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Modelling of thermo‐viscoelastic material behaviour of polyurethane close to the glass transition temperature
Author(s) -
Johlitz M.,
Scharding D.,
Diebels S.,
Retka J.,
Lion A.
Publication year - 2010
Publication title -
zamm ‐ journal of applied mathematics and mechanics / zeitschrift für angewandte mathematik und mechanik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.449
H-Index - 51
eISSN - 1521-4001
pISSN - 0044-2267
DOI - 10.1002/zamm.200900361
Subject(s) - viscoelasticity , materials science , glass transition , compressibility , ansatz , composite material , elastomer , relaxation (psychology) , rheology , thermodynamics , polymer , physics , psychology , social psychology , quantum mechanics
In this contribution a viscoelastic elastomer is examined with respect to its thermo‐mechanical behaviour. Therefore uniaxial tension tests and relaxation tests are performed at different constant temperatures up to the glass transition region. Hence an experimental data pool is provided. On the theoretical side a finite viscoelastic and incompressible material model is used and enhanced by temperature dependency in order to model the experimentally observed effects. The material parameters are strategically identified by means of biologic evolution strategies. Thereby it turned out that the investigated material cannot be modelled as a thermo‐rheologically simple material. Quite the contrary, a new ansatz is chosen.