Accession Number : AD0727027

Title :   Damping Additions for Plates Using Constrained Viscoelastic Layers.

Descriptive Note : Technical rept.,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Torvik,Peter J. ; Strickland,Daniel Z.

Report Date : MAY 1971

Pagination or Media Count : 40

Abstract : An analysis is given for a damping addition employing several thin viscoelastic sheets and thin metallic layers. The damping layers are alternated with the constraining layers, which are segmented and are not anchored to the base plate. The effectiveness of such additions in increasing the damping of thin simply supported square plates is evaluated and methods for optimizing the design are considered. An experimental investigation of the effectiveness of such damping additions is also reported. Additions weighing a few per cent of the weight of the base plate were found to produce substantial increases in the damping of the system. A non-optimal design was found to produce less, but still substantial damping. Two other damping additions were constructed and tested. These, which employ multiple layers with constraining layers anchored to the base plate, were not optimized, but did produce significant damping. (Author)

Descriptors :   (*SANDWICH CONSTRUCTION, VIBRATION), DAMPING, RESONANT FREQUENCY, VISCOELASTICITY, SHEAR STRESSES, STRAIN(MECHANICS), EXPERIMENTAL DATA

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE