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Table 11 Results of four optimization methods

From: Structural Stress–Fatigue Life Curve Improvement of Spot Welding Based on Quasi-Newton Method

Optimization methodsS–N curveR2
C1lg S = − 0.1694 lg N + 3.25060.8445
C2lg S = − 0.17493 lg N + 3.49010.8906
C3lg S = − 0.16948 lg N + 3.28110.8573
C4lg S = − 0.1704 lg N + 3.262160.8874