Stress intensity factor solutions for fretting fatigue using stress gradient factor

Predicting fretting fatigue in engineering design

“…Recently, researchers have put effort into systematising stress intensity factor computations for fretting fatigue [129,130,131].…”

“…As noted recently by Antunes et al [129], there is lack of general expressions for stress intensity factors for cracks originating from bodies in contact under fretting conditions, and they seek to relieve this deficiency. They argue that a problem with CLNA method and analytical SIF in general, is neglecting non-linear effects.…”

Modelling the fretting fatigue crack growth: From short crack correction strategies to microstructural approaches

“…Fretting fatigue crack prediction requires non-local multiaxial fatigue criteria to capture the stress gradient and complex state imposed by the contact loading [8][9][10][11]. In order to model the crack growth propagation, LEFM approach under mixed mode loading conditions is usually considered.…”

Plastic Stress Concentration Effects in Fatigue Strength

“…The non-propagating short-crack approach is mechanically sounder than other approaches based on stress averages computed ahead of the notch tip. Antunes, et al [26] have suggested that the use of Stress Gradient Factors (SGF) to modify appropriately the SIFs of short cracks that depart from notch tips indicates that any critical distance is related to these SIFs and not to material size parameters, like the grain size for instance. Notch sensitivity should be renamed stress gradient sensitivity to consider similar behaviors in fretting, residual stress fields in welds, and other critical point types associated with significant stress gradients.…”

“…If the SIF of a crack that departs from a notch tip becomes smaller than the FCG threshold, the crack stops. This is why the fatigue SCF 𝐾 𝑓 can (and should) be modeled as a short crack propagation problem [14,26,33,[42][43][44][45][46][47][48].…”