Issue 48

F. V. Antunes et alii, Frattura ed Integrità Strutturale, 48 (2019) 676-692; DOI: 10.3221/IGF-ESIS.48.64 684 from (a,N) experimental results. Fig. 8 presents experimental crack shapes for different loading directions, which are indicated for each case. The cracks adopted a direction approximately normal to loading direction, i.e., tend to propagate under mode I loading. However, (  ) is not exactly zero and increases with  and with crack length. Test   º   F  N  R 1 30 1539 0.05 2 45 1900 0.05 3 60 2043 0.05 4 76 2394 0.05 Table 3 : Experimental parameters used in the tests. Figure 8 : Experimental crack shapes. Figure 9 : Comparison of present solution with Richard’s solution (  =60º). 0 0.004 0.008 0.012 0.016 0.02 0.0425 0.0475 0.0525 0.0575 0.0625 0.0675 x [m] y [m]  =75º  =30º  =60º  =45º  =30º 75º 6 8 10 12 14 16 18 0.045 0.050 0.055 0.060 x [m] K v [MPa.m1/2]] present solution; Kv versus x Richard's solution; Kv versus x Richard's solution; Kv versus a -6% -31%