Issue 14

B. L

obato da Silva

et alii, Frattura

ed Integrità Stru

tturale, 14 (201

0) 17-26; DOI:

10.3221/IGF-ESI

S.14.02

Mo Fig res out lev

dels’s adheren s. 7 and 8 sh ults, it is veri of the conf els around 72

ce to experime ow the fatig fied a relative idence limits % lower than

ntal results: G ue experimen ly high scatte of the Basq real failure

erber’s model tal data and r, approxima uin’s equatio conditions an

the predictio tely 300 MP n. This mod d it is extrem

ns based on a. The trend el predicts t ely conserva

Gerber’s m line of the pr he possibility tive.

odel. Based o edict results to apply, o

n the presen for this mod n average, st

ted el is ress

1000

1000

5 6 7 8 9

5 6 7 8 9

R = -1 R = 0

R = 1/3 R = 2/3

R = -1 R = R = 1/3 R =

0 2/3

4

4

3

3

Sar (MPa)

2 Sar Gerber (MPa)

2

Trend Li Confiden Trend Li Confiden

ber’s predictio ntal results: W ta and the p this model h asquin’s curv 50 MPa. +4 1E+5 1 ber of cycle (N) ne - Gerber Eq. ce Interval - Gerber ne - Basquin Eq. ce Interval - Basqui

Eq.

Tre

nd Line

n Eq.

100

100

1E

100

Figure 7: Ger ce to experime erimental da indicate that ery well to B proximately +2 1E+3 1E Num

E+6 1E+7

1000

Sar Ba

squin (MPa)

n. alker’s mode redictions b as a level of e. In addition

Figu

re 8: Gerber’s

scatter diagra

m.

Mo Th obt we ord

dels’s adheren e fatigue exp ained results re adjusted v er of size, ap

l ased on Wa adherence sig , the confide

lker’s model nificantly hig nce intervals

are showed h to the exp associated t

in the Figs erimental res o both mode

. 9 and 10. ults because t ls have the s

The hey ame

1000

1000

5 6 7 8 9

5 6 7 8 9

R = -1 R = R = 1/3 R =

0 2/3

4

4

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

3

3

Sar (MPa)

2 Sar Walker (MPa)

2

Trend Li Confiden Trend Li Confiden

lker’s predictio ntal results: K the fatigue e d that in a w ned results w larger than t +4 1E+5 1 ber of cycle (N) ne - Walker Eq. ce Interval - Walker ne - Basquin Eq. ce Interval - Basqui

Eq.

Tre

nd Line

n Eq.

100

100

1E

Figure 9 : Wa ce to experime d 12 show d it is verifie h. The obtai MPa, twice +2 1E+3 1E Num

E+6 1E+7

100

1000

Sar Ba

squin (MPa)

n wofie’s model xperimental ay similar to ere adjusted he value pre

Figu

re 10 : Walker’

s scatter diagr

am

Mo Th res exp are adh

dels’s adheren e Figs. 11 an ults presente ressively hig around 100 erent.

the nce vals less

data and the Walker’s mo well by the sented by W

predictions del, Kwofie’s Basquin’s tre alker’s mode

based on K model also nd line. How l. In other w

wofie’s mod presents a le ever, its con ords, Kwofi

el. Based on vel of adhere fidence inter e’s model is

24