Accession Number : AD0285217

Title :   DEVELOPMENT OF DAMPING TREATMENTS FOR NEW CONSTRUCTION SUBMARINES

Corporate Author : MARE ISLAND NAVAL SHIPYARD VALLEJO CALIF RUBBER LAB

Personal Author(s) : OSER,JACOB

Report Date : 27 SEP 1962

Pagination or Media Count : 1

Abstract : The development of elastomeric materials to replace chromated felt in constrained-layer treatments for damping heavy plating in new construction submarines is discussed. A new treatment, Treatment 230, was developed which consisted of an aluminum constraining layer 1-1/4 in. thick, and perforated butyl rubber damping layer, 1/16 in. thick, which was made from stock 384-597. The treatment was tested on a 1-3/4 in. thick steel bar. Its weight was 25% of the weight of the bar. Average damping by the new treatment between 50 and 2000 c was 5.8% of critical at 35 F, and 2.6% at 120 F. This treatment was less sensitive to temperature changes between 35 and 120 F than a similar chromated-felt treatment, Treatment 198. It also yielded higher damping than Treatment 198 between 35 and 55 F, and between 100 and 120 F, but lower dampings between 60 and 85 F. At 35 F, the new treatment was fivefold as effective as Treatment 198. (Author)

Descriptors :   *SHIP PLATES, *SUBMARINE HULLS, *SUBMARINES, ALUMINUM, DAMPING, EFFECTIVENESS, MATERIALS, MEASUREMENT, PLASTICS, POLYMERS, RUBBER, STEEL, TEMPERATURE, TEST METHODS, VULCANIZATES

Distribution Statement : APPROVED FOR PUBLIC RELEASE