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Long-term stress relaxation behavior of predrawn poly(ethylene terephthalate)

Hazelwood, Tobias, Jefferson, Anthony Duncan, Lark, Robert John and Gardner, Diane Ruth 2014. Long-term stress relaxation behavior of predrawn poly(ethylene terephthalate). Journal of Applied Polymer Science 131 (23) , 41208. 10.1002/app.41208

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Abstract

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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Additional Information: First published online 24th July 2014. PDF uploaded in accordance with publisher's policies at http://www.sherpa.ac.uk/romeo/issn/0021-8995/ (accessed 5.2.16).
Publisher: Wiley-Blackwell
ISSN: 0021-8995
Date of Acceptance: 23 June 2014
Last Modified: 29 Jun 2019 02:11
URI: http://orca.cf.ac.uk/id/eprint/66815

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