Vol. 6, No. 7-8, 2011

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Porcine dermis in uniaxial cyclic loading: Sample preparation, experimental results and modeling

Alexander E. Ehret, Marc Hollenstein, Edoardo Mazza and Mikhail Itskov

Vol. 6 (2011), No. 7-8, 1125–1135
Abstract
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We present a straightforward technique to prepare thin samples of planar or bulky soft tissue with very accurate geometry. The experimental procedure includes the preparation of thin slices of tissue by means of a surgical dermatome and specimen extraction by die cutters. We illustrate this method in application to porcine dermal tissue. The prepared specimens were subjected to uniaxial cyclic tension along and across the lines of cleavage with increasing upper stretch limits. Besides a distinct anisotropic and nonlinear behavior, cyclic loading caused considerable preconditioning effects including softening and substantial residual deformations. This observed behavior is well represented by a recently proposed constitutive model accounting for the elastic and dissipative behavior of soft tissues.

Keywords
dermis, anisotropy, constitutive modeling, preconditioning, soft tissues, mechanical testing, cyclic loading
Milestones
Received: 1 July 2010
Revised: 10 December 2010
Accepted: 10 January 2011
Published: 21 December 2011
Authors
Alexander E. Ehret
Department of Continuum Mechanics
RWTH Aachen University
52056 Aachen
Germany
Marc Hollenstein
Institute for Mechanical Systems
ETH Zurich
8092 Zurich
Switzerland
Edoardo Mazza
Institute for Mechanical Systems
ETH Zurich
8092 Zurich
Switzerland
EMPA
8600 Dübendorf
Switzerland
Mikhail Itskov
Department of Continuum Mechanics
RWTH Aachen University
52056 Aachen
Germany