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JOURNAL OF POLYMER ENGINEERING Vol. 21, No. 6, 2001, page 489 A LATCH-BASED WEIBULL MODEL FOR POLYMERIC CREEP AND RECOVERY Kevin S. Fancey Department of Engineering, University of Hull Hull
HU6 7RX, United Kingdom Abstract
A model to represent creep and recovery in polymeric materials is
described. This is based on the Weibull distribution function, which is commonly
used for representing the failure of elements in mechanical systems. A
mechanical representation of viscoelasticity is discussed, in which viscoelastic
response is described by the action of time-dependent latch elements. By
analysing experimental data on nylon 6,6, polypropylene and
polyether-ether-ketone (PEEK) from a range of sources, it is shown that creep
and non-elastic recovery can be represented by two equations, each containing
four parameters. The model correlates well with the experimental data analysed,
from which it can be used to predict both time-dependent and time-independent
strain. Keywords: Creep, recovery, viscoelasticity, Weibull.
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