Accession Number : AD0693497

Title :   AN INVESTIGATION OF THE DAMPING PROPERTIES OF SOME REFRACTORY MATERIALS AT HIGH TEMPERATURES OF VACUUM,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Pysarenko,G. S. ; Bocharova,L. A.

Report Date : 14 JUL 1969

Pagination or Media Count : 7

Abstract : The damping behavior of as-rolled and annealed (1173K for 1 hr) sintered molybdenum, arc-melted niobium, and sintered tungsten. Flat specimens were subjected to vibrations under a stress varying from 200-300 mm/m (superscript 2) in a vacuum at 293-1500K and in air at 293K. The logarithmic decrement of vibrations was used as a criterion of the damping ability. In all the tested materials and at all test temperatures, the decrement increased with increasing stress. The decrement of the tested metals, except molybdenum in the as-rolled condition, increased with increasing test temperature. For almost all the tested metals in the entire range of test temperatures, the values of the decrement on heating differed from those on cooling. At 273K, the damping properties of metals before heating were, as a rule, slightly higher than after heating. The magnitudes of the decrement in vacuum and in air at 273K differed by 6-8 percent, with the difference decreasing as the decrement increased. At all test temperatures, refractory metals had a higher decrement of vibrations than the most heat-resistant nickel-base alloys. Satisfactory damping properties combined with a high endurance limit (as compared with heat-resistant alloys) in the wide temperature range make promising structural materials in various fields of modern indus. (Author)

Descriptors :   (*REFRACTORY METALS, DAMPING), MOLYBDENUM, TUNGSTEN, NIOBIUM, VIBRATION, USSR

Subject Categories : Metallurgy and Metallography
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE