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@article{2355281, author = {Turcanova, Michaela and Fischer, Jiri and Hermanová, Markéta and Bednařík, Zdeněk and Skacel, Pavel and Bursa, Jiri}, article_location = {OXFORD}, article_number = {December 2023}, doi = {http://dx.doi.org/10.1016/j.jbiomech.2023.111868}, keywords = {Arterial wall; Collagen; Fibre direction; Fibre waviness; Concentration parameter}, language = {eng}, issn = {0021-9290}, journal = {JOURNAL OF BIOMECHANICS}, title = {Biaxial stretch can overcome discrepancy between global and local orientations of wavy collagen fibres}, url = {https://www.sciencedirect.com/science/article/pii/S0021929023004396?via%3Dihub}, volume = {161}, year = {2023} }
TY - JOUR ID - 2355281 AU - Turcanova, Michaela - Fischer, Jiri - Hermanová, Markéta - Bednařík, Zdeněk - Skacel, Pavel - Bursa, Jiri PY - 2023 TI - Biaxial stretch can overcome discrepancy between global and local orientations of wavy collagen fibres JF - JOURNAL OF BIOMECHANICS VL - 161 IS - December 2023 SP - 1-8 EP - 1-8 PB - ELSEVIER SCI LTD SN - 00219290 KW - Arterial wall KW - Collagen KW - Fibre direction KW - Fibre waviness KW - Concentration parameter UR - https://www.sciencedirect.com/science/article/pii/S0021929023004396?via%3Dihub N2 - Most 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. ER -
TURCANOVA, Michaela, Jiri FISCHER, Markéta HERMANOVÁ, Zdeněk BEDNAŘÍK, Pavel SKACEL and Jiri BURSA. Biaxial stretch can overcome discrepancy between global and local orientations of wavy collagen fibres. \textit{JOURNAL OF BIOMECHANICS}. OXFORD: ELSEVIER SCI LTD, 2023, vol.~161, December 2023, p.~1-8. ISSN~0021-9290. Available from: https://dx.doi.org/10.1016/j.jbiomech.2023.111868.
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