Efforts have been directed toward identifying potential structural materials which can combine high strength and damping characteristic in the audible range. Cobalt-iron alloys with additions of aluminum and manganese, copperaluminum-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. 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 carried out to evaluate the contribution of domains to damping in this alloy. The hull of a one-sixth scale dynamic model of an armoured personnel carrier is being fabricated from a high damping iron-chromium-aluminum for evaluation over a range of vibrational frequencies simulating operation. A torpedo propeller has been cast from a high damping cobalt-iron alloy for evaluation in a simulated vibration test. (Kursetz)
Noise abatement and internal vibrational absorption in potential structural materials
Geraeuschreduzierung und Absorption von inneren Vibrationen bei potentiellen Konstruktionswerkstoffen
US Government Reports ; 1-80
1976
80 Seiten
Report
Englisch
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