Issue 21

D. Croccolo et alii, Frattura ed Integrità Strutturale, 21 (2012) 13-20; DOI: 10.3221/IGF-ESIS.21.02 15 Figure 2 : Specimen draft: K t =3.31. a) b) c) Figure 3 : Pin insertion, specimen lock system and fracture surface . T ESTS ’ RESULTS he test plan and results are reported in Tab. 1, 2 and 3 for OH , I06 and I2 respectively, whereas the corresponding S-N curves are reported in Fig. 4. Open Hole Point # 1 Point # 2 Point # 3 Point # 4 Point # 5 Point # 6 Point # 7 External load (kN) 46.8 41.4 36 30.6 25.2 19.8 14.4 Remote maximum stress (MPa) 650 575 500 425 350 275 200 Cycles 5,897 14,306 21,907 62,105 150,633 252,338 2,000,000 (run out) Table 1 : Stress results for the OH specimens. T