Fatigue Crack Paths 2003

Curvedside groove

Curvedside groove Radius = 162.5 m m

Radius = 68.9 m m

101

101

Reference curve

Reference curve

100

10-01

10-1

10-2

10-2

10-3

10-3

10

ΔΔK [ M P a m 1/2 ]

ΔΔK [MPam1/2] 10

b

b

Figure 6. Results for linear side groove w th radius 162.5 mm.

Figure 7. Results for linear side groove

with radius 68.9 mm.

Figure 7b shows some pictures of specimens with side grooves with a radius of 68.9

mm. Again a retardation is observed. The natural shear lip angle is smaller than the