Crack Paths 2006

Figure 13. Definition of the length of the crack emanating

from an elliptical hole under shear.

x

x

1

1

1

1

1

1

y

y

y

y

b

bb

1

1

a

a

x x

x x

o

o

1

1

y

y1

1

(b)a= 1,b=0.2,b/a=0.2.

(a)a= 1,b=0.5,b/a=0.5.

Fig. 14 Crack propagation path from the edge of elliptical hole under shear stress [17].

0.345

45º

56780

y

b

a

x

o

T

y

max

45º

b

l0: initial crack length

x

o

0.12

T

max

l

0

0.4 0.6 0.8

0

0.2

1

Aspect ratio b/a 0.2 0.4 0.6 0.8

1234

0

1

Aspect ratio b/a

Fig. 15 Relationship between Tmax and aspect ratio b/a for

Fig. 16 Relationship between the crack

length l/D at T=Tmax

and aspect

elliptical holes [17].

ratio b/a for elliptical holes [17].