Optimization of single skin surfaces for head injury prevention - a comparison of optima calculated for global versus local injury thresholds
2004 (English)In: International Journal of Crashworthiness, ISSN 1358-8265, E-ISSN 1754-2111, Vol. 9, no 4, 365-379 p.Article in journal (Refereed) Published
This paper describes optimizations of material properties for a bonnet-like plate using finite element calculations and the Euro-NCAP pedestrian head impact test. Four different head models were used for the impact simulations, a Euro-NCAP dummy head, a Hybrid III dummy head and two biomechanical head models exhibiting different mechanical properties for the brain tissue. The objective function was to minimize the displacement of the bonnet plate while satisfying constraints on the head injury criterion (HIC), the resultant contact force and, for the human head models, the strain in the brain tissue. An investigation was also conducted of the kinematics of the head models during impact, evaluating the energy distribution and the apparent mass. The analysis gave at hand that optimization of the plate with respect to impact with the Euro-NCAP and Hybrid III head models reached substantially, different results compared to impact with the biomechanical head models. For the latter case, the stiffness of the brain tissue influenced which constraints were active in the final solution. The investigation of the kinematics at impact showed that a substantial portion of energy was confined within the brain during impact for the biomechanical head models. The apparent mass at impact coincided with the actual mass for the rigid dummy heads while for the human head models it was roughly the mass of the skull only.
Place, publisher, year, edition, pages
2004. Vol. 9, no 4, 365-379 p.
head injury, finite element method (FEM), Pedestrian, Euro-NCAP, optimization, brain-tissue, impedance
Vehicle Engineering Other Medical Biotechnology
IdentifiersURN: urn:nbn:se:kth:diva-23807DOI: 10.1533/ijcr.2004.0296ISI: 000224483300004ScopusID: 2-s2.0-6344237185OAI: oai:DiVA.org:kth-23807DiVA: diva2:342506
QC 201110312010-08-102010-08-102016-05-16Bibliographically approved