B-27 Thorax FE model for older population

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  • Thorax FE model for older population

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The objective of this study is to collect precise material and structural properties of older population and build a anatomically detailed finite element thorax model to predict crash induced chest injuries. Whole twelve ribs in right side of ribcages from seven fresh cadavers were prepared for microCT scan and three-point bending test. The thickness distribution of cortical bone was measured from microCT images. Nine cross sections in the axial direction and sixteen points along the circumferences in each cross section were sampled to measure the cortical bone thicknesses distribution. Each rib was dissected equally into the three pieces (anterior, lateral, and posterior) for three-point bending test. Bending stiffness and fracture moment were measured and statistically analyzed with regions (i.e., anterior, lateral, and posterior in axial direction) and rib levels. A finite element thorax model was built by taking these detailed material and geometric information into consideration. The rib fracture behavior was simulated by modeling both cortical and trabecular bones using elasto-plastic with damage material type (EWK in Pam-Crash). Model response to impact (Kroell's frontal pendulum) and dynamic (Kent's hub, distributed, single and double diagonal) loadings is provided in this paper.

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