VISCOELASTIC BEHAVIOR OF SYMMETRICAL 3-LAYER BEAMS

Using the theory of linear elasticity, a solution to the torsion probl em of the symmetrical three-layer beam is proposed. In this way, the c omplex torsional stiffness has been determined. The predicted values a re then compared with experimental results obtained by mechanical spec troscopy operated in the torsion mode. The shifts in temperature, obse rved between the loss factor maximum exhibited by the polymers and the sandwiches, respectively, are mainly attributed to a mechanical coupl ing effect instead of an interphase effect.