Damping Characteristic of Adhesive Sandwiched Beams and Their Application to Boring Bars

Abstract

Vibrational damping characteristics of beams, which are made of steel plates sandwiching epoxy based adhesive and visco-elastic material, are examined theoretically and experimentally. The damping characteristics of the sandwich beams change with variation of the beam dimensions and the properties of sandwiched adhesive. For example, when epoxy adhesive is used, the damping ratio of the beam becomes higher as the adhesive layer gets thicker and the resonant frequency of the beam is higher. And it becomes clear that the high damping beams can be obtained by using adhesive with suitable properties and controlling adhesive thickness.In addition, the sandwich structure is applied to boring bars, and excellent damping tools are obtained.