Fatigue Crack Paths 2003

01 f =75,0867 Hz

02f=287,8127 Hz

Symmetric

Skew-symmetric modalshape

modal shape

(uncracked frame)

(uncracked frame)

f=69,7923

f=280,943

Hz

Hz

1

2

Cracked section

Cracked section a/H=0.1

a/H=0.1

f=61,4218Hz 1

2f=270,240 Hz

Cracked section

Cracked section

a/H=0.3

a/H=0.3

a/fH=508.,59600 Hz 1

f=265,386 Hz 2

Cracked section

Cracked section

a/H=0.5

Figure 4. Bending momentredistribution for the first two modal shapes when various

values of the crack depth are investigated.