Abstract
Long-range, elastic strains emanating from stress raisers, such as notches, holes and inclusions were investigated in bent silicon crystals which functioned as a model material. The strains and strain interactions were characterized by x-ray pendellosung fringe topography and were quantitatively evaluated by x-ray intensity measurements of traverse-oscillation topographs. The experimental results were compared to calculations based on continuum mechanics and satisfactory agreement was obtained. The x-ray analysis of long-range plastic strains and deformation gradients in technological polycrystalline materials by a computer-aided rocking curve analyzer (CARCA) was described. It was shown how CARCA can be used in alloys to obtain aggregate information of the defect structure of a large grain population and to isolate regions of intense deformation. Applications of the method were given to determine prefracture damage in fatigued and corrosion fatigued aluminum alloys and in stress corroded steel.
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