PSI - Issue 17

S. Mousa et al. / Procedia Structural Integrity 17 (2019) 284–291 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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 = 0 o

 = 15 o

 = 30 o

 = 45 o  = 60 o Fig. 6. The failure shape of FGM specimen with inclined pre-crack under point bend by using XFEM. Figures 7 and 8 illustrate the effect of pre-crack site of FGM speciment on the crack path. As shown in the figures, the crack path grows in a parallel maner independent of the crack length of the pre-crack. The crack which emanates from the pre-crack grows toward the oppositee side corresponding to the applied load.

10 12 14 16 18 20

10 12 14 16 18 20

(b) 2L/S = 0.25

(a) 2L/S = 0

a/W= 0.1 a/W= 0.2 a/W= 0.3 a/W= 0.4 a/W= 0.5

a/W= 0.1 a/W= 0.2 a/W= 0.3 a/W= 0.4 a/W= 0.5

0 2 4 6 8

0 2 4 6 8

y - crack tip

y - crack tip

49.5

49.7

49.9

50.1

50.3

50.5

39

40

41

42

43

x - crack tip

x - crack tip

10 12 14 16 18 20

10 12 14 16 18 20

(c) 2L/S = 0.5

(d) 2L/S = 0.75

a/W= 0.1 a/W= 0.2 a/W= 0.3 a/W= 0.4 a/W= 0.5

a/W= 0.1 a/W= 0.2 a/W= 0.3 a/W= 0.4 a/W= 0.5

0 2 4 6 8

0 2 4 6 8

y - crack tip

y - crack tip

29

30

31

32

33

34

35

16

18

20

22

24

26

28

x - crack tip

x - crack tip

Fig. 7 The effect of 2L/s on the crack path under 3PB.