Issue 51

F. Frabbrocino et alii, Frattura ed Integrità Strutturale, 51 (2020) 410-422; DOI: 10.3221/IGF-ESIS.51.30 416 the prescribed value, a restart procedure is achieved and the crack propagation is enforced by the crack growth criterion. In particular, the curve experimentally determined in [25] is implemented to compute the crack tip velocity at each time increment of the simulation (Fig. 5). It is worth noting that, in the present loading scheme, the crack proceeds along the horizontal direction, leading the crack angle always to be equal to zero. Figure 4 : Araldite-B rectangular double cantilever beam: (a) geometry and loading configurations; (b) initial mesh configuration. (MPa) E   (MPa) 3   (kg m ) 3660 0.39 1316 1172 Table 1 : Mechanical properties of Araldite-B. Figure 5 : Dynamic fracture toughness vs. crack tip speed for Araldite-B. The dynamic behavior of the structure is analyzed by means three different loading levels, which are featured by the initial values of SIF reached during the static loading step:  (L1)  (L2)  (L3) 0 5 1 33  . . MPa m I K 0 5 1 76  . . MPa m I K 0 5 2 32  . . MPa m I K