Effect of size and stress gradient on fatigue behaviour

Effect of geometric size deviation induced by machining on the vibration fatigue behavior of Ti‐6Al‐4V

“…The crack initiation mechanism of Ti-6Al-4V has attracted the interest of researchers, and it is now known that many factors, such as the surface roughness, 11 stress ratio, [12][13][14] stress gradient, 15,16 and frequency, 13,17,18 can affect crack initiation and fatigue behavior. Although many experimental works have been carried out, there are still several questions to be resolved, including the excitation frequency effect on the fatigue life.…”

“…To examine the nonideal geometry effects of a reduced section, the fatigue strength variability is investigated in high‐cycle vibration fatigue. Waryoba and Mshana 16 showed through numerical and analytical analyses that the fatigue strength increases with stress gradient, regardless of specimen size and method of loading. We know that the geometric deviation leads to a stress concentration variation, but it is not easy to examine its effect because of the numerous interactions between the parameters that affect the fatigue behavior of the specimens.…”

Evaluation of notch size effect on LCF life of TA19 specimens based on the stress gradient modified critical distance method

“…Fatigue crack initiation is dependent on the average stress over a length, area or volume, and the stress gradient. [13][14][15][16] 3. The volume of material subjected to the elevated stress is related to the stress gradient in the vicinity of a notch.…”