Using nurbs as response surface for membrane material behavior
Visualitza/Obre
Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/185424
Tipus de documentText en actes de congrés
Data publicació2013
EditorCIMNE
Condicions d'accésAccés obert
Tots els drets reservats. Aquesta obra està protegida pels drets de propietat intel·lectual i
industrial corresponents. Sense perjudici de les exempcions legals existents, queda prohibida la seva
reproducció, distribució, comunicació pública o transformació sense l'autorització del titular dels drets
Abstract
This work proposes a NURBS for the determination of a smooth response surface relating biaxial strains and stresses from discrete test data. These NURBS surfaces are based on two axes of strain and one axis of stress. The constitutive material tensor is calculated with the derivatives of the NURBS surfaces and curves. The motivation of the proposed work came from the use of new materials in membrane structures that requires complex material models to describe the complex material behavior. A method for the establishment of a matrix of material coefficients from these surfaces is developed aiming its application in finite element models. The response surface stress-strain relation and the material matrix derived are compared to classical hyperelastic and MooneyRivlin material models. The response surface approach using NURBS allows for an easy implementation in an existent FE code, requiring few changes. A similar application is found in the work of Bridgens and Gosling [1]. This approach provides a direct correlation between stresses and strains in the wide range of possible stress paths the material is subject to. Curve fitting based on least squares approximation is employed to generate NURBS surfaces for the experimental data. The advantage of this material model is that a smooth stress-strain response surface can be obtained directly from the experimental results. On the other hand, in order to generate good NURBS surfaces the experimental data should provide an adequate point distribution. This could require a large range of experimental data. We conclude that this material model is a good alternative to conventional material models for complex material behavior.
ISBN978-84-941686-0-4
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
MEMBRANES_2013-15_Using nurbs as response.pdf | 2,066Mb | Visualitza/Obre |