Accession Number:

AD0270588

Title:

DEVELOPMENT OF DAMPING TREATMENTS FOR NEW CONSTRUCTION SUBMARINES

Descriptive Note:

Corporate Author:

MARE ISLAND NAVAL SHIPYARD VALLEJO CALIF RUBBER LAB

Personal Author(s):

Report Date:

1962-01-18

Pagination or Media Count:

1.0

Abstract:

An investigation was made to determine the damping behavior of specific constrained-layer treatments designed for use on new construction submarines. Each treatment consisted of an aluminum or steel constraining layer and a constrained layer of chromated felt on one or both faces of the steel test bar. The weight of the constraining layers in all treatments was equal to approximately 25 of the weight of the bar. It was concluded that treatment 198 is best for 1-34 inch thick steel plates. It consists of a 1-14 inch thick aluminum constraining layer and a 14 inch thick chromated felt layer fastened to one side only with 12 inch diameter studs spaced 12 inches apart. The nuts on the studs are tightened to 550 inch-pounds torque. Damping is at least 5 of critical over the frequency range of 50 to 1650 cps. This treatment costs approximately 19.00 per square foot to manufacture and install. Treatment 200 is best for 34 inch thick plates. T HIS TREATMENT IS IDENTICAL WITH TREATMENT EXCEPT THAT THE CONSTRAINING LAYER IS INCH THICK ALUMINUM, AND IT YIELDS ESSENTIALLY THE SAME DAMPING. Treatment 200 costs approximately 12.50 per square foot to manufacture and install. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE