Accession Number : ADA323829

Title :   High Damping Structural Materials.

Descriptive Note : Final rept.,

Corporate Author : NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD

Personal Author(s) : Wong, Catherine R.

PDF Url : ADA323829

Report Date : JAN 1997

Pagination or Media Count : 57

Abstract : Damping capacity measurements on aluminum foam filled with epoxy confirmed previous finite element analysis which showed that a smaller phase size leads to lower damping. Studies of high temperature alloys in the Ti-Sn system based on the intermetallic compound Ti3Sn have identified high damping alloys. The low frequency damping behavior shows loss factors as high as 0.04 at room temperature. The damping is a function of temperature and frequency but does not vary much with strain. Zirconium and erbium modified Cu-Mn-Al was spray formed in an effort to increase homogeneity and damping capacity and decrease impurity levels. Although the microstructure revealed that the optimum spray forming parameters have not yet been achieved, the modified alloys showed both high damping and resistance to losing that damping capacity over time. The elemental additions also accelerated the formation of alpha manganese at the grain boundaries during aging.

Descriptors :   *ALUMINUM ALLOYS, *DAMPING, *TITANIUM ALLOYS, STRESS STRAIN RELATIONS, VIBRATION, MICROSTRUCTURE, AGING(MATERIALS), HIGH TEMPERATURE, FINITE ELEMENT ANALYSIS, STRUCTURAL ANALYSIS, COPPER ALLOYS, EPOXY COMPOSITES, ALUMINUM INTERMETALLICS, GRAIN BOUNDARIES, METALLOGRAPHY, HEAT RESISTANT ALLOYS, MANGANESE ALLOYS, TIN ALLOYS.

Subject Categories : Properties of Metals and Alloys
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE