Abstract
The use of engineering materials in critical applications necessitates the accurate prediction of component lifetime for inspection and renewal purposes. In a cyclic loading situations, it is very important to be able to predict the growth rates of cracks from initiation to final fracture. Most of the investigations have been focused on the long fatigue cracks from the notched specimens, and linear elastic fracture mechanics is used to analyse the crack growth data. The behaviour of the short fatigue cracks less than a millimeter in length (short cracks) cannot be analysed by linear elastic methods because of large-scale plasticity effects. A number of modification to LEFM and new models have been introduced to correlate the behaviour of long and short fatigue cracks. This paper addresses the critical view of the modifications and some of the models proposed for the analysis of short fatigue cracks.
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