PSI - Issue 42

1756 Paulo Mendes et al. / Procedia Structural Integrity 42 (2022) 1752–1761 Paulo Mendes, Rita Dantas, José A.F.O Correia, Nicholas Fantuzzi, Abílio M.P. Jesus / Structural Integrity Procedia 00 (2019) 000 – 000 5 Where, for mild steel ( ) is: ( ) = 1 − 1 − 0.4 ∙ , −1 ≤ ≤ 0 (9) ( ) = 1 − 1 − 0.6 ∙ , > 0 (10) Table 1 and Table 2 show the fatigue results of the double-side welded connection under constant loading conditions based on hot-spot and nominal stresses, respectively. Table 1 presents the results obtained with hotspot stress definition and Table 2 (different specimens) registers the results for the specimens tested without strain gauges, therefore evaluated with the nominal stress criterion.

Cycles

Table 1 – Normalized results under constant loading conditions based on hot-spot stresses of the double-side welded connection.

Hot-spot stress range [MPa]

No. Specimen

1 2 3 4 5 6 7 8 9

1.50E+05 6.90E+05 5.26E+05 4.86E+05 7.19E+05 3.63E+05 3.73E+05 5.28E+05 4.44E+05 4.96E+05 8.41E+05

566.43 300.76 300.44 316.07 279.21 311.11 311.09 326.54 323.08 301.90 327.6

10 11

Table 2 – Normalized results under constant loading conditions based on nominal stresses of the double-side welded connection. No. Specimen Cycles Nominal stress range [MPa] 1 3.21E+05 323.78 2 1.50E+05 323.78 3 6.90E+05 283.33 4 5.26E+05 283.33 5 4.86E+05 277.33 6 7.19E+05 267.35 7 3.63E+05 297.53 8 3.73E+05 297.53 9 5.28E+05 283.33 10 4.44E+05 313.33 11 4.96E+05 297.53 12 8.41E+05 289.33 13 1.00E+07* 210 14 1.00E+07* 267.35 15 1.00E+07* 253.33 16 1.00E+07* 267.35 17 1.00E+07* 273.39 18 1.00E+07* 277.33 * run-out