Micro-CT-Based Three-Layer Finite Element Model for Quasi-Static Human Skull Impact
Technical Report,01 Jan 2018,30 Sep 2019
CCDC Army Research Laboratory Aberdeen Proving Ground United States
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Recently, quasi-static indentation experiments on human skull specimens were uniquely designed and performed at the US Army Combat Capabilities Development Command Army Research Laboratory to study the deformation and failure responses and associated mechanisms. The fully instrumented experiments involved skullcap specimens which included more of the 3-D curvature of the skull than coupon-level studies, thereby the multi-axial stress state that governs the impact response more closely represented in vivo loading conditions. Here, one of the indentation experiments on a human parietal skullcap was modeled using finite element simulation, with a simplified concept specifically developed to ease transition of the methodology into larger-scale simulations involving the whole head. The region of the skullcap near the point of loading included the full thickness of the skull, with both the outer and inner surfaces intact. This central region was modeled as a composite of three layers the outer table, mid-diploe, and inner table. The relative thickness of each of the layers was specified to match the thickness measurements previously reported using a quantitative method for identification of layer boundaries. In the regions away from the point of loading, the skullcap was modeled as a single, composite homogeneous layer.
- Anatomy and Physiology