Song 1 PELVIS BONE FRACTURE MODELING IN LATERAL IMPACT

This paper presents personalized simulations of eleven isolated pelvic bones under lateral impact and a generic 50 percentile male pelvic bone model based on these simulations. Eleven pelvises were solicited by metallic spheres in the acetabulum, which were impacted by a falling mass of 3.68 kg at a speed of 4 m/s. Each pelvis test was then modeled individually, taking into account its proper geometry and mass. Damageable material law was used to simulate the bone stiffness and fracture. For each pelvis test were determined equivalent elastic modulus, yielding stress and damage plastic strain representing combined contributions of material properties and cortical bone thickness to pelvis bone resistance. Based on these personalized simulations a generic 50 percentile male pelvic bone model was defined and integrated into a full body model to simulate cadaver tests on pelvis where bone fractures were documented. Three material laws were then identified and associated with this model, representing respectively a fragile, a medium and a resistant pelvis bone. The mechanical behavior of this pelvis model was also compared to experimental data on cadavers. It showed that the pelvis model developed is globally relevant with respect to experiments in terms of pelvis loading prediction, this for a large range of impact energy from 130 to 1150 Joules. This paper provides new data and insights for pelvis bone fracture modeling in lateral impact. The resulted model is consistent with available impactor test data on pelvis and constitutes a useful tool for lateral impact injury research.