Creep of polycarbonate: Experiments and correlation with relaxation

The correctness and reliability of different methods of creep function calculations from relaxation curves were investigated by the computational experiment method. It was shown that an adequate description of some initial (relaxation) curve was not sufficient for the correct determination of the pr...

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Bibliographic Details
Published in:Journal of applied polymer science 1992-05, Vol.45 (2), p.237-244
Main Authors: Malkin, Alexander Ya, Teishev, Albert E., Kutsenko, Michael A.
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Rheology and viscoelasticity
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Summary:The correctness and reliability of different methods of creep function calculations from relaxation curves were investigated by the computational experiment method. It was shown that an adequate description of some initial (relaxation) curve was not sufficient for the correct determination of the proper creep function. The best results can be achieved by the method of expansion of a relaxation curve into the discrete sum of exponents; some other procedures of analytical approximation of relaxation curves can lead to considerable unexpected errors in calculated creep functions. The experiments were done with polycarbonate (PC) in the linear stress range and also at high stresses. The limits of linear viscoelastic behavior were determined.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.1992.070450204