Issue 53

P. Fathi, Frattura ed Integrità Strutturale, 53 (2020) 457-473; DOI: 10.3221/IGF-ESIS.53.36 467 Number of Elements Mesh shape Stress Distribution Maximum stress value (MPa) Difference Row 2 1486 ـــــــــــــــ 1 5 ـــــــــــــــ No response ـــــــــــــــ 2 20 1088 3.98% 3 25 1072 0.16% 4 40 1067 0.28% 5 Table 6: The results of mesh convergence. Figure 11: Boundary conditions for connections. Figure 12: Contact conditions for connections. R ESULTS AND DISCUSSION he time-diagram of the failure occurrence for the elements around the hole in the specimen can be seen according to the following formula based on the Hashian failure criterion: Fig. 13 Selection of round hole elements for strength diagram and Fig. 14 Diagram of failure criterion in time for round hole elements and Fig. 15 The direction of failure in the specimen under experimental test and Fig. 16 Direction of failure in modeling specimen is shown. T