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

S a

(

MPa)

3

53

3

64

4

00

4

40

50

9 .5

S a / M Dev CV

S rt

(%)

3

8.4 3 e+06 1.13 e+05 8.82 1.6 7 tatistic behavi s were used for such str 265 29.8 05 5.3 e+05 05 * * atistic behavio 265 29.8 05 1.7 e+05 05 * * atistic behavio

9.6 43 e+06 4.53 e+05 8.32 8.1 1 or of fatigue li of sample A ess level. 300 33.7 1.8 e+05 4.4 e+04 24.6 r of the fatigue 300 33.7 2.0 e+05 1.5 e+03 0.8 r of the fatigue

.6 47 e+05 2.61 e+02 1.09 8.4 0 ves ( R = -1 ) -

.9 55 e+05 5.75 e+03 9.74 .4 16 Sample B.

ean 1.73 iation 5.49 (%) 3 Table 7 : S 13 specimen ves estimated a) 260 (%) 29.2 n 6.2 e+ ion 5.5 e+ ) 88.9 Table 8 : St a) 260 (%) 29.2 n 7.9 e+ ion 3.5 e+ ) 44.7 Table 9 : St

e+04 e+03 .9

Tes For stat

ts with ratio l the ratio loa istic behavio

oading, 0 ding, R = 0 , r of fatigue li S a (MP S a

and 14 specim

ens of samp

le B. Tabs. 8

and 9 show

the

332 37.3

347 38.9

391 44.0

/ S rt Mea Deviat

9.3 e+04 4.1 e+04 43.7 lives ( R = 0 ) 332 37.3 8.8 e+04 3.8 e+04 42.7 lives ( R = 0 )

7.0 e+04 1 1.0 e+04 2 14.3 - Sample A. 347 38.9 9.7 e+04 2 3.8 e+04 3 38.8 - Sample B.

,9 e+04 .4 e+03 12.4

CV (%

S a

(MP

391 44.0

S a / S rt Mea Deviat

.7 e+04 .2 e+03 11.7

CV (%

Tes For the

ts with ratio l the ratio loa statistic beh

oading, 1/3 ding, R = 1/ avior of the f

3 , 7 specime atigue lives e

ns were used stimated for

of the samp such stress le

le A and 7 s vel.

pecimens of

the sample B

. Tab. 10 sh

ows

S a

(M

Pa)

19

7

200

211 33.7 05 4.0 e+05 1.4 e+05 35.7 c behavior of

216 37.3 2.7 e+05

223 38.9 1.5 e+04

228 44.0 1.3 e+04 7 * * Samples A and

235 26.0 .1 e+04 3.4

270 29.0

S a / S Me Devia CV

(%)

29.

2 29.8 05 3.5 e+ 05 * 7 * ble 10 : Statisti

rt

an 4.9 e+ tion 1.1 e+ (%) 22. Ta oading, 2/3 ading, R = 2 mated for su

e+04 * *

* * s ( R = 1/3 ) -

* * the fatigue live

* *

B

Tes For fati

ts with ratio l the ratio lo gue lives esti

/3 , 19 spec ch stress leve

imens of the l.

sample B w

ere used. Ta

b. 11 shows

the statistic

behavior of

the

S a

(MP

a)

133 14.7

135 14.8

140 15.5

141 15.6

143 15.8 2.0 e+03 6 * * ) - Sample B.

148 16.4 .2 e+01

S a

/ S u Médi Desv CV (% a io

(%)

8.7 e+0 3.7 e+0

5 7.8 e+05 5 4.1 e+05 52.2 tistic behavior

4.4 e+05 1.5 e+05 33.8 of the fatigue

3.7 e+05 4.0 e+04 10.6 lives ( R = 2/3

* *

) 42.3 Table 11 : Sta

22