Issue 54

I. El-Sagheer et alii, Frattura ed Integrità Strutturale, 54 (2020) 128-135; DOI: 10.3221/IGF-ESIS.54.09

values of normalized J-integral of edge repaired cracked plate versus a/W . The use of a double composite patch has a higher effect than using a single composite patch as shown in Fig. 7.

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

(b)    h = 50 & N = 4 & [0/45]4 

(a)         h = 50 & N = 4 & [0]4 





0  15 

0 15 30 45

30 45

Normallized J‐Integral

Normallized J‐Integral

0

0.1

0.2

0.3

0.4

0.5

0.6

0

0.1

0.2

0.3

0.4

0.5

0.6

a/W

a/W

Figure 4: The effect of inclined crack angle,  , on the values of normalized J-integral of edge repaired cracked plate with: (a) [0] 4 and (b) [0/45] 2s .

1.2

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

(a)              =  0 &  [0]4

(b)         =  60 &  [0]4

1

h, mm

h, mm

30 40 50 60

30 40 50 60

0.8

0.6

0.4

0.2

Normallized J‐Integral

Normallized J‐Integral

0

0

0.1

0.2

0.3

0.4

0.5

0.6

0

0.1

0.2

0.3

0.4

0.5

0.6

a/W

a/W

Figure 5: The effect of patch height length, h , on the values of normalized J-integral of edge repaired cracked plate with: (a)  = 0 o and (b)  = 60 o .

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9

h = 50 & [0]4 &  = 0

N

2 4 6

Normallized J‐Integral

0

0.1

0.2

0.3

0.4

0.5

0.6

a/W

Figure 6: The effect of patch number of layers, N , on the values of normalized J-integral of edge repaired cracked plate.

133