Issue 14

B. Lo

bato da Silva et

alii, Frattura ed

Integrità Struttu

rale, 14 (2010)

36-44; DOI: 10

.3221/IGF-ESIS.

14.04

N Specim

otch radius en # S (M

(3 mm) Pa) Cycles .19 1.2.10 6 .19 1.4.10 6 .20 run ou .19 8.1.10 5 .20 run ou .19 1.2.10 6 .20 run ou .19 9.1.10 5 .20 1.7.10 6 .21 7.5.10 5 84.2  2.6 Table as to evalua s used to det ta method b ined and the the standard herefore, th tatistically sim redict correc t t t

Not Specimen

ch radius (5 m # S (MPa) 223.03 217.56 223.03 217.56 223.03 221.20 219.38 217.56 215.73 213.91 214. sting results fo

m)

Notch Specimen #

radius (8 mm S (MPa)

) Cycles run out run out 1.1.10 6 9.6.10 5 run out run out 15.10 5 4.1.10 5 2.2.10 5 run out 19.1

Cycles 8.2.10 5 run out 5.2.10 5 run out 4.0.10 5 7.4.10 5 7.6.10 5 4.5.10 5 9.4.10 5 run out

1 2 3 4 5 6 7 8 9 10

1 2 3 4 5 6 7 8 9 10

190 186 182 186 182 186 182 186 182 178

1 2 3 4 5 1 2 3 4 5

258.49 269.67 280.86 269.67 258.49 269.67 280.86 269.67 258.49 247.30

S f

S f (MPa) 9 : Staircase te

S f

(M

Pa)

1

8  1.2 r 2.10 6 cycles

(MPa)

255.1 

( R=-1 ).

C O

NCLUSION S

T

he aim o Staircase sizes. A

f this work w method wa reduction da asily determ . However, as waited. T ictions are s s does not p

te the effect ermine the e y Dixon and mean value deviation d e notch fatig ilar and can tly. In additi

gue behavior it and its sta ery efficientl accuracy be able. The fa factor decre he fatigue be steel tested in

of ASTM A ndard deviat y to determin cause the te tigue limit d ases when no havior, othe this researc

743 CA6NM ion for three e fatigue lim chnique con ecreases wh tch radius in rwise Peterso h is less sens

alloy steel. different no it. The statis centrates po en notch ra creases. For n and Neub itive than the

The tch tical ints dius big er’s ory

of notch fati ndurance lim Mood was v is has very oes not reli ue reduction to predict t on, the alloy

pro aro dec rad em mo

perties are e und average reases as it w ius, the pred pirical model dels used.

A C

KNOWLEDG

EMENTS

T

his proje are grate

ct was suppo fully acknow

rted by Cen ledged. We a

trais Elétricas re thankful t

do Norte do o God for th

Brasil S. A. e blessing of

- Eletronorte to live, to pro

and Finatec duce and to

. These supp develop scie

orts nce.

R E

FERENCES

A. Buch, Fa W. Yao, K. P. Kuhn, H NACA TN H. Neuber, R. E. Peters ASTM/A74 Resistant fo B. L. Silva, J Mechanical B. L. Silva, J Engineering ASTM/E46 (2002).

tigue Strengt Xia, Y. Gu, I . F. Hardrat 2805, Langley Int. J. of App on, In: Meta 3/A743M – r General Ap . L. A. Ferre Engineering . L. A. Ferre , Gramado, R 6-96, Standa

h Calculation nt. J. Fatigue h, An Engin Aeronautica lied Mec., 2 l Fatigue, G. 06, Standard plication, (20 ira, F. Olivei , Gramado, R ira, J. A. Araú io Grande d rd Practice

, Trans Tech , 17 (1994) 2 eering Metho l Laboratory 8 (1961) 544. Sines & J. L. Specification 06). ra, J. A.Araúj io Grande d jo, In: Proce o Sul, Brazil for Conducti

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, Switzerland ating the No (1952). tors, New Yo s, Iron–Chro dings of CO 2009). BEM 2009, Amplitude A

(1988). tch-Size Effe

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43