Viscoelastic properties of pig kidney in shear, experimental results and modelling


 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.

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Received: 5 May 2000 Accepted: 16 March 2001

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Nasseri, S., Bilston, L. & Phan-Thien, N. Viscoelastic properties of pig kidney in shear, experimental results and modelling. Rheol. Acta 41, 180–192 (2002).

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  • Key words Rheology
  • Biomechanics
  • Viscoelasticity
  • Kidney tissue