it was already performed in the literature in crashworthiness framework.

Martin Chaufer   Interdisciplinary Laboratory Carnot of Bourgogne
Rémi Delille   Univ. Polytechnique Hauts-de-France
Christophe Marechal   Univ. Polytechnique Hauts-de-France
Benjamin Bourel   Univ. Polytechnique Hauts-de-France
Franck Lauro   Univ. Polytechnique Hauts-de-France
Olivier Mauzac   French Ministry of the Interior
Sébastien Roth   Interdisciplinary Laboratory Carnot of Bourgogne