Issue 14

B. L

obato da Silva

et alii, Frattura

ed Integrità Stru

tturale, 14 (201

0) 36-44; DOI:

10.3221/IGF-ESI

S.14.04

Estim Estimate

ate value

Confidence Lower 1416.3 -0.120 d of Parallel-p cycles, the e e method [8] E 466-96 [ tion, Tab. 4

intervals Upper 1901.9 -0.097 rojected meth ndurance lim . Therefore, t 9] and forged presents the

Parame

ter

Deviation 116.4 0.006 meter obtaine ife of 2.10 6 g to Staircas e with ASTM b. 4. In addi

A b ble 3 : Basquin ted method 360.1 14.0  M re produced ameters are ]. 2 0.647 a c       

1659.1 -0.108 ’s fatigue para for fatigue l Pa accordin in accordanc shown in Ta

Ta

od.

Ac Ho this Fig fac

cording to P wever, Silva work. The s . 1 and its g tor calculated

arallel-projec et al. predict pecimens we eometric par by Eq. 8 [10

it is 344.00 his is the fati into flat pla analytic stre

24.13  MPa gue limit use tes as shows ss concentra

[7]. d in the tion

2

3

a

2 a c      

  

  

2

(8)

t K 

3.

065 3.370 

0.658



c

Figure

1 : Flat plate sp

ecimen.

K t

a (mm)

b (mm) c ( 80.00 3 80.00 3 80.00 3 Table 4 : S nded by man iological assa n other word a living orga ortion of spe tical properti oth approach nd Weibull, edictions tha le [18]. It use nitially, the f e. If the spec erwise, a new the experime rements are

mm) d (mm 0.00 7.50 0.00 7.50 0.00 7.50 pecimen geom y standards [ y. Biologica s, it is basica nism [14]. In cimens survi es of fatigue es are based respectively. n Zhang-Ke s a simple sy atigue limit imen fails be test will be nt continues usually cons

) e (mm) 160.00 160.00 160.00 etric data.

Net area (m 105.00 150.00 180.00

m 2 )

2.4 2.0 1.5

2 4 5

3.00 5.00 8.00

Sta Th His alte obs stre Tw Mo dis pro wo Th init thr wil dep inc

ircase method e Staircase m torically, its rnative but s erving the re ss or dose, f o methods o od [15] and tribution of t vides better rk. e DM metho ial stress for ough of Para l be tested at ends on the reased or dec

ethod has be origin is ass imilar biolog action that i or that an acc f data reduct Zhang-Kecec he fatigue lim and more co d was popul a specific f llel-projected a lower stre previous tes reased [17].T

en recomme ociated to b ical stimuli. I s produces in eptable prop ion for statis ioglu [16]. B it, Normal a nservative pr arized by Litt atigue life. I or S-N curv ss level. Oth t results and he stress inc

11-13] to eva l assay is a lly the measu both cases, ves. strength at a on maximum According to cecioglu meth stematic me and its stand fore to infini conducted a in this mann tant and are

luate the fatig set of techni rement of th one want to specific fatig likelihood Lin [17], the od (ZK). Th thodology wh ard deviatio te life (say 2· t upper stres er in sequen in the range

ue limit stati ques used in e potency of determine th ue life are m estimation an Dixon-Moo erefore it wi ere the spec n are estima 10 6 cycles), th s level. In th ce with the of half to tw

stical proper comparison any stimulu e level stimu ost used: Dix d assume ta d method (D ll be used in imen is teste te, for exam e next specim at way, each stress level b ice the stand

ties. of s by lus, on rget M) this d at ple, en test eing ard

38