Abstract

This study proposes a systematic computer simulation technique, using strain as a criterion to assess the severity of brain damage under rotational loading, in particular diffuse axonal injury (DAI). A plane strain model representing realistically a section of the brain in the frontal plane (coronal section) is used in this investigation. The Brain-Skull interface has been modelled using a new representation, allowing the brain to move in a true bio-fidelic way, as well as taking into account the damping role of the Cerebrospinal Fluid (CSF), which acts as a buoy forming a protective cushion around the brain. Based on accident reconstruction data from the literature, the model is validated against the injury observed on the victims. Furthermore, this study proposes a parametric study of brain material properties to assess their effect on the brains’ dynamic response and suggests a new injury criterion for the DAI. It appears that the need to develop a comprehensive head injury criterion (CHIC) which takes into account head injuries caused by non-direct impact or by inertial loading becomes crucial.

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