Simulace nelineárně elastických ortotropních vlastností tepny pomocí izotropních konečných prvků

Simulation of non-linear elastic orthotropic properties of artery using isotropic finite elements

conference paper

Czech

This report analyses the possibility of the computional modeling of nonlinear elastic orthotropic materials in FEM system ANSYS, which does not have any finite elements dealing with a nonlinear elastic orthotropic material model. The computional analysis of those materials is demonstrated on a segment of an artery. Stiffeners in the axial direction create a composite structure which models orthotropic nonlinear material properties. The axial stiffening is modeled by finite elements, by a modification of the wall structure and by the modification of material properties of the stiffeners. This composite model of the arterial provides an idea about the influence of orthotropic properties on its deformation and stress state. The results show a disagreement with a model using the homogeneous isotropic nonlinear elastic material behaviour. The explanation may be found in an invalidity of the superposition principle under large displacements of the nonlinear elastic material.

This report analyses the possibility of the computional modeling of nonlinear elastic orthotropic materials in FEM system ANSYS, which does not have any finite elements dealing with a nonlinear elastic orthotropic material model. The computional analysis of those materials is demonstrated on a segment of an artery. Stiffeners in the axial direction create a composite structure which models orthotropic nonlinear material properties. The axial stiffening is modeled by finite elements, by a modification of the wall structure and by the modification of material properties of the stiffeners. This composite model of the arterial provides an idea about the influence of orthotropic properties on its deformation and stress state. The results show a disagreement with a model using the homogeneous isotropic nonlinear elastic material behaviour. The explanation may be found in an invalidity of the superposition principle under large displacements of the nonlinear elastic material.

Artery, orthotropy, material non-linearity, composite material

VAJDÁK, M., BURŠA, J.

2002

13. 5. 2002

Institute of Mechanics of Solids Faculty of Mechanical Engineering Brno University of Technology

Svratka, ČR

80-214-2109-6

Inženýrská mechanika 2002 Engineering Mechanics 2002

297

298

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