Issue 42

M. Kowalski, Frattura ed Integrità Strutturale, 42 (2017) 85-92; DOI: 10.3221/IGF-ESIS.42.10 90 Specimen w, H, Fa, kN Stress, MPa N exp , cycles mm mm σ ti σ int σ st P01 10 9 24 155.3 233.0 326.2 6650 P02 10 9 21.5 139.2 208.7 292.2 98310 P03 9.7 9 19.9 132.8 199.2 278.9 895970 P04 9.62 9.02 23 154.5 231.8 324.6 34390 P05 9.54 8.74 24.5 169.1 253.6 355.0 26570 P06 9.46 8.96 22 150.9 226.4 316.9 104820 P07 9.76 9.02 23.1 153.0 229.5 321.3 22980 P08 9.84 9 21.1 138.8 208.2 291.5 134850 P09 9.7 9.08 23.1 153.3 230.0 322.0 28860 P10 9.7 9 19.6 130.8 196.2 274.6 263540 P11 9.82 9 21 138.4 207.6 290.7 117640 P13 10.08 9.08 25 159.7 239.6 335.4 132600 P14 9.9 9 25 163.4 245.2 343.2 195050 P15 9.85 8.93 28 184.8 277.2 388.1 31100 P16 9.85 8.93 30 198.0 297.0 415.9 9100 P17 9.85 8.85 33 219.0 328.5 459.8 2710 where: w, h –specimen section dimensions , σ ti – stress in titanium layer, σ int – stress in interface zone, σ st – stress in steel layer F a – force amplitude. Table 3 : Results of the fatigue tests. Figure 7 : Hysteresis loops recorded during fatigue tests.