Crack Paths 2012

t i o n Axial direction 200mμ (a)

etp h d i r e c

cyclees cycles

D

N=1.53×10 5

N=1.62×105 5

N=1.64×10

(b)

cycles

N=1.78×10 5 N .84×105

200mμ

cycles

Figure 7. Internal shape of Crack A by measured by slices of C Timages.

2a II

Crack dlenpgtthh, b(Mode II),

5

2aI(=+)aaI1I2

Crack length (

Mode I)

,

150000

2aII

aI2

aI1

15.04010× 5

1.610× 5

1.810×

Numberofcycles, N (cycles)

Figure 8. Crack growth curves of Crack A.

116