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Linear viscoelastic properties of bovine brain tissue in shear
L E Bilston1, Z Liu, N Phan-Thien
1Department of Mechanical and Mechatronic Engineering, University of Sydney, New South Wales, Australia. bilston@mech.eng.usyd.edu.au
Abstract:
We report the results from a series of rheological tests of fresh bovine brain tissue. Using a standard Bohlin VOR shear rheometer, shear relaxation and oscillating strain sweep experiments were performed on disks of brain tissue 30 mm in diameter, with a thickness of 1.5-2 mm. The strain sweep experiment showed that the viscoelastic strain limit is of the order of 0.1% strain. Shear relaxation data do not indicate the presence of a long-term elastic modulus, indicating fluid-like behavior. A relaxation spectrum was calculated by inverting the experimental data and used to predict oscillatory response, which agreed well with measured data.