DTIC ADA117631: Nondestructive Method for Determining Fatigue pdf

DTIC ADA117631: Nondestructive Method for Determining Fatigue

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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

• Creator/s: Defense Technical Information Center
• Date: 7/1/1982
• Year: 1982
• Book Topics/Themes: DTIC Archive, Kramer, I R, RUTGERS – THE STATE UNIV NEW BRUNSWICK N J DEPT OF MECHANICS AND MATERIALS SCIENCE, *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

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