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Temperature and Strain Rate Effects on the Uniaxial Tensile Behaviour of ETFE Foils

With the first use of ETFE foils in building structures in the 1980s at the Burgers’ Zoo in Arnhem, Netherlands, the implementation of ETFE foils in roof and façade systems in large-span structures has become steadily more prominent. To safely design ETFE foil structures, their mechanical behaviour...

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Autores principales: Surholt, Felix, Uhlemann, Jörg, Stranghöner, Natalie
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9370974/
https://www.ncbi.nlm.nih.gov/pubmed/35956669
http://dx.doi.org/10.3390/polym14153156
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author Surholt, Felix
Uhlemann, Jörg
Stranghöner, Natalie
author_facet Surholt, Felix
Uhlemann, Jörg
Stranghöner, Natalie
author_sort Surholt, Felix
collection PubMed
description With the first use of ETFE foils in building structures in the 1980s at the Burgers’ Zoo in Arnhem, Netherlands, the implementation of ETFE foils in roof and façade systems in large-span structures has become steadily more prominent. To safely design ETFE foil structures, their mechanical behaviour has to be fundamentally understood. Until now, several research studies have been published investigating this material’s behaviour. However, the parameters influencing these plastic’s mechanical behaviour, such as the strain rate or the test temperature, have only been investigated separately but not simultaneously. In this contribution, an analytical model is presented which describes the mechanical behaviour of ETFE foils under varying test temperatures and strain rates simultaneously. The material model has been checked against experimental results achieved for materials from three different international producers and two different commonly used foil thicknesses with significant differences in their mechanical responses (so that it can be assumed that the international market is represented). In the first step, uniaxial tensile tests on strip specimens were performed to describe the nonlinear and viscoelastic temperature- and strain rate-dependent material behaviour under uniaxial tension. The achieved stress-strain curves exhibited, as expected, the two commonly so-called yield points, which can be taken as separators for three different material stages: viscoelastic, viscoelastic-plastic, and viscoplastic. In the second step, by separating the uniaxial tensile response into these three stages, two interdependent functions could be derived based on the well-known Ramberg-Osgood material model to simulate the viscoelastic and viscoelastic-plastic material behaviour of ETFE foils. For this purpose, analytical functions were developed to calculate the model parameters considering the influence of the test temperature and the test speed. It can be shown that the newly developed analytical material model fits well with the experimental results. With the use of the derived nonlinear material model, design engineers can predict the material’s mechanical behaviour considering the environmental conditions on site while maintaining independence from the material’s supplier.
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spelling pubmed-93709742022-08-12 Temperature and Strain Rate Effects on the Uniaxial Tensile Behaviour of ETFE Foils Surholt, Felix Uhlemann, Jörg Stranghöner, Natalie Polymers (Basel) Article With the first use of ETFE foils in building structures in the 1980s at the Burgers’ Zoo in Arnhem, Netherlands, the implementation of ETFE foils in roof and façade systems in large-span structures has become steadily more prominent. To safely design ETFE foil structures, their mechanical behaviour has to be fundamentally understood. Until now, several research studies have been published investigating this material’s behaviour. However, the parameters influencing these plastic’s mechanical behaviour, such as the strain rate or the test temperature, have only been investigated separately but not simultaneously. In this contribution, an analytical model is presented which describes the mechanical behaviour of ETFE foils under varying test temperatures and strain rates simultaneously. The material model has been checked against experimental results achieved for materials from three different international producers and two different commonly used foil thicknesses with significant differences in their mechanical responses (so that it can be assumed that the international market is represented). In the first step, uniaxial tensile tests on strip specimens were performed to describe the nonlinear and viscoelastic temperature- and strain rate-dependent material behaviour under uniaxial tension. The achieved stress-strain curves exhibited, as expected, the two commonly so-called yield points, which can be taken as separators for three different material stages: viscoelastic, viscoelastic-plastic, and viscoplastic. In the second step, by separating the uniaxial tensile response into these three stages, two interdependent functions could be derived based on the well-known Ramberg-Osgood material model to simulate the viscoelastic and viscoelastic-plastic material behaviour of ETFE foils. For this purpose, analytical functions were developed to calculate the model parameters considering the influence of the test temperature and the test speed. It can be shown that the newly developed analytical material model fits well with the experimental results. With the use of the derived nonlinear material model, design engineers can predict the material’s mechanical behaviour considering the environmental conditions on site while maintaining independence from the material’s supplier. MDPI 2022-08-02 /pmc/articles/PMC9370974/ /pubmed/35956669 http://dx.doi.org/10.3390/polym14153156 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Surholt, Felix
Uhlemann, Jörg
Stranghöner, Natalie
Temperature and Strain Rate Effects on the Uniaxial Tensile Behaviour of ETFE Foils
title Temperature and Strain Rate Effects on the Uniaxial Tensile Behaviour of ETFE Foils
title_full Temperature and Strain Rate Effects on the Uniaxial Tensile Behaviour of ETFE Foils
title_fullStr Temperature and Strain Rate Effects on the Uniaxial Tensile Behaviour of ETFE Foils
title_full_unstemmed Temperature and Strain Rate Effects on the Uniaxial Tensile Behaviour of ETFE Foils
title_short Temperature and Strain Rate Effects on the Uniaxial Tensile Behaviour of ETFE Foils
title_sort temperature and strain rate effects on the uniaxial tensile behaviour of etfe foils
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9370974/
https://www.ncbi.nlm.nih.gov/pubmed/35956669
http://dx.doi.org/10.3390/polym14153156
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