eprintid: 10196705
rev_number: 11
eprint_status: archive
userid: 699
dir: disk0/10/19/67/05
datestamp: 2024-09-09 09:24:25
lastmod: 2024-09-09 09:24:25
status_changed: 2024-09-09 09:24:25
type: article
metadata_visibility: show
sword_depositor: 699
creators_name: Comitti, Alessandro
creators_name: Bosi, Federico
title: Thermomechanical characterisation and plane stress linear viscoelastic modelling of ethylene-tetra-fluoroethylene foils
ispublished: inpress
divisions: UCL
divisions: B04
divisions: F45
keywords: Lightweight materials, Membrane structures, Viscoelasticity, Polymers, Time-temperature superposition principle, Thin films
note: © 2024 Springer Nature. This article is licensed under a Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/).
abstract: Ethylene-tetra-fluoroethylene (ETFE) is a polymer employed in tension membrane structures with mechanical properties that strongly depend on time and temperature effects. A comprehensive understanding of the mutual influence of these variables and a unified viscoelastic constitutive model design can enable wider exploitation of ETFE in sustainable lightweight construction. This study presents a thermomechanical characterisation of ETFE foils through quasi-static tensile experiments spanning two orders of magnitude of strain rates, creep, relaxation, shear and dynamic cyclic tests in a wide range of temperatures suitable for building applications, from -20 Celsius degrees to 60 Celsius degrees. The experimental results in different material orientations are used to identify the limits of the linear viscoelastic domain, define the direction-dependent creep compliance master curves and calibrate the parameters of a plane stress orthotropic linear viscoelastic model, employing the Boltzmann superposition and the time-temperature superposition principles. The model has been numerically implemented using a recursive integration algorithm and its code is provided open source. A validation on independently acquired data shows the accuracy of the constitutive model in predicting ETFE behaviour within the linear viscoelastic regime usually adopted during structural design, with excellent extrapolation capabilities outside the range of the calibration data.
date: 2024-08-28
date_type: published
publisher: SPRINGER
official_url: http://dx.doi.org/10.1007/s11043-024-09704-5
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 2310302
doi: 10.1007/s11043-024-09704-5
lyricists_name: Comitti, Alessandro
lyricists_id: ACOMI67
actors_name: Comitti, Alessandro
actors_id: ACOMI67
actors_role: owner
funding_acknowledgements: H2020-MSCA-ITN-2020-LIGHTEN-956547 [European Union]
full_text_status: public
publication: Mechanics of Time-Dependent Materials
pages: 28
citation:        Comitti, Alessandro;    Bosi, Federico;      (2024)    Thermomechanical characterisation and plane stress linear viscoelastic modelling of ethylene-tetra-fluoroethylene foils.                   Mechanics of Time-Dependent Materials        10.1007/s11043-024-09704-5 <https://doi.org/10.1007/s11043-024-09704-5>.    (In press).    Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10196705/3/Comitti_Thermomechanical%20characterisation%20and%20plane%20stress%20linear%20viscoelastic%20modelling%20of%20ethylene-tetra-fluoroethylene%20foils_AOP.pdf