Accession Number : ADA305266

Title :   An Experimental Investigation of the Damping Contribution of an Elastometric Ablator on Aluminum Beams.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

Personal Author(s) : Howell, William E.

PDF Url : ADA305266

Report Date : APR 1974

Pagination or Media Count : 24

Abstract : Damping results are presented for an elastomeric ablation material bonded to an aluminum alloy substrate. Tests were conducted on aluminum beams 0.159, 0.318, and 0.476 cm thick, with and without an ablator. Ablation-material thickness varied from 0.159 to 0.953 cm. Comparative damping data were obtained by using variations of the free-free beam technique with strain gages and piezoelectric transducers. Of the two test arrangements employed, the technique using strain gages produced results that indicated less restraint of the beams. Ablation material, in thicknesses less than 1 cm, substantially increased the damping parameter of the aluminum beams. (MM)

Descriptors :   *REENTRY VEHICLES, *ALUMINUM ALLOYS, *COMPOSITE MATERIALS, *ELASTOMERS, *HEAT SHIELDS, *ABLATIVE MATERIALS, SPACECRAFT, BEAMS(STRUCTURAL), VISCOELASTICITY, DAMPING, SUBSTRATES, STRAIN GAGES, BONDING, PIEZOELECTRIC TRANSDUCERS.

Subject Categories : Laminates and Composite Materials
      Properties of Metals and Alloys
      Elastomers and Rubber
      Unmanned Spacecraft
      Manned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE