Viscoelastic behaviour of symmetrical three layer beams

Abstract

Using the theory of linear elasticity, a solution to the torsion problem of the symmetrical three-layer beam is proposed. In this way, the complex torsional stiffness has been determined. The predicted values are then compared with experimental results obtained by mechanical spectroscopy operated in the torsion mode. The shifts in temperature, observed between the loss factor maximum exhibited by the polymers and the sandwiches, respectively, are mainly attributed to a mechanical coupling effect instead of an interphase effect.