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Mo F.,Ifsttar University Of La Mediterranee | Arnoux P.J.,Ifsttar University Of La Mediterranee | Jure J.J.,University Claude Bernard Lyon 1 | Masson C.,Ifsttar University Of La Mediterranee
Accident Analysis and Prevention | Year: 2012

Lower limbs are normally the first contacted body region during car-pedestrian accidents, and easily suffer serious injuries. The previous tibia bending tolerances for pedestrian safety were mainly developed from three-point bending tests on tibia mid-shaft. The tibia tolerances of other locations are still not investigated enough. In addition, tibia loading condition under the car-pedestrian impact should be explored to compare with the three-point bending. This work aims to investigate the injury tolerance of tibia fracture with combined experimental data and numerical simulation. Eleven new reported quasistatic bending tests of tibia mid-shaft, and additional eleven dynamic mid-shaft bending test results in the previous literature were used to define injury risk functions. Furthermore, to investigate the influence of tibia locations on bending tolerance, finite element simulations with lower limb model were implemented according to three-point bending and pedestrian impact conditions. The regressive curve of tibia bending tolerance was obtained from the simulations on the different impact locations, and indicated that tibia fracture tolerance could vary largely due to the impact locations for the car-pedestrian crash. © 2011 Elsevier Ltd. All rights reserved.

Conte C.,Ifsttar University Of La Mediterranee | Masson C.,Ifsttar University Of La Mediterranee | Arnoux P.-J.,Ifsttar University Of La Mediterranee
Computer Methods in Biomechanics and Biomedical Engineering | Year: 2012

To prevent traumas to abdominal organs, the selection of efficient safety devices should be based on a detailed knowledge of injury mechanisms and related injury criteria. In this sense, finite element (FE) simulation coupled with experiment could be a valuable tool to provide a better understanding of the behaviour of internal organs under crash conditions. This work proposes a methodology based on inverse analysis which combines exploration process optimisation and robustness study to obtain mechanical behaviour of the complex structure of the liver through FE simulation. The liver characterisation was based on Mooney-Rivlin hyperelastic behaviour law considering whole liver structure under uniform quasi-static compression. With the global method used, the model fits experimental data. The variability induced by modelling parameters is quantified within a reasonable time. © 2012 Copyright Taylor and Francis Group, LLC.

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