ENGLISH

Viscoelastic relaxation functions compatible with thermodynamics

By Mauro Fabrizio , A. Morro

Book information

Publisher
Pergamon Press Inc.
Year
1985
DOI
10.1007/BF00041695
Language
english
Format
PDF
Filesize
201 kB (205764 bytes)
Pages
5\5
Topic
Technique
Time added
2016-11-01 16:36:33

Description

Within the framework of linear viscoelasticity this paper deals with the elaboration of a procedure for testing whether a given relaxation function is compatible with thermodynamics. In order to avoid any difficulty concerning the indeterminacy of the free energy functional, the second law is stated through the Clausius property for approximately-cyclic processes. Then, by considering sinusoidal strain tensor evolutions, it is shown that the statement of the second law is equivalent to a condition which, in essence, expresses the non-negativeness of the loss modulus. This means that, in order to test for compatibility with thermodynamics, it is enough to examine what happens in sinusoidal processes.

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