Issue 53

Q. Zheng et alii, Frattura ed Integrità Strutturale, 53 (2020) 141-151; DOI: 10.3221/IGF-ESIS.53.12 147 factors because of 100165.1( 1 2 z z )> 7605.13( 1 3 z z )> 5961.13( 2 3 z z ); when the single factor interacts, the effects of maximum stress, roughness, and residual stress increase sequentially because of 12482.1( 3 z )>112798( 2 z )>91024( 1 z ); when comprehensively considered, residual stress> roughness and residual stress interaction> roughness. Experiment number 1 z 1 2 z z 2 z 1 3 z z 3 z 2 3 z z Roughness / m  Residual Stress/ a MP Maximum stress / a MP Fatigue life /time 1 1 1 1 1 1 1 5 100 500 459 2 1 1 1 -1 -1 -1 5 100 100 19929 3 1 -1 -1 1 1 -1 5 -300 500 5020 4 -1 1 -1 -1 1 -1 1 -300 500 123392 5 -1 -1 1 -1 1 1 1 100 500 606 6 -1 1 -1 1 -1 1 1 -300 100 436286 7 1 -1 -1 -1 -1 1 5 -300 100 65899 8 -1 -1 1 1 -1 -1 1 100 100 7220 Table 3: Ternary regression orthogonal experimental design and analysis of simulation results. Parameter Result Multiple R 0.999703 R square 0.999406 Adjusted TR square 0.995839 Standard error 12419.98 Observation value 8 Table 4: Ternary orthogonal regression analysis data sheet. Coefficients P value Intercept 119851.4 0.023314 1 z -91024.6 0.028792 1 2 z z 100165.1 0.027891 2 z -112798 0.024771 1 3 z z -7605.13 0.333352 3 z -12482.1 0.21535 2 3 z z 5961.13 0.404182 Table 5: Correlation coefficient and P value.