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Creep of high polymers
Author(s) -
Williams Malcolm L.,
Howard William H.
Publication year - 1962
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760020113
Subject(s) - creep , crystallite , isothermal process , polymer , materials science , thermodynamics , dispersion (optics) , similarity (geometry) , percolation (cognitive psychology) , coupling (piping) , power law , condensed matter physics , physics , composite material , mathematics , metallurgy , quantum mechanics , computer science , image (mathematics) , statistics , artificial intelligence , neuroscience , biology
For polymers the isothermal creep compliance shows a major dispersion region from the glassy compliance J g to the quasi‐equilibrium compliance J e . Further increases in compliance are associated with viscous flow. There is no detailed molecular mechanism to explain these phenomena although the modified Rouse theory and the postulated entanglement coupling present a reasonable physical concept. To empirically describe the creep curves of polycrystalline metals, a power law ( \documentclass{article}\pagestyle{empty}\begin{document}$ \dot \varepsilon $\end{document} = mt −n ) has frequently been used, where \documentclass{article}\pagestyle{empty}\begin{document}$ \dot \varepsilon $\end{document} is the creep rate, t is the time and m and n are constants with O⩽n⩽. In particular, n equal to 2/3 leads to Andrade creep, a relationship which is applicable to both polymers and metals. A comparison of the creep behavior of polymers and polycrystalline metals shows many points of similarity.