Accession Number : AD0787361

Title :   A Study of the Influence of Stress and Temperature on the Damping Capacity of Mn-Cu Alloys for Ship Silencing Applications.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Hills,Norman Anthony

Report Date : SEP 1974

Pagination or Media Count : 102

Abstract : Mn-Cu alloys develop a high damping capacity after a heat treatment of aging and subsequent quenching. The damping capacity developed is extremely sensitive to aging time at a given temperature or temperature for a fixed time. The effect of stress applied during the heat treatment of the commercial alloy Incramute is significant. A tensile load precludes the development of high damping capacity for the aging times investigated (up to 50 hours in some cases). A compressive load only increases the time required to achieve the maximum damping capacity. A preliminary study of the effect of stress applied during heat treatment of Incramute indicates that the major disruption to development of high damping capacity occurs during the aging portion of the heat treatment. (Modified author abstract)

Descriptors :   *Manganese alloys, *Copper alloys, *Damping, *Vibration, Heat treatment, Aging(Materials), Stresses, Recrystallization, Grain size, Fatigue(Mechanics), Loads(Forces), Ship noise, Noise reduction, Submarines, Theses

Subject Categories : Metallurgy and Metallography
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE