Accession Number : ADA191965

Title :   Navy Vehicles: Acoustic Emission Related to Nondestructive Testing

Descriptive Note : Final rept. 1980-87

Corporate Author : CALIFORNIA UNIV LOS ANGELES DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s) : Ono, Kanji

PDF Url : ADA191965

Report Date : 12 Apr 1988

Pagination or Media Count : 16

Abstract : This investigation was aimed at studying acoustic emission for applications to residual stress measurements and for the evaluation of structural integrity of engineering structures. Effects of microstructure, composition and prior cold working on magnetomechanical acoustic emission(MAE) have been studied. Magnetization behavior, magnetostriction and Barkhausen noise are affected by stress as well as other parameters. These responses have been measured simultaneously in order to identify the stress level uniquely. Combinations of advanced signal analysis methods and MAE measurements have been studied to identify the optimum parameters for applications. This work has established mechanisms of MAE signal generation, effects of various parameters that influence the MAE behavior of materials and signal processing techniques that allow materials characterization via MAE. Included are neutron irradiated reactor vessel steels, large size steel plates as well as single crystals of various ferromagnetic metals and alloys. In the second part of this study, acoustic emission from materials undergoing plastic deformation and fracture have been examined in an attempt to improve detection capability of the impending structural failure. Acoustic emission characteristics of reactor vessel steels, advanced aluminum alloys and metal and ceramic matrix composite materials have been evaluated in detail. Keywords: Nondestructive testing; Test and Evaluation; Naval equipment; Reprints.

Descriptors :   *ACOUSTIC EMISSIONS, *MAGNETOSTRICTION, *NAVAL EQUIPMENT, *NONDESTRUCTIVE TESTING, ACOUSTIC PROPERTIES, ALLOYS, ALUMINUM ALLOYS, CERAMIC MATERIALS, COLD WORKING, COMPOSITE MATERIALS, DETECTION, ENGINEERING, FAILURE(MECHANICS), FERROMAGNETIC MATERIALS, MAGNETIZATION, MAGNETOACOUSTICS, MATERIALS, MATRIX MATERIALS, MEASUREMENT, METAL PLATES, METALS, MICROSTRUCTURE, OPTIMIZATION, PARAMETERS, PLASTIC DEFORMATION, RELIABILITY, RESIDUAL STRESS, SIGNAL GENERATION, SIGNAL PROCESSING, SIGNALS, SINGLE CRYSTALS, SIZES(DIMENSIONS), STEEL, STRUCTURAL PROPERTIES, STRUCTURES

Subject Categories : Marine Engineering
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE