96171 20210902121618.0 doi 10.1111/str.12331 sideral 116092 ART-2020-116092 eng Cilla, Miryam (orcid)0000-0002-8503-9291 Analysis of the accuracy on computing nominal stress in a biaxial test for arteries 2020 Access copy available to the general public Unrestricted Biaxial tests are commonly used to investigate the mechanical behaviour of anisotropic soft biological tissues such as cardiovascular tissues. However, there is still no clear understanding of the influence that the biaxial test set-up conditions may have on the computing material stress of the experimental results. The aim of the present study is to further investigate the accuracy of calculated material stress from measured force during biaxial tests using finite element methods (FEM). The biaxial mechanical response of ascending aorta and pulmonary artery tissue samples was obtained by FEM simulation under two different gripping methods: (a) a system with noodle clamps and (b) a clamped system with needles which leave the specimen's edges free to expand laterally. The results show that the clamped method whose joints allow free movement in the lateral direction produces stresses closer to the universally accepted formulation of biaxial material stress in the central region. However, the system with noodle clamps, commonly used to grip the sample, produces an alteration of the measurement stresses. Our simulations show results giving an inaccurate estimation of the stress at the centre of the sample. In some cases, the stresses are overestimated and in others underestimated depending on the anisotropy of the sample. We can conclude that the clamped system with needles which leave the specimen's edges free to expand laterally should be used as an efficient methodology to other commonly used gripping methods for biological tissues with anisotropic materials. info:eu-repo/grantAgreement/ES/DGA/LMP121-18 info:eu-repo/grantAgreement/ES/DGA/T24-17R info:eu-repo/grantAgreement/ES/MINECO/DPI2016-76630-C2-1-R info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 1.848 2020 MATERIALS SCIENCE, CHARACTERIZATION & TESTING 17 / 32 = 0.531 2020 Q3 T2 0.476 2020 Mechanics of Materials 2020 Q2 Mechanical Engineering 2020 Q2 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Corral, A.V. Peña Baquedano, Juan Antonio Universidad de Zaragoza (orcid)0000-0002-4268-7424 Peña Baquedano Estefania Universidad de Zaragoza (orcid)0000-0002-0664-5024 5002 305 Universidad de Zaragoza Dpto. Ingeniería Diseño Fabri. Área Expresión Gráfica en Ing. 5004 605 Universidad de Zaragoza Dpto. Ingeniería Mecánica Área Mec.Med.Cont. y Teor.Est. 56, 1 (2020), e12331 1-13 Strain STRAIN 0039-2103 5610757 http://zaguan.unizar.es/record/96171/files/texto_completo.pdf Postprint 387830 http://zaguan.unizar.es/record/96171/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:96171 articulos driver 2021-09-02-08:45:52 ARTICLE