Improved Biofidelity of Child Crash Dummy Thorax Finite Element Model

Ibrahim Abdullahi Rafukka

Abstract


Crash dummies are measuring devices applied in the safety certification of vehicles. They are used to imitate human responses in crashes. Bio fidelity is the main requirement of dummies. Current Three-Year-Old (3YO) chid crash dummies are validated using scaled adult data due to the paucity of child volunteers and cadaver data. Hence there is a need to validate their response against at least age mate cadaver response. This work modified the viscoelastic material properties of 3YO Finite Element (FE) child dummy thorax flesh and bib assembly and compared its response with two 3YO cadaver response data obtained from literature, to improve its bio fidelity. A 6 m/s thorax impact test was conducted using FE simulation according to the National Highway Traffic Safety Administration (NHTSA) 3YO Hybrid III (HIII) certification. It was found that adjusting the viscoelastic parameters: bulk modulus, K, long-term shear modulus, G1, short-term shear modulus, Go for thorax flesh and elastic modulus, E for bib assembly change the dummy response to that of a cadaver with a difference of 10.4% and 17.5% for peak force and chest deflection respectively. Chest deflection-time history fits very well in the 3YO certification corridors. The biofidelic dummy will measure injury response more realistically than the HIII dummy models.


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References


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