Noise Abatement and Internal Vibrational Absorption in Potential Structural Materials
Abstract
Efforts have been directed toward identifying potential structural materials which can combine high strength and damping characteristics in the audible range. Cobalt-iron alloys with additions of aluminum and manganese, copper-aluminum-nickel alloys, iron-chromium-aluminum alloys, titanium-nickel alloys, and several commercial steel compositions have been investigated. The range of yield strengths and loss factors which are attainable exceed currently available commercial materials. A survey of potential applications of high damping alloys to military systems was conducted. Three potential areas which merit consideration include body panels of military reconnaissance vehicles, motor covers and ship propellers. Plans to fabricate body panels for a 1/6 scale dynamic model of an armoured personnel carrier have been made. Measurements of the enthalpy of transformation in a thermoelastic Cu-Al-Ni alloy has been conducted over a range of grain size and sample size to assess the stored elastic strain energy. Studies of the magnetic domain wall configuration in a cobalt-iron alloy have been initialed to evaluate the contribution of domains to damping in this alloy.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1976
- Accession Number
- ADA107745
Entities
People
- L. Kaufman
- P. P. Neshe
- S. A. Kulin