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Table 2 Parameters employed in fitted S–N curve by smooth specimens of A357-T6

From: Fatigue Characterization on a Cast Aluminum Beam of a High-Speed Train Through Numerical Simulation and Experiments

Parameter Without defects, R = 0.1 With defects, R = 0.1 With defects, R = –1
N ≤ 5 × 106 > 5 × 106 ≤ 5 × 106 > 5 × 106 ≤ 5 × 106 > 5 × 106
m 5.62 10.24 6.289 11.578 7.353 13.706
C 1.49 × 1016 9.11 × 1023 2.34×1017 2.2 × 1026 1.26 × 1021 3.51 × 1033