抄録
Experimental evaluation of the torsional rigidities and loss factors of a sandwich rod and a covered rod having a viscoelastic core and viscoelastic covered layers, respectively, are carried out in order to verify the analysis results previously presented. The experimental results are discussed for typical nonsylnmetrical rods with the same total thickness of the outer layers and also symmetrical rods with the geometrically similar thicknesses. The damping characteristics of the sandwich rod and the covered one present remarkably different features. These characteristics are given by the experimental and analytical results. Furthermore, the optimal temperature showing the highest loss factor of the sandwich rod usually differs from the glass transition temperature of the viscoelastic core material. Such a difference results in less damping capacity of the rod. A strain energy analysis and the experimental results explain that the arrangement of the core layer thickness enables minimization of such a difference, if the properties of the core material are previously known.
