The nonlinearity of brain tissue material behavior for large deformations at high strain rates was investigated. The viscoelastic properties of brain tissue under high rate ramp-and hold shear strains were determined and nonlinearity in the elastic and time dependent properties of the tissue were examined based on modeling the experimental data. The results revealed that the elastic response of brain tissue is linear from 10% to 50% shear strain, but the time dependent part of the properties in short times shows nonlinear behavior.
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