Flexural Vibration Damping of Multiple-Layer Plates

Abstract

In the present report the flexural vibration damping of a three-layer composite plate is analyzed for several damping configurations. When homogeneous damping layers are applied on one or both sides of the plate, the damping mechanism is associated with the alternating extensional strain of the visco-elastic damping material. The damping achieved is roughly proportional to the product of the Young's modulus and the square of the thickness of the damping layer. When a stiff layer (foil) covers the damping material, then the damping is associated with the shear motion of this material. The camping is proportional to the stiffness of the foil; but, there is an optimum thickness of the damping layer, which is a function of frequency and temperature for each material. This optimum thickness may be quite small. The theoretical relations can be used to calculate optimum damping treatments for various applications. Experimental results are in gratifying agreement with the calculated values and verify the general validity of the various physical assumptions concerning the damping mechanism.

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Document Details

Document Type
Technical Report
Publication Date
May 26, 1958
Accession Number
AD0162382

Entities

People

  • Donald Ross
  • Edward M. Derwin
  • Ira Dyer

Organizations

  • BBN Technologies

Tags

DTIC Thesaurus Topics

  • Boundary Layer
  • Elastic Materials
  • Elastic Properties
  • Equations
  • Frequency
  • Layers
  • Low Temperature
  • Materials
  • Mechanical Properties
  • Mechanics
  • Modulus Of Elasticity
  • Physical Properties
  • Rigidity
  • Shear Modulus
  • Shear Properties
  • Stiffness
  • Thickness

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  • Structural Dynamics.