PSI - Issue 68

Robert Szlosarek et al. / Procedia Structural Integrity 68 (2025) 1173–1180 Robert Szlosarek et al. / Structural Integrity Procedia 00 (2025) 000–000

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Fig. 5. (a) stress amplitude vs. cycles; (b) damage vs. cycles. Fig. 6 depicts the results in term of cycles to failure of the numerical computations. The graphs show the experimental results on the x-axis and the value of the computations on the y-axis. Hence, if the numerical result is equal to the experimental results, it is placed directly at the best fit curve. The visual impression leads to the conclusion that the numerical results with the values taken at half of the lifetime and the results obtained with the transient material parameters, thus functions for ′ and ′ are more or less equal.

Fig. 6. (a) results for the swaged material; (b) results for the casted material. In order to evaluate the results by a numerical value the logarithmic standard deviation was calculated for each test. Finally, all standard deviations were summed up for each test series and each calculation approach. Tab. 1 shows the calculated logarithmic standard deviation for each test as well as the sum for each test series.