Title
Mechanisms of soft cellular tissue bruising : a particle based simulation approach Mechanisms of soft cellular tissue bruising : a particle based simulation approach
Author
Faculty/Department
Faculty of Sciences. Mathematics and Computer Science
Publication type
article
Publication
Cambridge ,
Subject
Physics
Chemistry
Source (journal)
Soft matter. - Cambridge
Volume/pages
7(2011) :7 , p. 3580-3591
ISSN
1744-683X
ISI
000288677200067
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
This paper is concerned with modeling the mechanical behavior of cellular tissue in response to dynamic stimuli. The objective is to investigate the formation of bruises and other damage in tissue under excessive loading. We propose a particle based model to numerically study cells and aggregates of cells described on to subcellular detail. The model focuses on a parenchyma cell type in which two important features are present: the cell's interior liquid-like phase inducing hydrodynamic phenomena; and the cell wall, a viscoelastic-plastic solid membrane that encloses the protoplast. The cell fluid is modeled by a Smoothed Particle Hydrodynamics (SPH) technique, while for the cell wall and cell adhesion a nonlinear discrete element model is proposed. Failure in the system is addressed to either cell wall rupture or to debonding of the middle lamella. We show that the model is able to reproduce experimental data of quasistatic compression, and investigate the role of the protoplasm viscosity and the cellular structure on the dynamics of the aggregate system. This indicates that a high viscosity causes better guidance of mechanical stresses through the tissue and can result in a higher penetration of damage, whereas low values will cause more local bruising effects.
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