Crack Paths 2009

Table1. Valuesfor coefficient s3 in Eq. (5)

2ot[°]

S3

2ot[°]

S3

4

e4

0

i i _l B 90

0.385

30 36 5

41 62

4

e4

30

£ —5—7 i— ig 120

0.290

25 23 7

38 21

4

*4

60

2 —g i— iE 135

0.235

67 75 7

74 23

U notch, a=10m m

§oR=30m m ,p=0.1 m m

5 Km=8.12, m=0.241, s3=O.566

0,6 20t=135°, a=12.5m m _

§<>R=600 mm, p=3 m m

: Km=2.34,m=0.05,s3=0.235

0-4 20t=90°, a=10 m m

§>

E Km=3.7, m=0.09, s3=0.385

0'2 2ot=60°, a = 1 0 m m

OR=1OOm m ,p=2m m

Km=2.75, m=0.10l5, s3=0.45

0 '

I I I

I

I

I I I I I I

0.001

0.01

0.1

1

10

Distance from the notch tip [mm]

Figure 3. Plot of the stress componentTZy along the notch bisector line of U- and V

notches in a rounded bar and comparison with Eqs. (3) and (5).

Figure 3 shows a comparison between FE results and Eqs. (3) and (5). It is evident that

the proposed correction for stress fields eliminates the inaccuracy previously shownby

Eq. (3).

989