2026-04-17T20:33:50Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/1838372025-07-16T22:43:14Zcom_2072_1033col_2072_452949

Determining the constitutive parameters of the human femoral vein in specific patients Fortuny, G. Herrera, B. Marimón, F. Marcé Nogué, Jordi Àrees temàtiques de la UPC::Matemàtiques i estadística::Anàlisi numèrica::Mètodes en elements finits Finite element method Plasticity -- Mathematical models Plasticity Femoral vein; Constitutive equations; Venous live tissue; Human; Parameter identification Elements finits, Mètode dels Plasticitat -- Models matemàtics Plasticitat This study suggests a method for computing the constitutive model for veins in vivo from clinically registered ultrasound images. The vein is modelled as a hyperelastic, incompressible, thin-walled cylinder and the membrane stresses are computed using strain energy. The material parameters are determined by tuning the membrane stress to the stress obtained by enforcing global equilibrium. In addition to the mechanical model, the study also suggests a preconditioning of the pressure-radius signal. The preconditioning computes an average pressure-radius cycle from all consecutive cycles in the registration and removes, or reduces undesirable disturbances. In order to overcome this problem, an approach is proposed that allows constitutive equations to be determined from clinical data by means of reasonable assumptions regarding in situ configurations and stress states of vein walls. The approach is based on a two-dimensional Fung-type stored-energy function that captures the characteristic nonlinear and anisotropic responses of veins 2011 Conference report Fortuny, G. [et al.]. Determining the constitutive parameters of the human femoral vein in specific patients. A: COMPLAS XI. "COMPLAS XI : proceedings of the XI International Conference on Computational Plasticity : fundamentals and applications". CIMNE, 2011, p. 741-747. 978-84-89925-73-1 https://hdl.handle.net/2117/183837 eng Open Access 7 p. application/pdf CIMNE