en
Scientific article
English

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

Published inJournal of biomechanics, vol. 38, no. 5, p. 1011-1021
Publication date2005
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
  • Animals
  • Computer Simulation
  • Elasticity
  • Humans
  • Kidney/physiology
  • Membranes/physiology
  • Models, Biological
  • Species Specificity
  • Stress, Mechanical
  • Swine
  • Tensile Strength/physiology
  • Viscosity
Citation (ISO format)
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. 1011–1021. doi: 10.1016/j.jbiomech.2004.05.036
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Article (Published version)
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ISSN of the journal0021-9290
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