Issue 14

B. L 36 H us Br Fed Bra lob A B hyd In com and and Mo lim fac to pre K E I N bri sen imp unn Ho val dec In tho ( iii ) T obato da Silva igh-cyc ed in h aitner Lob eral Universi sília, Brazil, atoae@gmail. STRACT . T raulic comp that sense, ponents w the consid 2.42. In o od, Stairca it. For such tor were co results obta diction of t YWORDS . N TRODUCTIO he fatigu these co invariab ttle materials sitivity to ge ortant trans otched spec wever, the m ue is practica rease quickly 1 f K   f S K S  the last 40 ye se considera Stress field et alii, Frattura le notc ydroge ato da Silv ty of Brasília, 70940-910. com.br, jorge@ he presenc onents is a specimens as tested. T ered stress rder to dete se method w geometry a mpared thro ined it was he Peterson otch, fatigu N e analysis in mponents a ly occur at st due to the f ometric disc formation fa imen, S fe . Th ost definitio lly unaffecte with respect   1 t q K  f fe ars many ex tions, they ca intensity mo ed Integrità Stru h sensi nator tu a, Jorge L Mechanical E unb.br, alex e of notche current pro of the AS he specimen concentratio rmine the f as used. T t least 8 spe ugh fatigue possible to and Neube e strength, turbine blad re designed ress concent atigue. Ther ontinuities. I ctor that rel is relation c n accepts is d for 10 6 to the cycle nu pressions hav n be classifie dels [2]. In tturale, 14 (201 tivity of rbine c uiz de Alm ngineering D 07@unb.br s and othe blem in eng TM A743 s were test n factors, K atigue limit his approac cimens wer notch redu conclude r’s empirical staircase me es and other to operate b rators. In th efore, the str n that sense ates the fati an be expres the relation 10 8 cycles. In mber [1]. e been deve d in three m this work, w 0) 36-44; DOI: alloy s ompon eida Ferr epartment, Ca r stress co ineering. It CA6NM a ed under un t , values, c for such no h is based e tested. In ction factor that the tes models. thod, up an hydraulic no elow its en e cases that t ess concentr , appears th gue strength sed by Eq. 1 showed by E addition, w loped to the odels: ( i ) Av e work onl 10.3221/IGF-ESI teel AST ents eira, José mpus Univer ncentration causes a re lloy steel u iaxial fatigu alculated wi tch type, a on the assu addition, th , K f , obtain ted materia d down met tch compon durance limi he loading is ation factor e fatigue not of notch sp , where q is q. 2. Exper hen the fatig notch fatigu erage stress m y with avera S.14.04 M A74 Alexander sitário Darcy s in turbin duction of e sing in sev e loading w th respect t reduction d med target e Peterson a ed from exp l is less sen hod, ASTM ents is a ver t and becau dynamic, th should be m ch reduction ecimen, S f , the notch s imental inve ue life is les e notch redu odels, ( ii ) F ge stress mo 3 CA6N Araújo Ribeiro, e blades an ndurance li eral hydrog ith a load ra o net area, ata method distribution nd Neuber erimental d sitive to no A743 CA6N y important p se fatigue fa e ductile ma odified accor factor, K f . with the fat ensibility fact stigations ind s that 10 6 cy ction factor, racture mech dels: Neube M d other no mit of mate enator turb tio equal to were 1.55, 2 by Dixon of the fati ’s notch fati ata. Accord tches than M. roblem beca ilures in ser terials behav ding to mat It establishes igue strength or and 0 q  icate that th cles, the K f v (1) (2) K f . Accordin anic models r and Peters tch rial. ine -1, .04 and gue gue ing the use vice e as erial an of 1  . e K f alue g to and on’s

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