Crack Paths 2009

160mm

h

w12=240mm

t12=2.28mm 1m.6m

R = 3 0 m m

a0

5

00m m

Fig.1 Geometry of the offset hole SE(T) specimen

2. E X P E R I M E N TRAE SLU L T S

In order to study the effect of weld and parameter weld on crack growth and crack

paths, samples ware tested without and with the hole.

2.1 Samples Without The Hole

2.1.1 The Effect of Weld on Crack Growth Rate

Fig 2 shows fatigue crack growth rates dNda/ as a function of

appliedK in the pad-up

20mmx2.2mmF S W samples, one without weld, and another one with weld. Both

results are compared with parent material. With the weld, crack grows slower than

without the weld and parent material.

1.00E-087654

2.2-20-nohole-noweld

2.2-20-nohole-weld

2198-ParentMaterial

1.00E-09

1

1 0

1 0 0

d e l t K ( M P a m ^ 0 . 5 )

Fig 2 Crack growth rates versus

K  for the same pad-up (20x2.2), R = 0.1

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