Torsional Stress Analysis and Vibration Damping of Three-Layered Rods : Characterization of Nonsymmetrical Sandwich Rod and Covered Rod

概要

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A torsional stress analysis and the expressions of torsional rigidity for the two types of nonsymmetrical three-layered rectangular rods such as sandwich rods with a viscoelastic core and covered rods having composition opposite to that of the sandwich rods, have been presented. The composite loss factors for these rods in torsional systems are also considered. The expressions of shear stress and torsional rigidity presented are briefly fonmulated and may be easily applicable to various two- and three-layered rods. Numerical results are discussed for typical sandwich rods and covered ones, and also those having geometrically similar compositions. These results decribe how to consider the suitable rod composition in order to reduce the maximum shear stress arising at the interfaces between the layers. Also, they indicate a remarkable difference of the damping characteristics between the symmetrical sandwich rod and the covered one such that the latter holds geometrical similarity, but the former does not presenting instead, an optimal rod composition. Therefore, it was clarified that the damping capacity of the symmetrical sandwich rod may be reduced if the viscoelastic core layer thickness exceeds its optimum.
一般社団法人日本機械学会の論文
1990-04-15