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IASS 2016 Tokyo Symposium: Spatial Structures in the 21st Century


IASS Symposium 2016

SESSION: Tension & Membrane Structures

Viscous characteristics of ETFE film sheet under bi-axial tensions with unequal stress ratios

< Table of Contents for Tension & Membrane Structures
  • Proceedings Name: IASS 2016 Tokyo Symposium: Spatial Structures in the 21st Century
  • ISSN: (Electronic Version) 2518-6582
  • Session: Tension & Membrane Structures
  • Pages: 10
  • Title: Viscous characteristics of ETFE film sheet under bi-axial tensions with unequal stress ratios
  • Author(s): Tatsuya Yoshino, Shiro Kato
  • Keywords: membrane structures, ETFE film, visco-elastic, constitutive equations, FEM
Abstract
This study aims at clarifying the behavior of ETFE film sheet under unequal bi-axial stresses based on both FEM analysis and experiment. The study discussed both tensile and visco-elastic deformation under equal biaxial tensions, and the first author proposed the nonlinear incremental visco-elastic constitutive equations.The present paper focuses on the experimental and numerical studies for creep tests. First, the creep tests under unequal biaxial tensions are performed for several stress ratios: (1:0), (5:1) and (2:1). With emphasis on equal stress ratio, comparison is performed for the maximum stresses of 6 and 9MPa, followed by identification of Poisson's ratio for stress ratio (1:0). Secondly, the numerical simulations for the creep tests are performed, where the nonlinear incremental visco-elastic constitutive equations are applied. Comparing the experimental results with the simulated results, the validity of the proposed constitutive equations is finally confirmed.

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