Shear Properties of Human Brain Tissue

[+] Author and Article Information
B. R. Donnelly

Calspan-University at Buffalo Research Center, Box 400, Buffalo, NY 14225

J. Medige

Department of Mechanical Engineering, State University of New York at Buffalo, Buffalo, NY 14260

J Biomech Eng 119(4), 423-432 (Nov 01, 1997) (10 pages) doi:10.1115/1.2798289 History: Received June 12, 1994; Revised April 16, 1997; Online October 30, 2007


The objective of this study was to determine a relationship between shear stress and strain for human brain tissue by performing transient, single-pulse, high-rate, shear displacement tests. A constant velocity, parallel plate shear test device was designed and fabricated. This equipment generated constant rate shear strains in cylindrical tissue samples mounted between the shear plates. The transverse reaction force at the upper end of the sample was measured during the event with a sensitive quartz piezoelectric force transducer, thus obtaining the force associated with the displacement versus time ramp. Shear tests were performed on 125 tissue samples taken from twelve fresh cadaver brain specimens. The average true shear stress and finite strain were calculated. A nonlinear, viscoelastic, standard solid model was fit to the constant rate test data and the material constants were determined.

Copyright © 1997 by The American Society of Mechanical Engineers
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