Constitutive models and failure properties of fibrous tissues of carotid artery atheroma based on their uniaxial testing

Lisický, Ondřej; Hrubanová, Anna; Staffa, Robert; Vlachovský, Robert; Burša, Jiří

doi:10.1016/j.jbiomech.2021.110861

Cited by 6 publications

(4 citation statements)

References 39 publications

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“…The potential of full-field methods is especially important for diseased soft tissues such as atherosclerotic arteries, the heterogeneity of which disables creation of a regular specimen shape. [11,[49][50][51] In addition to material non-homogeneity, a high variation may result from non-uniform specimen thickness violating the needed assumptions of the test [52] ; also these errors can be decreased by using the proposed IR approach.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of image registration for measuring deformation fields in soft tissue mechanics

Lisický

Avril

Eydan

et al. 2022

Strain

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High‐fidelity biomechanical models usually involve the mechanical characterisation of biological tissues using experimental methods based on optical measurements. In most experiments, strains are evaluated based on displacements of a few markers and represents an average within the region of interest (ROI). Full‐field measurements may improve description of non‐homogeneous materials such as soft tissues. The approach based on non‐rigid image registration is proposed and compared with standard digital image correlation (DIC) on a set of samples, including (i) complex heterogeneous deformations with sub‐pixel displacement, (ii) a typical uniaxial tension test of aorta, and (iii) an indentation test on skin. The possibility to extend the ROI to the whole sample and the exploitation of a natural tissue pattern represents the main assets of the proposed method whereas the results show similar accuracy as standard DIC when analysing sub‐pixel deformations. Therefore, displacement and strain fields measurement based on image registration is very promising to characterise heterogeneous specimens with irregular shapes and/or small dimensions, which are typical features of soft biological tissues.

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Section: Discussionmentioning

confidence: 99%

Evaluation of image registration for measuring deformation fields in soft tissue mechanics

Lisický

Avril

Eydan

et al. 2022

Strain

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“…Each ring was cut axially and the created specimen was clamped in a tensile tester (Camea s.r.o., Czech Republic). A pre-load of 0.01 N was applied to straighten the specimen (in saline bath at 37 °C) and then load was increased till rupture (Lisický et al, 2021).…”

Section: Mechanical Testingmentioning

confidence: 99%

“…Here the knowledge of geometry, loading conditions and material characteristics is crucial. Various mechanical tests such as uniaxial (Lisický et al, 2021) or equibiaxial (Polzer et al, 2015). (Cunnane et al, 2016), or inflation tests (Sommer et al, 2010) are used to obtain artery wall response.…”

Section: Introductionmentioning

confidence: 99%

Influence of Artery Unfoldment on Its Mechanical Response

Sochor,

Hrubanová,

Joukal

et al. 2024

Engineering Mechanics

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This study investigates the influence of artery unfoldment on its mechanical response in planar tension test. Inflation test was chosen for comparison because, with the axial stretch λz = 1, it also keeps plane strain condition. Both tests were simulated in silico using finite element method. The geometry models correspond to aorta and common carotid artery with distinguished two layers within the arterial wall; a homogenous wall model was also used for comparison. Material models were acquired by fitting the uniaxial tension tests of human carotid arteries dissected into media and adventitia layers with 3 rd order Yeoh hyperelastic model. The results showed that the artery segment straightening leads to a non-uniform stress distribution throughout the specimen thickness with the maximum stress located at the inner surface of the artery. By comparing stresses (averaged throughout the thickness) at specified strain levels up to 30 %, the influence of specimen unfoldment was estimated with inflation test taken as a basis. For the carotid artery, stresses in the planar tension test were higher by 27−61 % while for the aorta the difference was between 8 and 17 %. The difference between individual arteries occurs due to the varying thickness-to-radius ratio.

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“…The sample thickness was measured by dial indicator (MarCator 1075, produced by Mahr, Germany, accuracy 0.01 mm, pin diameter 4.1 mm) at 5 locations of each specimen; the mean value is used for further analysis. After clamping a pre-tension of 0.1 N was applied to each specimen to ensure its flatness (Lisický, 2021). The testing is displacement controlled; three different displacement speeds…”

Section: Testing and Evaluationmentioning

confidence: 99%

Experimental Assessment of the Mechanical Behavior of Impression Material for Anaesthesiology Use: A Preliminary Study

Thomková,

Hrubanová,

Košková

et al. 2024

Engineering Mechanics

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This study examines a silicone material designed for a high precision impressions. We explore the possibility of using this material for creation of patient specific obturator for soft tissue protection of upper jaw while intubating neonatal patients with cleft palate. The biaxial tensile tests were performed to examine the material properties of the selected silicon material. Specimen were compressed in 2-part mold made by 3D printing technology. The preliminary results suggest isotropic properties (p-value 0.198), showing no statistically significant differences between measured directions. The study also suggests potential viscoelastic behavior since the slowest deformation speed showed slightly different behavior compared to the higher strain rate. However, this is just a preliminary study thus, to strengthen the study's reliability, further validation on larger datasets is recommended.

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Constitutive models and failure properties of fibrous tissues of carotid artery atheroma based on their uniaxial testing

Cited by 6 publications

References 39 publications

Evaluation of image registration for measuring deformation fields in soft tissue mechanics

Evaluation of image registration for measuring deformation fields in soft tissue mechanics

Influence of Artery Unfoldment on Its Mechanical Response

Experimental Assessment of the Mechanical Behavior of Impression Material for Anaesthesiology Use: A Preliminary Study

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