Accession Number : ADA329552

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

Descriptive Note : Final rept. 1 Apr 95-31 May 97,

Corporate Author : ILLINOIS INST OF TECH CHICAGO

Personal Author(s) : Guralnick, S. A.

PDF Url : ADA329552

Report Date : 31 MAY 1997

Pagination or Media Count : 76

Abstract : Piezomagnetic effects are due to interactions between the mechanical and magnetic mesostructure of materials. In particular, under repeated loading cycles, microplastic processes generate dislocations and modify the texture of grains, voids, inclusions, and other defects. These mechanical changes in turn alter the arrangement of the coextensive ferromagnetic domain structure and affect the intensity of the associated magnetic fields.

Descriptors :   *METALS, *FATIGUE(MECHANICS), *ACOUSTIC EMISSIONS, MAGNETIC FIELDS, MECHANICAL PROPERTIES, NONDESTRUCTIVE TESTING, CYCLES, INCLUSIONS, DISLOCATIONS, HYSTERESIS, FERROMAGNETIC MATERIALS.

Subject Categories : Test Facilities, Equipment and Methods
      Electricity and Magnetism
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE