Issue 36

L. C. H. Ricardo et alii, Frattura ed Integrità Strutturale, 36 (2016) 201-215; DOI: 10.3221/IGF-ESIS.36.20

Plastic Zone Size (mm)

Smallest Finite Element Size (mm)

Estimated

0.48 0.10

0.048

Used

0.025 Table 4 : Smallest Finite Element Size.

Crack Propagation Rate

model

(mm/cycle)

Model Name

1 2 3 4

0.25

SAE0.25 SAE0.5 SAE0.75 SAE1.0

0.5

0.75

1.0

Table 5 : Crack Propagation Rate.

R ESULTS

F

igs. 9 and 10 present, respectively,  op 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. and  cl

SAE 0.25 mm SAE 0.50 mm SAE 0.75 mm SAE 1.0 mm

0 10 20 30 40 50 60 70 80 90

Crack Open Stress ( MPa)

2

3

4

5

6

7

8

9

10

Number of Cycles

Figure 9 : Crack Opening Stress (σ yy+)

[57].

Figure 10 : Crack Closing Stress (σ yy-)

[57].

210