Eur. Phys. J. AP 6, 229-235 (1999)
https://doi.org/10.1051/epjap:1999177

Thermodynamic modeling of creep mechanical behaviour by non linear relaxations

¹ Laboratoire de Science et Génie des Surfaces (UMR 7570 du CNRS), École Européenne d'Ingénieur en Génie des Matériaux, 6 rue Bastien Lepage, B.P. 630, 54010 Nancy Cedex, France
² Laboratoire d'Énergétique et de Mécanique Théorique et Appliquée (UMR 7563 du CNRS), École Nationale Supérieure d'Électricité et de Mécanique, 2 avenue de la forêt de Haye, B.P. 160, 54500 Vandœuvre, France

Corresponding author: ayadi@eeigm.u-nancy.fr

Received: 9 October 1998
Revised: 6 January 1999
Accepted: 23 February 1999
Published online: 15 June 1999

Abstract

For some years, Cunat [1] has developed a formalism based on the thermodynamics of irreversible processes in order to describe the behaviour of continuous media which are not in the equilibrium state. This thermodynamics of relaxation has led to a very general modeling called “Distribution of Non-Linear Relaxations” (DNLR) modeling. This theoretical approach is currently applied in solid mechanics for various ways and sequences of loading. In this paper, the application to primary and secondary unidirectional creep is presented. Only five parameters whose physical meaning is known are necessary. We analyze the role of each of them and indicate a process of identification from experimental data.