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Strain-rate dependent material properties of the porcine and human kidney capsule

Snedeker, J G
Niederer, P
Farshad, M
Demetropoulos, C K
Lee, J B
Yang, K H
Published in Journal of Biomechanics. 2005, vol. 38, no. 5, p. 1011-21
Abstract This study was performed to characterize the mechanical properties of the kidney capsular membrane at strain-rates associated with blunt abdominal trauma. Uniaxial quasi-static and dynamic tensile experiments were performed on fresh, unfrozen porcine and human renal capsules at deformation rates ranging from 0.0001 to 7 m/s (strain-rates of 0.005-250 s(-1)). Single stroke, dynamic tests were performed on samples of porcine renal capsule at strain-rates of 0.005 s(-1) (n = 33), 0.05 s(-1) (n = 17), 0.5 s(-1) (n = 38), 2 s(-1) (n = 10), 4 s(-1) (n = 10), 50 s(-1) (n = 21), 100 s(-1) (n = 18), 150 s(-1) (n = 17), 200 s(-1) (n = 10), and 250 s(-1) (n = 17). Due to limited availability of human tissues, only quasi-static tests were performed (0.005 s(-1), n = 25). Porcine renal capsule properties were found to match the material properties of human capsular tissue sufficiently well such that porcine tissue material can be used as a human test surrogate. The apparent elastic modulus and breaking stress of the porcine renal capsule were observed to increase significantly with increasing strain-rate (p < 0.01). Breaking strain was inversely related to strain-rate (p < 0.01). The effect of increasing strain-rate on material properties diminished appreciably at rates exceeding 150 s(-1). Empirically derived mathematical models of constitutive behavior were developed using a hyperelastic/viscoelastic Ogden formulation, as well as a Cowper-Symonds law material curve multiplication.
Keywords AnimalsComputer SimulationElasticityHumansKidney/physiologyMembranes/physiologyModels, BiologicalSpecies SpecificityStress, MechanicalSwineTensile Strength/physiologyViscosity
PMID: 15797583
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Research group Groupe Iselin Christophe (urologie) (106)
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SNEDEKER, J G et al. Strain-rate dependent material properties of the porcine and human kidney capsule. In: Journal of Biomechanics, 2005, vol. 38, n° 5, p. 1011-21. https://archive-ouverte.unige.ch/unige:40267

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Deposited on : 2014-09-18

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