Biaxial stretch can overcome discrepancy between global and local orientations of wavy collagen fibres

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dc.contributor.authorTurčanová, Michaelacs
dc.contributor.authorFischer, Jiřícs
dc.contributor.authorHermanová, Markétacs
dc.contributor.authorBednařík, Zdeněkcs
dc.contributor.authorSkácel, Pavelcs
dc.contributor.authorBurša, Jiřícs
dc.coverage.issue12cs
dc.coverage.volume161cs
dc.date.issued2023-11-11cs
dc.description.abstractMost frequently used structure-based constitutive models of arterial wall apply assumptions on two symmetric helical (and dispersed) fibre families which, however, are not well supported with histological findings where two collagen fibre families are seldom found. Moreover, bimodal distributions of fibre directions may originate also from their waviness combined with ignoring differences between local and global fibre orientations. In contrast, if the model parameters are identified without histological information on collagen fibre directions, the resulting mean angles of both fibre families are close to +/- 45 degrees, which contradicts nearly all histologic findings. The presented study exploited automated polarized light microscopy for detection of collagen fibre directions in porcine aorta under different biaxial extensions and approximated the resulting histograms with unimodal and bimodal von Mises distributions. Their comparison showed dominantly circumferential orientation of collagen fibres. Their concentration parameter for unimodal distributions increased with circumferential load, no matter if acting uniaxially or equibiaxially. For bimodal distributions, the angle between both dominant fibre directions (chosen as measure of fibre alignment) decreased similarly for both uniaxial and equibiaxial loads. These results indicate the existence of a single family of wavy circumferential collagen fibres in all layers of the aortic wall. Bimodal distributions of fibre directions presented sometimes in literature may come rather from waviness of circumferentially arranged fibres than from two symmetric families of helical fibres. To obtain a final evidence, the fibre orientation should be analysed together with their waviness.en
dc.formattextcs
dc.format.extent1-8cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationJOURNAL OF BIOMECHANICS. 2023, vol. 161, issue 12, p. 1-8.en
dc.identifier.doi10.1016/j.jbiomech.2023.111868cs
dc.identifier.issn0021-9290cs
dc.identifier.orcid0000-0002-1054-4912cs
dc.identifier.orcid0000-0001-7451-3261cs
dc.identifier.orcid0000-0002-8504-1287cs
dc.identifier.orcid0000-0002-2960-185Xcs
dc.identifier.other186748cs
dc.identifier.scopus26422543800cs
dc.identifier.scopus6602676789cs
dc.identifier.urihttp://hdl.handle.net/11012/245120
dc.language.isoencs
dc.publisherELSEVIER SCI LTDcs
dc.relation.ispartofJOURNAL OF BIOMECHANICScs
dc.relation.urihttps://www.sciencedirect.com/science/article/pii/S0021929023004396cs
dc.rightsCreative Commons Attribution-NonCommercial 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/0021-9290/cs
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/cs
dc.subjectArterial wallen
dc.subjectCollagenen
dc.subjectFibre directionen
dc.subjectFibre wavinessen
dc.subjectConcentration parameteren
dc.titleBiaxial stretch can overcome discrepancy between global and local orientations of wavy collagen fibresen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-186748en
sync.item.dbtypeVAVen
sync.item.insts2025.02.03 15:49:19en
sync.item.modts2025.01.17 18:34:43en
thesis.grantorVysoké učení technické v Brně. Fakulta strojního inženýrství. Ústav mechaniky těles, mechatroniky a biomechanikycs
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