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Application of a necking criterion to PET fibers in tension

✍ Scribed by J. Sweeney; H. Shirataki; A. P. Unwin; I. M. Ward

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
225 KB
Volume
74
Category
Article
ISSN
0021-8995

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✦ Synopsis

A criterion to predict instability in rate-dependent materials is developed. It is implemented for PET fibers in tension at three temperatures: 60, 75, and 80Β°C. At 60Β°C, necking is always observed, whereas at 80Β°C, the deformation is uniform, and 75Β°C marks a transition region, where necking is observed only at higher speeds and the deformation is otherwise uniform. As a necessary tool in the implementation of this criterion, the stress-strain behavior of PET is modeled using a combination of an Eyring process, a Gaussian network, and a linear elastic element. The resulting instability model gives predictions that are generally consistent with the experimental observations at all temperatures.

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