Premium
Long‐term stress relaxation behavior of predrawn poly(ethylene terephthalate)
Author(s) -
Hazelwood T.,
Jefferson A. D.,
Lark R. J.,
Gardner D. R.
Publication year - 2014
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.41208
Subject(s) - materials science , poly ethylene , stress relaxation , composite material , shrinkage , ethylene , relaxation (psychology) , stress (linguistics) , work (physics) , composite number , cementitious , creep , thermodynamics , cement , chemistry , psychology , social psychology , biochemistry , linguistics , philosophy , physics , catalysis
Research has been carried out with the aim of better understanding the relevant properties of materials to be used in a new self‐healing cementitious composite material system. In a previous study, the buildup of stress in a heat‐activated restrained predrawn poly(ethylene terephthalate) (PET) specimen was investigated. In the current study, the long‐term stress relaxation behavior of such a restrained specimen has been explored so that its potential for use in the new material system can be better understood. The work includes an experimental study in which the stress in a number of PET specimens, restrained against longitudinal shrinkage, was measured during the initial heat activation and cooling phases, and then monitored for a further 6 months. These data were used to quantify the stress relaxation of the specimen and to inform the development of a new one‐dimensional numerical model to simulate the thermomechanical behavior of this material. This model is shown to be able to reproduce the observed short‐ and long‐term experimental behavior with good accuracy. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 41208.