Abstract
Head injury models in two geometries with pulse loading were investigated to study the phenomenon of wave propagation in viscoelastic brain tissue. One-dimensional and two-dimensional Lagrangian finite-difference computer formulations were used. The brain material was modeled both as a perfect fluid and as a viscoelastic material. A geometric description of the head was obtained from a human skull. The material properties for the bone and brain tissue were obtained by interpreting previously reported experimental data. The one-dimensional model results show signal attenuation and considerable delay in the arvival of activity when viscoelastic properties are used. The two-dimensional viscoelastic model gives results that show significantly lower (≈35%) compression and rarefaction levels as compared to the “perfect fluid” twodimensional model. Locations of possible trauma are identified by comparisons between the computer solutions and experimental measurements.
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