Issue 35

R. Citarella, Frattura ed Integrità Strutturale, 35 (2015) 523-533; DOI: 10.3221/IGF-ESIS.35.58 531 a x y b Figure 10a-b : Von Mises stresses (a) calculated with a load of 143MPa on the internal points (b) between crack tip N. 1 and hole N. 4 (see Fig. 7d). Iter.   a in +da t +r y K eq residual ligament da r y (MPa) (MPa) (mm) (MPa*mm 1/2 ) (mm) (mm) (Irwin correction) Crack Tip N.1 1 63 5 16.24 730 3.36 0 0 2 (yield.) 68 10 17.15 788 2.45 0 0.91 3 78 10 3.40 995 16.20 0.3 0 4 88 10 3.73 1111 15.87 0.3 0 5 98 10 4.00 1237 15.60 0.4 0 6 108 10 4.40 1364 15.20 0.5 0 7 118 10 4.90 1455 14.70 0.4 0 8 128 15 8.94 1522 10.66 0.4 3.64 9 143 11.43 1754 8.17 1.5 4.23 Crack Tip N. 2 - hole N. 10, right side 1 63 5 6.15 701 13.45 0 0 2 68 10 6.15 772 13.45 0 0 3 78 10 6.15 886 13.45 0 0 4 88 10 6.15 1000 13.45 0.3 0 5 98 10 6.49 1114 13.11 0.3 0 6 108 10 6.77 1227 12.83 0.4 0 7 118 10 7.12 1349 12.48 0.5 0 8 128 10 10.79 1474 8.81 0.5 3.13 9 (yield.) 143 13.52 1703 6.08 1.4 3.97 Crack Tip N. 3 - hole N. 15, left side 1 63 5 11.07 440 8.53 0 0 2 68 10 11.07 484 8.53 0 0 3 78 10 11.07 555 8.53 0 0 4 88 10 11.07 625 8.53 0 0 5 98 10 11.07 696 8.53 0 0 6 108 10 11.07 767 8.53 0 0 7 118 10 11.07 841 8.53 0 0 8 128 15 11.07 952 8.53 0.3 0 9 143 13.22 1075 6.38 0.25 1.65 Table 1 : Crack advance vs. monotonic increasing load.