Fatigue limits are classified into three regimes,the first of which corresponds to the conventional fatigue limit of a material while the third regime is related to the threshold value as determined from LEFM type tests; the second region is the transition regime.From this basis the fatigue limits of materials containing small defects (<1 mm) are assessed by invoking the material resistance (R-curve) concept.The results are compared with other methods of assessment for the benefit of designers who have to evaluate the structural integrity of materials containing stress concentrations.
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