| Numéro |
J. Phys. Colloques
Volume 48, Numéro C8, Décembre 1987
Fifth European Conference on Internal Friction and Ultrasonic Attenuation in Solids
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|---|---|---|
| Page(s) | C8-3 - C8-13 | |
| DOI | https://doi.org/10.1051/jphyscol:1987801 | |
J. Phys. Colloques 48 (1987) C8-3-C8-13
DOI: 10.1051/jphyscol:1987801
STRESS RELAXATION IN SOLIDS
J. KUBÁT1 et M. RIGDAHL1, 21 Chalmers University of Technology, Department of Polymeric Materials, S-412 96 Gothenburg, Sweden
2 Swedish Pulp and Paper Research Institue, Paper Technology Department, Box 5604, S-114 86 Stockholm, Sweden
Abstract
A cooperative model for stress relaxation is described. It
is based on a two-level system where stimulated emission of phonons may occur
and was formulated in order to circumvent some of the problems encountered with
the theory of stress-dependent thermal activation. The cooperative model also
provides some insight into the well-documented universal similarity in stress
relaxation behaviour among different materials. The dynamic-mechanical response
of the cooperative model is also analyzed in some detail. The experimental
stress relaxation behaviour of composites based on high density polyethylene is
described and it is suggested that the internal stress concept can be a
valuable tool when trying to quantify the effect of fillers and surface
treatments of fillers on the long-term mechanical properties of polymeric
composites.