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Creep of polycarbonate: Experiments and correlation with relaxation
Author(s) -
Malkin Alexander Ya.,
Teishev Albert E.,
Kutsenko Michael A.
Publication year - 1992
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.1992.070450204
Subject(s) - creep , viscoelasticity , relaxation (psychology) , stress relaxation , polycarbonate , materials science , function (biology) , range (aeronautics) , stress (linguistics) , thermodynamics , composite material , physics , psychology , social psychology , linguistics , philosophy , evolutionary biology , biology
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.