A fracture mechanics-based approach to estimating the endurance limit of notched components

Experimental determination and sensitivity analysis of the fatigue critical distance obtained with rounded V-notched specimens

“…A reliable fatigue prognosis necessitates robust notch fatigue assessment methods, as almost any machine element contains geometrical details resulting in stress concentration effects. Among various methods proposed in the past [1,2,3,4] to deal with notch fatigue calculation, the Theory of Critical Distances (TCD), originally devised by Neuber [5] and Peterson [6] in the 50's of the past century, has experienced a new golden age in the last two decades [7]. The theory has been successfully applied to predict high to medium-cycle fatigue [8,9], also in the presence of residual stresses [10,11,12], multiaxial and variable amplitude fatigue [13], fretting fatigue [14,15,16], fatigue of welded joints [17], and even static brittle fracture [18].…”

“…The former approach is known as the Point Method (PM), the latter methods consider averaging domains of different dimensionality [7,19]. Among them, the most common is the Line Method (LM), which proved to yield more accurate estimations in comparison with methods considering averaging domains of higher geometrical complexity [3].…”

Statistical significance of notch fatigue prognoses based on the strain-energy–density method: Application to conventionally and additively manufactured materials

“…The most popular notch fatigue design criteria are based on the definition of a notch sensitivity factor [1] or notch support factor related to the slope of the stress gradient emanating from the stress peak location [2]. More sophisticated fracture mechanics approaches attempt to incorporate also the fatigue life spent to propagate the crack initiated in the critical fatigue location until eventual failure [3,4]. Neuber [5] and…”