ISSN:
0032-3888
Schlagwort(e):
Chemistry
;
Chemical Engineering
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Maschinenbau
,
Physik
Notizen:
For polymers the isothermal creep compliance shows a major dispersion region from the glassy compliance Jg to the quasi-equilibrium compliance Je. 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.
Zusätzliches Material:
13 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/pen.760020113
