Issue 51

F. Fabbrocino et alii, Frattura ed Integrità Strutturale, 51 (2020) 410-422; DOI: 10.3221/IGF-ESIS.51.30 419 Figure 10 : (a) Crack tip speed vs crack tip position and (b) variation of dynamic stress intensity factor vs time for the numerical simulation performed by using different mesh discretizations (M1, M2 and M3). Figure 11 : Synoptic representation of the mesh motion during the crack propagation for the M1 mesh configuration. Additionally, a numerical case study similar to the previous one but subjected to mixed mode crack propagation is investigated. The geometry and the loading configurations are reported in Fig. 12a, whereas material characteristics are summarized in Tab. 1. The rectangular plate, fixed at the bottom edge, is loaded by prescribing the upper pin with a vertical displacement until the mode I SIF reached the value of 0.5 2.32 MPa m I K  . The motion of the crack tip region is driven by the crack growth criterion, while the crack is assumed to propagate along the direction computed by using the crack propagation angle defined on the basis of the Maximum Energy release rate criterion [19]. Figure 12 : Mixed mode crack propagation: (a) geometry and loading configurations; (b) initial mesh configuration. .