Issue 14

B. L

obato da Silva

et alii, Frattura

ed Integrità Stru

tturale, 14 (201

0) 36-44; DOI:

10.3221/IGF-ESI

S.14.04

ce limit. S fe Deviatio 2.6 1.2 19. based on Stair rength with ar when notc between ex s sensitive th

(M

Pa)

Not

ch radius (mm 3 5 8 urance limit f otch fatigue are statistica ifferent. The CA6NM all

) Enduran Mean 184.2 214.6 255.1 or each notch reduction st lly very simil comparison oy steel is les

n

1 case method. decrease of n h radius is b perimental an prediction

Table 7 : End

Tab Pet not em

. 8 and Fig. erson and N ch size the pirical model

7 show an euber’s empi notch factor s shows that

increase of n rical models are more d ASTM A743

otch radius. ig. However notch fatigue s (Fig.7).

In addition, , when decre factor and

the ases the

300.

0

250.

0

200. Sfe (MPa)

0

Experimen

tal data

150.

0

2.00

3.0

0

4.00

5.00 notch radiu

6.00 s (mm)

7

.00

8.00

9.00

Figure 6 : Com

parison betwe

en endurance

limits of notch

ed specimens .

factor. K f

Fatigue notc perimental Eq. 2 .96  0.08 .04  0.07 .55  0.12 ue notch redu

h reduction Neuber Eq. 4 2.27  0.03 1.95  0.05 1.51  0.06 ction factor es

Notch radiu 3 5 8 xperimental an

s (mm) Ex 1 2 1 d theory fatig

Peterson Eq. 6

2.37  0.03 2.02  0.05 1.54  0.06 timate for each

Table 8: E

geometry.

3.00

Experime Neuber Peterson

ntal

2.00

Kf

1.00

2.00

3

.00

4.00

5.00 Notch radius

6.00 (mm)

7.00

8.00

9.00

Figure 7 : Com

parison betw

een experimen

tal and theory

models for no

tch fatigue re

duction factor .

42