Accession Number : ADA295602

Title :   Hysteresis and Acoustic Emission as Non-Destructive Measures of the Fatigue Process in Metals.

Descriptive Note : Final rept. 1 Mar 93-31 Mar 95,

Corporate Author : ILLINOIS INST OF TECH CHICAGO

Personal Author(s) : Guralnick,

PDF Url : ADA295602

Report Date : 31 MAR 1995

Pagination or Media Count : 82

Abstract : Metal fatigue is a result of a cumulative damage process due to repeated cyclic loading which causes premature and unpredictable failure. It is a complicated metallurgical process at the microscopic level which is difficult to accurately explain or model. Despite the complexities, fatigue analysis methods have been developed and are being developed to facilitate fatigue damage assessment and the prediction of fatigue life. This research project is concerned with the behavior of metals subjected to cyclic loading carried to failure. The purpose of this investigation is to develop a relationship between hysteresis loss, hysteresis loop drift, strain amplitudes and the number of cycles to failure; and to correlate this phenomenological description of the fatigue process with mesoscopic observables such as acoustic emission and stress-induced magnetization.(MM)

Descriptors :   *METALS, *STEEL, *FATIGUE(MECHANICS), STRESS STRAIN RELATIONS, NONDESTRUCTIVE TESTING, DAMAGE ASSESSMENT, ELASTIC PROPERTIES, STRAIN(MECHANICS), STRENGTH(MECHANICS), DATA ACQUISITION, PLASTIC PROPERTIES, MAGNETIZATION, FAILURE(MECHANICS), ACOUSTIC EMISSIONS, HYSTERESIS, CYCLIC LOADS.

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE