Thermomechanically consistent formulations of the standard linear solid using fractional derivatives

• Autorzy: Lion A.
• Języki publikacji: EN

Abstrakty

EN

We study the thermomechanical properties of a frequently used fractional generalisation of the standard linear solid. Its mathematical structure arises from an ordinary linear differential equation between stress and strain when replacing the first order time rates by fractional derivatives of the order .... If the parameters ... and ... are not further restricted, the model leads to an unphysical behaviour. In the case of harmonic deformations the dissipation modulus can become negative. This corresponds to a negative entropy production and violates the second law of thermodynamics. Then we propose two generalisations of the standard linear solid which are based on a so-called thermodynamically consistent fractional rheological element. It possesses a non-negative free energy and rate of dissipation for arbitrary deformation processes and is compatible with the second law of thermodynamics. The differential equations between stress and strain of the proposed generalisations contain also fractional derivatives of different orders but both the dynamic moduli and the relaxation spectra are non-negative functions of their arguments. No restrictions on the material parameters are required.

Słowa kluczowe

EN

thermomechanical properties; linear solid; second law of thermodynamics; thermodynamically consistent fractional rheological element

PL

własności termomechaniczne; liniowe ciała stałe; drugie prawo termodynamiki

• Wydawca: Instytut Podstawowych Problemów Techniki PAN
• Czasopismo: Archives of Mechanics
• Rocznik: 2001
• Tom: Vol. 53, nr 3
• Strony: 253--273
• Opis fizyczny: Bibliogr. 21poz.

Twórcy

autor

Lion A.

• Institute of Mechanics, University of Kassel, D-34109 Kassel, Monchebergstrasse 7