Method for rapidly optimizing fatigue strength of metal material

The invention discloses a rapid optimization method for fatigue strength of a metal material, and belongs to the technical field of material science and engineering application. The method comprises the following steps: (1) carrying out tensile strength optimization on a to-be-optimized metal material to obtain two groups of samples with different tensile strengths; (2) obtaining tensile strength and fatigue strength through a test, and obtaining C and P values through a formula (1); (3) obtaining critical tensile strength through a parabolic relation formula (2) of metal material fatigue and tensile strength; (4) carrying out tensile strength optimization on the to-be-optimized metal material to obtain a metal material sample with a critical tensile strength value close to the critical tensile strength value, and taking the tensile strength and the fatigue strength of the group of metal material samples as verification data to verify whether the error between the fatigue strength obtained by the test and the