X-ray Investigation of Fatigue Damage in Metallic Materials

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Abstract
In the present paper, the authors adopted an X-ray technique to study the fatigue process, and studied the mechanism of fatigue damage and the amount of fatigue damage by observing the variation of the half-value breadth taken from the X-ray patterns which are obtained from variously heat treated carbon steel wires during subjection to stress in rotary bending, and we obtained the following interesting results. (1) The half-value breadth of the X-ray diffraction line is mainly influenced by the variation of micro-stress, and the effect of fragmentation is an influence factor of the second order. (2) The relation between b⁄B (ratio of half-value breadth of the diffraction line) - Log n⁄N (cycle ratio) is expressed by a straight line, and this relation is indepandent of the magnitude of stress applied.

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