Viscoelastic properties of pig kidney in shear, experimental results and modelling |
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Authors: | Simin Nasseri Lynne E Bilston Nhan Phan-Thien |
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Institution: | (1) School of Aerospace Mechanical and Mechatronic Engineering The University of Sydney N.S.W., 2006, Australia e-mail: bilston@mech.eng.usyd.edu.au, AU |
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Abstract: | In this paper, the results from a series of rheological tests of fresh pig kidney have been reported. Using a standard strain-controlled
rheometer, the oscillation strain sweep experiment showed a linear viscoelastic strain limit of the order of 0.2% strain.
To determine the components of dynamic moduli in terms of frequency, shear oscillation tests were done at strain 0.2% using
a stress-controlled rheometer. Shear stress relaxation tests were carried out with a fixed strain of 0.2% and 0.02 s rise
time. The model we have developed uses a multi-mode upper convected Maxwell (UCM) model with variable viscosities and time
constants, to which we have added a Mooney hyper-elastic response, both multiplied by a damping function. Different forms
of damping functions that control the non-linearity of strain-stress profile have been tested. The model was fitted to our
experimental data, and matched the entire test data reasonably well with a single set of parameters.
Received: 5 May 2000 Accepted: 16 March 2001 |
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Keywords: | Rheology Biomechanics Viscoelasticity Kidney tissue |
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