Shrinkage and creep are the inherent time-dependent characters of concrete which belongs to a viscoelastic material.

This paper applies linear viscoelastic theory to study on the creep and relaxation phenomena and to verify the relaxation behavior through several stress relaxation experiments.

In this paper, the viscoelastic constitutive equation, the hysteresis, the stresses relaxation and creep of the materials of the articular disc and two kinds of artificial articular disc are analysed.