PSI - Issue 28

Slobodanka Boljanović et al. / Procedia Structural Integrity 28 (2020) 2370 – 2377 Slobodanka B oljanović et al. / Procedia Structural Integrity 00 (2020) 000 – 000

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and Fig. 3a, 3b for stress ratio equal to R = -1 and 0, respectively. Moreover, it can be deduced from Table 1 that relevant assessments obtained within the present computational research correlate well with those experimentally determined by the Grover et al. tests (1953).

Fig. 2. Residual life assessment for the plate with quarter-elliptical corner crack ( R = -1, S max = 240.79 MPa): (a) a vs. N ; (b) b vs. N , calculated curves are the present results.

Fig. 3. Residual life assessment for the plate with quarter-elliptical corner crack ( R = 0, S max = 273.62 MPa): (a) a vs. N ; (b) b vs. N , calculated curves are the present results.

Table 1. Comparison between the life assessment and experimental data, the calculations are the present results and experiments are discussed by Grover et al. (1953). R = -1 R = 0 S ma x (MPa) N cal. (cycles) N exp. (cycles) S ma x (MPa) N cal. (cycles) N exp. (cycles) 310.70 27710 30000, 51600 342.55 38680 70000, 94210 273.62 40600 62272, 88947 310.70 51980 81500, 176538 240.79 59850 62272, 129807 273.62 76250 149038, 173076