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Investigating the Time Dependent Behavior of Thermoplastic Polymers under Tensile Load
Author(s) -
Vas László Mihály,
Nagy Péter
Publication year - 2006
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200690094
Subject(s) - viscoelasticity , materials science , ultimate tensile strength , nonlinear system , relaxation (psychology) , polypropylene , composite material , stress relaxation , tensile testing , polymer , stress (linguistics) , creep , physics , psychology , social psychology , linguistics , philosophy , quantum mechanics
The relationship between the results of the tensile and the stress relaxation tests of polypropylene specimens were analyzed and an attempt was made to find a way to estimate the former from the latter based on the measurements and the theory of linear viscoelasticity. The mechanical response of real polymers are basically of nonlinear character, therefore their behavior patterns do not meet the idealized (linear) ones. Experiments were performed on poly(propylene) (PP) as a test material and the stress relaxation behavior, as well as the linear elastic and linear viscoelastic approximation of the tensile load‐time curve were analyzed. To demonstrate the applicability of our idea and to perform the numerical calculations we have chosen a flexible function with three parameters to realize the nonlinear behavior.