Effect of temperature and notch geometry on the tensile behavior of a titanium alloy

Jenkins, William D.; Willard, William A

doi:10.6028/jres.070c.003

Cited by 6 publications

(10 citation statements)

References 1 publication

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“…16 at the nominal stresses of 50 and 500 MPa. The peak value of 11 Optical micrograph taken at unfractured notch section at 298 K: notch root radius is 0?5 mm Triaxiality factor (TF) is defined as the ratio of hydrostatic stress to Von Mises equivalent stress and is given as TF~(s 1 zs 2 zs 3 )=3s eq (5) It is the indicator of degree of constraint imposed by the notch by means of developing triaxial stress state in the notch region. 17,18 The variations of triaxiality factor across the notch section at the nominal stresses of 50 and 500 MPa are shown for various notch radii in Fig.…”

Section: Fea Resultsmentioning

confidence: 99%

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Effect of notch root radius on tensile behaviour of 316L(N) stainless steel

Kumar

Nandagopal

Laha

et al. 2014

Materials at High Temperatures

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Type 316L(N) stainless steel (SS) is used as the major structural material for high temperature components of sodium cooled fast reactors. The influence of notch root radius on the tensile behaviour of 316L(N) SS under multi-axial stress state was investigated. Double U-notches with five different kinds of notch geometry were incorporated symmetrically into the tensile testing specimens by changing the notch root radius while keeping the gross diameter, net diameter and notch depth as the same for all the notches. The notch root radius was varied as 0?25, 0?5, 1?25, 2?5 and 5 mm. Tensile tests were carried out on the notched specimens at room temperature (298 K) and at 923 K at a constant strain rate of 3610 23 s 21 . The tensile strength and yield strength of notched specimen of 316L(N) SS increased with decrease in notch radius at both the temperatures and the notch severity was less pronounced at high temperature. The fractured notch surface was analysed using scanning electron microscope and unfractured notch was sliced along the axis and observed under optical microscope. Finite element analysis was performed on the models of notched specimens with various notch root radii. These results showed that Von Mises equivalent stress which was derived from triaxial stresses decreased with decrease in notch radius. The shift of location of peak values of maximum principal stress and hydrostatic stress towards the axis of the specimen, leading to formation of cracks, occurred at a lower nominal stress when the notch radius was increased.

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Section: Fea Resultsmentioning

confidence: 99%

“…Yield strength, tensile strength and true stress at fracture of a duplex annealed Ti8Al1Mo1V alloy increased with increase in notch depth and decrease in notch angle. 5 Toribio 6 used two notches with different radii to analyse the influence of the stress state in the vicinity of the notch tip on hydrogen embrittlement.…”

Section: Introductionmentioning

confidence: 99%

Effect of notch root radius on tensile behaviour of 316L(N) stainless steel

Kumar

Nandagopal

Laha

et al. 2014

Materials at High Temperatures

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“…This alloy was selected for th e research as it is one of the candida te materials for aerospace applications in components used at intermedi ate tempera tures (up to 1000 OF ) . Furthermore, its shorttime tensile notch behavior a nd lon g-time creep properti es on unnotched cylindri cal specimens have been ex tensively investigated at the National Bureau of Standards [3,6] .…”

Section: Material Specimens and Experimental Proceduresmentioning

confidence: 99%

Effect of notch geometry and temperature on the creep-rupture behavior of a titanium alloy

Jenkins¹,

Willard²

1970

J. RES. NATL. BUR. STAN. SECT. C. ENG. INSTR.

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Creep-rupture tests were made on circumferentially notched Ti-8Al-IMo-IV specimens at temp eratures of 600 , 800, 1000, and 1200 of (588, 699, 811, and 921 K) with stresses to produce rupture times ranging from 1 min to several thousand hours. A comp rehensive study was made to determine th e effe cts of notch geometry (an gle, depth, root radius ) on creep, rupture , and ductility characteristics of the alloy. Althou gh a limited first sta ge and well-defin ed second and third stages of creep were observed, neither rupture tim es nor reduction of area values were predictabl e from exte nsion-time behavior. Rupture tim e and ductility appea red to be affected more by the initial root radius at the ba se of th e notch than by notch depth. Diffe rences in mechanical behavi or between specimens of diffe rent notch geom etries were less as th e temperature was increased or th e stress decreased. A li mited number of tests indi cated that prior strain history had a ma rked effec t on subsequ ent creep-rupture behavior at 1000 of.Relative amounts of alpha and beta constituents, th e number of observed internal c racks, and the mode of fracture were affected by notch geometry and test temperatures.

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“…The test specimens we re pre pared from bars obtained from the same heat as that used in a previous researc h program to evaluate the effects of notch geometry on the tensile behavior of this alloy [3]. The bars were cut into lengths , each about 6.5-in and annealed at 1750 O F (1226 OK) for 1 hr and aircooled.…”

Section: Materials and Testing Proceduresmentioning

confidence: 99%

“…= rupture tim e (2) (2a) cr = creep s tress n, nl , A, S , A I, a nd BI = co ns tant s whic h are d e pe nde nt on te mpera ture. ~s = A exp (Bcr) (3) a nd (3a)…”

Section: Extension-time Relations For Specimens Tested At 1200 Ofmentioning

confidence: 99%

Creep rupture properties of Ti-8Al-1Mo-1V alloy

Jenkins¹,

Willard²

1968

J. RES. NATL. BUR. STAN. SECT. C. ENG. INSTR.

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Creep tests were made at 600, BOO, lOOO , and 1200 O F (5BB, 699, Bll, and 921 O K) on duplex-annealed Ti-BAl-lMo-l V alloy specim ens. Creep-test co ndition s we re selected to produce creep rates ranging from 0.1 10 50,000 pe rce nt per 1,000 hours and rupture times ranging from 0.1 to about 10,000 hours. Conformance of th e tes t data to creep theories was obtained over a limited range of stress, strain, creep rate and temperature_ C reep behavior was influ enced by microstru ctural c han ges durin g creep and by prior thermal-mec hanical treatment. Engineering-design curves are included in thi s pape r.

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Effect of temperature and notch geometry on the tensile behavior of a titanium alloy

Cited by 6 publications

References 1 publication

Effect of notch root radius on tensile behaviour of 316L(N) stainless steel

Effect of notch root radius on tensile behaviour of 316L(N) stainless steel

Effect of notch geometry and temperature on the creep-rupture behavior of a titanium alloy

Creep rupture properties of Ti-8Al-1Mo-1V alloy

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