Issue 36

L. C. H. Ricardo et alii, Frattura ed Integrità Strutturale, 36 (2016) 201-215; DOI: 10.3221/IGF-ESIS.36.20 210 Plastic Zone Size (mm) Smallest Finite Element Size (mm) Estimated 0.48 0.048 Used 0.10 0.025 Table 4 : Smallest Finite Element Size. model Crack Propagation Rate (mm/cycle) Model Name 1 0.25 SAE0.25 2 0.5 SAE0.5 3 0.75 SAE0.75 4 1.0 SAE1.0 Table 5 : Crack Propagation Rate. R ESULTS igs. 9 and 10 present, respectively,  op and  cl against the numbers of cycles. Figs. 11 and 12 present examples of results of post-processing results from model SAE0.50 showing the stress field in the region near where the crack opens and closes. 0 10 20 30 40 50 60 70 80 90 2 3 4 5 6 7 8 9 10 Number of Cycles Crack Open Stress ( MPa) SAE 0.25 mm SAE 0.50 mm SAE 0.75 mm SAE 1.0 mm Figure 9 : Crack Opening Stress (σ yy+) [57]. Figure 10 : Crack Closing Stress (σ yy-) [57]. F