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Viscoelastic characterization of high‐density polyethylene membranes under the combined effect of the temperature and the gravity for thermoforming applications
Author(s) -
Ben Aoun N.,
Erchiqui F.,
Mrad H.,
DitubaNgoma G.,
Godard F.
Publication year - 2020
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.25513
Subject(s) - viscoelasticity , thermoforming , materials science , high density polyethylene , viscosity , composite material , arrhenius equation , characterization (materials science) , thermal , silsesquioxane , mechanics , polyethylene , thermodynamics , polymer , classical mechanics , nanotechnology , kinetics , physics
Numerical simulation of the heating stage of thermoplastics in thermoforming requires a good knowledge of the behavior of the materials used. To this end, a study is being conducted on the characterization of the viscoelastic behavior of a circular membrane, made of high‐density polyethylene (HDPE), under the combined effect of temperature and the force of gravity. The experimental tests were carried out in a convection oven for five temperatures (100, 110, 120, 130 and 140°C). For the numerical characterization of the viscoelastic behavior, two viscoelastic models were considered: the classic Kelvin‐Voigt model and the new three‐parameter modified Burger's model (Jeffrey model) that we propose. The mechanical parameters of both models were identified using the Levenberg‐Marquardt algorithm. The thermal‐dependency of the viscosity was characterized by two thermal models: the Arrhenius law and the William‐Landel‐Ferry (WLF) equation.