A rheological Newton model submitted to a cyclic parabolic stress

Abstract

The rheological Newton model of the perfectly viscous materials subjected to a cyclic pa­ rabolic stress is studied. The strain-time law is ondulatory and the inflexion points define a straight line passing at the origin. This straight line corresponds to the stationary creep of the Newton model subjected to a stress equal to the average value of the parabolic stress. When the semi-period of the applied stress tends to zero the strain tends to the referred stationary creep.