Side Impact: Influence of Impact Conditions and Bone Mechanical Properties on Pelvic Response Using a Fracturable Pelvis Model

The authors discuss a study to determine how occupant mechanical properties and impact conditions influence side impact pelvic response. Dynamic tests on both whole cadavers and isolated pelvic bones were used to validate a fracturable pelvis model that had been developed for study purposes. The model reproduced pelvic response and tolerance variation among individuals by coupling the section thickness of a fixed cortical bone within a single subject's pelvis and across the population with a pelvic bone parametric material law. Strong, medium, and fragile pelvic bones for the 50th percentile male were also identified using three material laws. The model allowed pelvic response under the influence of surface shape, velocity, and impact mass to be examined. The four main impactors reported in literature had shape differences that study results indicated had little pelvic response effect. Pelvic loading relationship using different impact mass and velocity combinations under iso-energy conditions was determined. This relationship formed the basis for establishing a pelvic response corridor in terms of impact energy versus pelvis loading by scaling and combining existing data from different impactor tests. This model also investigated the relationship between pelvic response and tolerance and the mechanical properties of bones. Aging-related changes in mechanical properties had a greater effect than pelvic mechanical response on pelvic tolerance. The authors note that pelvic loading response should be scaled by 0.1% and pelvic tolerance should be scaled by 0.4% annually given the assumption that pelvic bone ultimate stress in 25 to 80 year olds decreases 0.4% annually. The authors also note that since the model described is global, rather than descriptive, it cannot be used for detailed analysis.


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  • Accession Number: 01046237
  • Record Type: Publication
  • ISBN: 139780768018295
  • Files: TRIS
  • Created Date: Apr 10 2007 11:16AM