Issue 47

S. Bressan et alii, Frattura ed Integrità Strutturale, 47 (2019) 126-140; DOI: 10.3221/IGF-ESIS.47.10 130 (a) K t,n =1.5 (b) K t,n = 2.5 (c) K t,n = 4.2 (d) K t,n = 6.0 Figure 3: Tested notched specimens (mm). T EST RESULTS Failure life he number of cycles to failure (failure life), N f , for each specimen is listed in Tab. 2. The failure life corresponds to the cycle where the stress amplitude becomes the 3/4 of the maximum stress in a cycle to avoid the complete propagation of the crack and therefore rupture of the specimen. Loading paths K t,n 6061Al 316LSS Δε eq /2 N f Δε eq /2 N f % Cycles % Cycles PP 1 0.25 44500 0.35 6089 1.5 3848 2237 2.5 1267 871 4.2 788 571 6 730 418 CI 1 0.25 6500 0.35 2082 1.5 1020 2248 2.5 298 475 4.2 207 212 6 205 156 Table 2 : Test results. T