Bladder tissue biomechanical behavior: Experimental tests and constitutive formulation.

Authors:
elisabetta zanetti
elisabetta zanetti
Università degli Studi di Perugia
Assistant Professor
biomechanics, biomaterials
Perugia, Umbria | Italy

J Biomech 2015 Sep 28;48(12):3088-96. Epub 2015 Jul 28.

Department of Engineering, University of Perugia, Via Duranti 65, 06125 Perugia, Italy.

A procedure for the constitutive analysis of bladder tissues mechanical behavior is provided, by using a coupled experimental and computational approach. The first step pertains to the design and development of mechanical tests on specimens from porcine bladders. The bladders have been harvested, and the specimens have been subjected to uniaxial cyclic tests at different strain rates along preferential directions, considering the distribution of tissue fibrous components. Experimental results showed the anisotropic, non-linear and time-dependent stress-strain behavior, due to tissue conformation with fibers distributed along preferential directions and their interaction phenomena with ground substance. In detail, experimental data showed a greater tissue stiffness along transversal direction. Viscous behavior was assessed by strain rate dependence of stress-strain curves and hysteretic phenomena. The second step pertains the development of a specific fiber-reinforced visco-hyperelastic constitutive model, in the light of bladder tissues structural conformation and experimental results. Constitutive parameters have been identified by minimizing the discrepancy between model and experimental data. The agreement between experimental and model results represent a term for evaluating the reliability of the constitutive models by means of the proposed operational procedure.

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.jbiomech.2015.07.021DOI Listing
September 2015
48 Reads
2.751 Impact Factor

Publication Analysis

Top Keywords

preferential directions
8
step pertains
8
bladder tissues
8
experimental data
8
experimental
7
constitutive
5
fibers distributed
4
discrepancy model
4
conformation fibers
4
tissue conformation
4
distributed preferential
4
interaction phenomena
4
identified minimizing
4
ground substance
4
phenomena ground
4
behavior tissue
4
directions interaction
4
minimizing discrepancy
4
time-dependent stress-strain
4
experimental model
4

Similar Publications