Crack Paths 2006

11000

R = 0

600

As welded

400

As-welded

200

Experimental life

Residual life predicted

10 4

10 5

10 6

10 7

Cycles to failure, N

Figure 4: Fatigue strength data and residual life estimates. Residual life determined by

assuming the initial crack length ai = 0.3mm and the crack propagation along the

direction (T = 22.5°). Y=1.122—sec(Sa/t); coefficients in the Paris law: m=3.0;

C=0.183x 10-12, (N and m mas units), (Gurney, 1991).

1000

200

Experimental life Residual life pr dicted

R = 0

4600

As-welded

100

104

105

106

107

Cycles to failure, N

Figure 5: Fatigue strength data and residual life estimates. Residual life determined by

assuming the initial crack length a0 = 0.3mm and the crack propagation along the

direction T = 22.5°. Y=1.122—sec(Sa/t). Coefficients in the Paris law: m=4.0; C=0.2046

10-15 (N and m mas units), (Gurney 1991).