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

fluence STM A

of mea 743 CA6

n stres NM al

s on the loy stee l

fatigu

e streng

th of

In A

Br Fed Bra lob A B AS 33 we par and Kw Ac cor

aitner Lob eral Universi sília, Brazil, atoae@gmail. STRACT . T TM A743 C specimens re tested un ameters tha its scatter ofie’s relati cording to t rectly the r ation are co ation makes ength. YWORDS . F

ato da Silv ty of Brasília, 70940-910. com.br, jorge@ he objective A6NM allo were experi der stress t describe th bands. In th ons were te he obtained eduction ef nsistent an it possible

a, Jorge L Mechanical E unb.br, felip of this wo y steel. It is mentally ev ratio 0, 1/3 e fatigue be e assessmen sted in orde results it w fect fatigue d the Walk to evaluate 6NM alloy ned for infin e propagation cess of struc cess depend residual stre minate in fra axes’ flaw nents indent ndurance lim ies demands stress in the complex load rization by the Wöh ing stress, S dman; Gerb

uiz de Alm ngineering D eo2@gmail.co rk is to ev used in sev aluated und and 2/3. havior of th t of the me r to evaluat as possible life and pre er’s relation in a consiste

eida Ferr epartment, Ca m, alex07@ aluate the e eral hydrog er axial load Based on t e evaluated an stress eff e the validi to verify th sented high presented nt way the

eira, Felipe mpus Univer unb.br ffects of m enator turbi s with stres he obtained material, ob ects of fatig ty of the us at Goodman scatter. Th smaller sca effect of th

Oliveira, sitário Darcy

José Alex Ribeiro,

ander Araú

jo

ean stress o ne compon s ratio of - results it tain its S-N ue life, Goo e of such ru and Gerb e prediction tter than K e presence o

n the fatig ents. In ord 1 and mor was possibl curves, its dman, Gerb les for the er’s relation s of Walke wofie’s rel f mean stre

ue behavior er to achiev e 60 specim e to determ endurance li er, Walker tested mate s do not mo r and Kwof ation. Walk sses on fati

of e it, ens ine mit and rial. del ie’s er’s gue

rel rel str

atigue; Goo

er; Walker;

TM A743 C

A6NM.

Kwofie; AS

K E

I N

TRODUCTIO

N

T

he AST compon develop

M A743 CA ents be desig ment and th located pro s failure pro presence of d it can cul common in hese compo stimate the e methodolog cts of mean ts subject to load characte is described the alternat

steel is used ite fatigue lif of those cr tural degrad s strongly on sses, on the g cture of the s, blades and ified that re it of structu a solid char fatigue streng s, for the us

in several e, fatigue cra acks are asso ation that h the stress eometric de structural co rotors. Sta sidual stresse ral compone acterization th and to ide ed material.

hydrogenato cks usually ar ciated to th appens in a levels that a tails and on t mponent af rting from t s are fundam nts are much of the mater ntify the mo

r turbine co e found at th e fatigue pro material und ctivate in the he material. T ter a certain he producti ental facto known and ial. In that w del to be cap

mponents. I e root of tur cess. Fatigue er stress and most loade hese condit number of on, assembly rs to cause relatively re ay, the prese able to predic

n spite of th bine blades. is a perman strain dyna d points of ions can deve cycle loads. T and operat the fatigue. liable. Howe nt work aim t the strengt

ese The ent, mic the lop his ion, The ver, s to h of

pro con stru cra phe con pro the esti ma Bas Th cor

gressive and ditions. Thi cture, on the ck growth an nomenon is ditions of t cedures to e use of these mate the effe chine elemen ic relations of e fatigue life related with

to failure, N st appropria

S-N curve, S hod is a rel

ler curve or a . This met

tress-life, wh ation that c

ere the num an be well

ber of cycles used to adju

, is tely

17