Mechanical characterisation of porcine rectus sheath under uniaxial and biaxial tension

Lyons, Mathew; Winter, D. C.; Simms, Ciaran

doi:10.1016/j.jbiomech.2014.03.009

Cited by 31 publications

(13 citation statements)

References 26 publications

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“…Typically the goal of such tests is to determine the material stress-strain behaviour from measured forces and displacements. The experimental measurement of strain at a central region of interest (ROI) in biaxial tests, using methods such as digital image correlation (DIC), has been well established (Humphrey et al, 1990a;Lyons et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

On the correct interpretation of measured force and calculation of material stress in biaxial tests

Nolan

McGarry

2016

Journal of the Mechanical Behavior of Biomedical Materials

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Section: Introductionmentioning

confidence: 99%

On the correct interpretation of measured force and calculation of material stress in biaxial tests

Nolan

McGarry

2016

Journal of the Mechanical Behavior of Biomedical Materials

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“…In conclusion, an implanted hernia repair graft experiences complex multi-axial loads, ranging from diffuse passive loads from intra-abdominal pressure acting orthogonal to the graft surface to varying in-plane active loads from contracting adjacent musculature acting at the graft perimeter (Lyons et al, 2014). Ball-burst tests (Whitson et al, 1998;Freytes et al, 2005;Deeken et al, 2012;Eliason et al, 2011;Sahoo et al, 2014), planar-biaxial tests (Rohrnbauer and Mazza, 2014;Sun et al, 2005;Lyons et al, 2014;Sahoo et al, 2014), and also inflation tests (Rohrnbauer and Mazza, 2013) can each partly replicate this complex physiologic loading mechanism through their respective modes of loading, and offer different considerations as options for testing hernia grafts.…”

Section: Discussionmentioning

confidence: 99%

“…Ball-burst tests (Whitson et al, 1998;Freytes et al, 2005;Deeken et al, 2012;Eliason et al, 2011;Sahoo et al, 2014), planar-biaxial tests (Rohrnbauer and Mazza, 2014;Sun et al, 2005;Lyons et al, 2014;Sahoo et al, 2014), and also inflation tests (Rohrnbauer and Mazza, 2013) can each partly replicate this complex physiologic loading mechanism through their respective modes of loading, and offer different considerations as options for testing hernia grafts. This study used ball-burst and planar-biaxial tests to test hernia grafts as sutured constructs to model the manner in which the grafts are placed and loaded clinically for ventral hernia repair.…”

Section: Discussionmentioning

confidence: 99%

Clinically relevant mechanical testing of hernia graft constructs

Sahoo

DeLozier

Erdemir

et al. 2015

Journal of the Mechanical Behavior of Biomedical Materials

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“…Though authors have highlighted the challenges unique to biological tissues related to the planning and the performance of biaxial experiments, the limitations concerning the inadequacy of uniaxial tests in fully reproducing the in situ loading of soft tissues and in disclosing their profound anisotropy has been enhanced [6], [7]. Hence, both uniaxial [2], [4], [8]- [11] and biaxial [12]- [16] tensile tests are still being adopted aiming at investigating the mechanical properties of collagenous tissues, often in conjunction [6], [17]. The characterization of tissues mechanical response turns out to be fundamental also for the development of constitutive models and the subsequent definition of material properties exploitable in Finite Element (FE) studies.…”

Section: Introductionmentioning

confidence: 99%

A Constitutive Framework for Human Dermis Mechanical Modelling

Aldieri¹,

Terzini²,

Bignardi³

et al. 2017

WIT Transactions on Engineering Sciences

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Finite element models, in conjunction with adequate constitutive relations of the materials involved, have proved to be crucial in many medical applications, such as in surgical planning. Nevertheless, a thorough numerical analysis of dermis' mechanical response is a challenging research area because of dermis' highly anisotropic and nonlinear behaviour. The aim of this work has been to assess the performance of two orthotropic and one isotropic hyper-elastic constitutive laws, providing an experimental-computational framework for the definition of reliable constitutive models of dermis tissue. Experimental, equi-biaxial stress-strain data obtained on human reticular dermis specimens have been exploited in order to extract, through a stochastic optimization procedure, constitutive parameters of three widely used constitutive laws: the Ogden, Holzapfel and Gasser-Ogden-Holzapfel (GOH) models. A set of specimen specific parameters and a set of best matching parameters, determined by simultaneously fitting all experimental stress-strain curves, have been obtained. The goodness of the selected laws has been assessed by means of FEM simulations performed in Abaqus (Simulia, Dessault Systèmes Inc.) which reproduce the actual specimen boundary conditions and geometry, rebuilt through an image segmentation process implemented in MATLAB (The MathWorks, Inc.). Models have been validated comparing experimental and numerical outcomes related to reference points on the specimen surface. In the preliminary fitting phase, Normalized Root Mean Square Error values were above 0.9 for the specimen-specific and above 0.54 for the best matching models. The comparison between numerical and experimental outcomes has highlighted the inadequacy of the isotropic constitutive law in reproducing the dermis behaviour, particularly at higher stretch levels. Errors obtained in the horizontal loading direction are lower than 40% for Holzapfel and GOH models, while the Ogden model reaches the 80%. Lower and more uniform errors occur in the orthogonal direction, which settles below 30% for the orthotropic laws, while it increases up to 40% in the isotropic case.

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Mechanical characterisation of porcine rectus sheath under uniaxial and biaxial tension

Cited by 31 publications

References 26 publications

On the correct interpretation of measured force and calculation of material stress in biaxial tests

On the correct interpretation of measured force and calculation of material stress in biaxial tests

Clinically relevant mechanical testing of hernia graft constructs

A Constitutive Framework for Human Dermis Mechanical Modelling

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