Abstract
It has been said that 80%–90% of fracture accidents are caused by fatigue. Investigation indicates that almost 100% of these fractures start from the sites of stress concentrations at structural discontinuities such as holes, notches, shoulders, cracks, defects, and scratches. Stresses at structural discontinuities are higher than at other places on structures because of stress concentration. The phenomenon of decrease in fatigue strength, due to stress concentration, is called the ‘notch effect’. The relationship between stress concentration, and the size and shape of holes and notches must be correctly understood for correct understanding of the notch effect phenomenon.
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