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Thermoforming of a PMMA transparency near glass transition temperature
Author(s) -
Gilormini Pierre,
Chevalier Luc,
Régnier Gilles
Publication year - 2010
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.21728
Subject(s) - thermoforming , materials science , viscoelasticity , glass transition , transparency (behavior) , composite material , relaxation (psychology) , nonlinear system , constitutive equation , finite element method , thermodynamics , computer science , polymer , physics , psychology , social psychology , quantum mechanics , computer security
To simulate the thermoforming of a transparency, constitutive equations are proposed for the nonlinear viscoelastic behavior of poly(methyl methacrylate) near glass transition temperature, which include large deformations. In a first step, they are fitted on a set of uniaxial tension‐relaxation tests at various strain levels and strain rates. In a second step, their implementation in a finite element code is performed. Finally, the thermoforming of a transparency at a constant and uniform temperature is simulated and compared with experimental results. POLYM. ENG. SCI., 50:2004–2012, 2010. © 2010 Society of Plastics Engineers