Modelling of mechanical behavior of nickel alloy using a thermodynamics approach to continuous media relaxation

The high-temperature behaviour of a Nickel alloy submitted to uniaxial tension, relaxation and creep, is analysed using a thermodynamics approach to non-linear relaxations. The model is essentially based on a distribution of the dissipation processes obtained by the theory of fluctuations. The agreement between experiment and simulations requires the use of four parameters. These parameters depend on the elastic properties of the alloy and also on the thermal activation necessary for mobility defects. We present a comparison. with the classical model of Chaboche including a recovery term in the potential of dissipation. (C) Academie des Sciences/Elsevier, Paris.