PSI - Issue 21

Amir H. Benvidi et al. / Procedia Structural Integrity 21 (2019) 12–20 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

18

7

25.00

20.00

20 mm

15.00

+90

10.00

0

5.00

-90

Max. to Min. ratio of principal stress

0.00

-90

-60

-30

0

30

60

90

Circumferential angle

Fig. 5. The ratio of maximum to minimum of principal stress in a circular path for a sample with a notch angle 30 ° and depth and diameter of 5 and 2 mm, respectively Moreover, by using the FEM and according to the method described in Section 2, the critical radius is obtained as 1.39 mm for a sample with a depth and notch tip diameter of 5 mm and 2 mm, respectively. By determining the values of and , the final displacement of other specimens was predicted by the ASED criterion. The comparison of average experimental values with those predicted by the ASED criterion is summarized in Table 1 and Fig. 6. Table 1. : The comparison of average experimental values with those predicted by the ASED criterion 30   Critical displacement (mm) Discrepancy (%) Notch tip diameter(mm) Notch depth(mm) Average value of experiment Numerical value 2 5 28.26 - - 2 10 23.07 22.03 4.53 3 5 31.56 28.69 9.09 3 10 25.85 22.72 12.10

Chart Title

Experiment data

Theoretical- ASED Criterion

10 15 20 25 30 35 40

0 5

Rupture displacement (mm)

1

2

3

4

5

6

Fig. 6. Comparison of theoretical predictions of the ASED criterion with the experimental results.