Issue 14

B. Lo

bato da Silva et

alii, Frattura ed

Integrità Struttu

rale, 14 (2010)

17-26; DOI: 10

.3221/IGF-ESIS.

14.02

1000

1000

9

R = -1 R = 0

900

8

7

Confidence Interval Limits

- Kwofie Eq.

800

R = 1/3 R = 2/3 Trend Line

6

700

5

600

4

500

3

R = -1 R = 0 R = 1/3 R = 2/3

400

Sar [M Pa] Kwofie

Sar [MPa]

300

2

200

Trend Line - Kw Basquin Eq. Bas Confidence Inte

ofie Eq. ed on Experimental Da rval Limits - Basquin Eq

ta .

100

100

0

1.0E+3

1.0E+4

1.0E+5

1.0

E+6

1.0E+7

0 1

re 12 : Kwofie’ 00 200 300 400 Sar [MP

s scatter diagra 500 600 700 80 a] - Eq (2.2.1)

0 900 1000

Num

ber of Cycle (N)

Figure 11 : Kw

ofie’s predicti

on.

Figu

m.

C O

NCLUSION S

T

he aim o alloy ste results w

f this resear el. In that se ere used to n’s alternatin edict the mea oy steel is 38 on around 5 an stress effe for the pres ffect of the m

ch was to eva nse, S-N curv determine t g stress and n stress effec 3 MPa; b) th 0% in the e ct on the fa ence of mean ean stress o

luate the eff es were exp he enduranc predictions o ts. By means e fatigue lif ndurance lim tigue strength stress but p n the fatigue

ect of mean erimentally d e limit of th f such mode of the obtai e is strongly it; c) Good , turning its resents relativ strength of A

stress of the etermined fo e material a l. The Good ned results it influenced b man and G use non-rec ely high scat STM A743

fatigue behav r loading rati nd to evalua man, Gerber is possible t y the presen erber’s mode ommended; d ter; e) Walke CA6NM allo

ior of ASTM os of -1, 0, 1 te the comp , Walker and o infer: a) the ce of mean s l were show ) Kwofie’s m r’s model wa y steel.

A743 CA6 /3 and 2/3. arative diagr Kowfie’s mo fatigue stren tresses, havin n inadequate odel presen s the best mo

NM The ams del gth g a to ts a del

bet we lim

ween Basqui re used to pr it for this all erior reducti cribe the me d prediction escribe the e

sup des goo to d

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

Y-L. Lee, J Butterworth N. E. Dowl K. N. Smith K. Walker, Testing and A. Berkovit S. Kwofie, I ASTM / E 6 ASTM / E 4

. Pan, R. H -Heinemann ing, Mechani , P. Watson, Effect of E Materials, W s, D. Fang, In nt. J. Fatigue 06-04 - Stand 66-96 - Stand

athaway, M , USA (2005) cal Behaviou T. H. Toppe nvironment est Conshoh t. J. Fatigue, , 23 (2001) 8 ard Practice fo ard Practice fo

. E. Barkey . r of Material r, Journal of and Comple ocken, PA, ( 15 (1993) 17 29. r Strain - Con r Conducting

, Fatigue T s, 2 nd edition, Materials, AS x Load Hist 1970) 1. 3. trolled Fatigu Constant Am

esting and A Prentice-Ha TM, 5(4) (19 ory on Fatig

nalysis (Th ll, Englewood 70) 99.767. ue Life, AST

eory and Pr Cliffs, NJ, ( M STP 462

actice), Else 1998). , Am. Soc.

vier

[1] [2] [3] [4] [5] [6] [7] [8]

For

e Testing, (20 plitude Axial

04). Fatigue Tests

of Metallic M

aterials, (200

2).

25