Published online by Cambridge University Press: 06 March 2019
The development of materials with optimum fatigue characteristics hinges on a better understanding of the fatigue mechanism ( i .e ., fatigue crack nucleation and propagation) under specific loading conditions. A correlation was established between the residual macroscopic stress level--as measured by x-ray diffraction analysis, the fatigue damage in the form of slip-band formation and intensification, and the fatigue life at various applied stress levels of pure iron and low-carbon steel.
Residual stresses were measured by an automated diffractometer technique (Fe 211 Kα reflection, Cr radiation) and computer calculation of both macroscopic (line shift) and microscopic (line broadening) stresses . Surface fatigue damage was observed by optical microscopy.