Accession Number : ADA117631

Title :   Nondestructive Method for Determining Fatigue and Stress-Corrosion Damage.

Descriptive Note : Final rept.,

Corporate Author : RUTGERS - THE STATE UNIV NEW BRUNSWICK N J DEPT OF MECHANICS AND MATERIALS SCIENCE

Personal Author(s) : Kramer,I R ; Weissmann,S

PDF Url : ADA117631

Report Date : Jul 1982

Pagination or Media Count : 22

Abstract : The distribution of dislocations in the surface layer and the interior of fatigued and stress-corrosion damaged specimen was determined by X-ray line broadening techniques. The data indicate that in both cases the dislocation density in the region of the surface is higher than that in the interior initially. With increasing damage the dislocation density in the interior increases rapidly and finally becomes equal to that of the surface. A crack or fracture occurs when this condition is fulfilled. The ratio of the dislocation density in the surface and the interior can provide a measure of the damage caused by fatigue and stress corrosion. Measurements of fatigue and stress-corrosion damage by the X-ray technique agreed closely with the measured damage. (Author)

Descriptors :   *Nondestructive testing, *Fatigue(Mechanics), *Stress corrosion, Aluminum, Silicon, Single crystals, Damage, X ray diffraction, Microstructure, Defects(Materials), Dislocations, Density, Cracking(Fracturing), Unidirectional, Stability, Surface properties, Equations

Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Test Facilities, Equipment and Methods
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE