PSI - Issue 39

Slobodanka Boljanović et al. / Procedia Structural Integrity 39 (2022) 624 – 631

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Slobodanka Boljanović et al. / Structural Integrity Procedia 39 (2022) 624 – 631

Table 1. Evaluated fatigue life and corresponding applied maximum stresses ( R = 0 and -1). Experiments are those by Grover et al. (1953). Relevant calculations are the present outcomes ( N cal ) and also those discussed by Boljanović and Carpinteri ( 2020, N cal. *). S max (MPa) R N cal. * (cycles) N cal. (cycles) N exp. (cycles) 342.55 0 38,680 39,440 70,000; 94,210 310.70 0 51,980 52,890 81,500; 176,538 273.62 0 76,250 77,390 149,038; 173,076 310.70 -1 27,710 26,440 30,000; 51,600 273.62 -1 40,600 38,710 62,272; 88,947 240.79 -1 59,850 56,770 62,272; 129,807

Fig. 2. Failure endurance analysis ( R = 0): (a) a vs. N and (b) b vs. N . Calculated curves are the present outcomes.

Fig. 3. Failure endurance analysis ( R = -1): (a) a vs. N and (b) b vs. N . Calculated curves are the present outcomes.