Modelling tensile force oscillation during the tensile test of PET specimens

Force oscillation occurring during the tensile testing of poly(ethylene terephthalate) (PET), resulting in periodical cavitation of the test specimens, has been studied. A mathematical model has been developed to describe the phenomenon, wherein special fibre bundles are assigned to the amorphous mo...

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Bibliographic Details
Published inExpress polymer letters Vol. 3; no. 2; pp. 63 - 69
Main Authors Vas, L. M., Ronkay, F., Czigany, T.
Format Journal Article
LanguageEnglish
Published Budapest University of Technology 01.02.2009
Subjects
Modeling and simulation
stress oscillation
viscoelastic properties
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Summary:Force oscillation occurring during the tensile testing of poly(ethylene terephthalate) (PET), resulting in periodical cavitation of the test specimens, has been studied. A mathematical model has been developed to describe the phenomenon, wherein special fibre bundles are assigned to the amorphous molecular chains. In order to model the local periodical transformations and the rate dependent viscoelastic behaviour the coupled fibre bundle cells were supplemented with a twoelement Maxwell model. Using the parameters determined from the measurements the model was compared to the measured force-elongation diagrams and it has been concluded that the simple model can be well used to describe the phenomenon.
ISSN:1788-618X
1788-618X
DOI:10.3144/expresspolymlett.2009.10