Computer Modeling of the Body-Head-Helmet System. Volume I.
AUBURN UNIV ALA SCHOOL OF ENGINEERING
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Three dimensional finite element methods of analysis were applied to the body-head-helmet structural system under conditions of static equilibrium and to the head-helmet assembly in a dynamic mode. Computer programs were written to generate the three dimensional grids, to evaluate inertial properties, and to process and display results of the structural analyses. Static analysis, using a fixed configuration, is applicable to the description of displacement and stress component fields in the system. The results of this mode of analysis have the potential of yielding information related to loss of consciousness due to impact situations. Dynamic structural analysis was performed on a computer generated pseudospherical model simulating the drop test. Results provide time traces of the displacement, velocity, acceleration, and stress components at selected nodal points and elements of the system. Methods were demonstrated for the determination of a number of parameters of potential or proven value in evaluating crash protection or crash severity. These include linear acceleration profile, rotational acceleration profile, shear stress, skull deflection, severity index, mass moments of inertia, and regional centers of gravity. Six specific recommendations were made for steps to be taken in applying finite element simulation to helmet design.
- Protective Equipment