The effect of stress ratio on the near-threshold fatigue crack growth behavior of Ti-8A1-1Mo-1V at elevated temperature

Salivar, G.C.; Heine, J.E.; Haake, F. K.

doi:10.1016/0013-7944(89)90177-x

Cited by 26 publications

(6 citation statements)

References 21 publications

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“…A C C E P T E D ACCEPTED MANUSCRIPT 15 As expected, the (via optical tracking obtained) crack propagation rate as function of the stress intensity factor is, within experimental error, independent of the initial crack length ( Figure 6a). …”

Section: A N U S C R I P Tsupporting

confidence: 77%

“…The compliance method is, therefore, popular, well accepted and widely applied to obtain the fracture toughness of metals [13][14][15][16] and ceramics. [6,17] Inspired by these excellent results, the method was adopted to determine fracture characteristics for other materials that are not linear elastic and isotropic, such as bone [18][19][20][21] and polymers, including reinforced [22,23] and nonreinforced thermoplastics, [24], which includes ultra-high molecular weight polyethylene [25,26] and polyethylene pipe grades.…”

Section: A N U S C R I P Tmentioning

confidence: 99%

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Direct comparison of the compliance method with optical tracking of fatigue crack propagation in polymers

2015

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Section: A N U S C R I P Tsupporting

confidence: 77%

Section: A N U S C R I P Tmentioning

confidence: 99%

Direct comparison of the compliance method with optical tracking of fatigue crack propagation in polymers

2015

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“…The experimental results to be presented are from the work of Haake et al [5] and Salivar et al [8,9] under contract with the U.S. Air Force. These data are particularly relevant to the high cycle fatigue problem since the material investigated, Ti-8AI-IMo-IV, is used extensively in fan and compressor blades in advanced military gas turbine engines.…”

Section: Fatigue Crack Initiation and Growth In Ti-8ai-1mo-ivmentioning

confidence: 99%

“…Near-threshold fatigue crack growth tests were performed on the Ti-8AI-IMo-IV alloy over a range of stress ratios in air at 260°C [5,8,9] using three procedures. The first method followed the standard practice for decreasing-AK, constant-R tests (AKth,dee) [11] and used compact tension, C(T), specimens.…”

Section: Fatigue Crack Growthmentioning

confidence: 99%

“…(It should be noted that Haake et al [5,8,9] have shown that the R = 0.7 data are equivalent to the closure-corrected da/dN -AKeff behavior of this material at R = 0.1, 0.5, and 0.7.) For purposes of illustration, an extrapolation of (1) up to the material's effective cyclic toughness is shown, and separate trend lines are plotted for da/dN v e r s u s / ( m a x -A plot of/k/(th as a function of R from the two specimen types is presented in Figure 6, along with values of AKth,eff for the C(T) tests, where AKeff --Kmax -Kcl.…”

Section: Fatigue Crack Growthmentioning

confidence: 99%

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An assessment of the role of near-threshold crack growth in high-cycle-fatigue life prediction of aerospace titanium alloys under turbine engine spectra

et al. 1996

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Increasingly accurate life prediction models are required to utilize the full capability of current and future advanced materials in gas turbine engines. Of particular recent interest are predictions of the lifetimes of engine airfoil materials that experience significant intervals of high-frequency, high-cycle fatigue (HCF). Conventional life management practices for HCF in the turbine engine industry have been based principally on a total-life approach. There is a growing need to develop damage tolerance methods capable of predicting the evolution and growth of HCF damage in the presence of foreign object damage (FOD), low cycle fatigue (LCF), and surface fretting fatigue.To help identify key aspects of the HCF life prediction problem for turbine engine components, a review is presented of the extensive results of an Air Force research contract with Pratt & Whitney on the high strength titanium alloy Ti-8AI-IMo-IV. Data from this representative turbine-airfoil material are used to examine the applicability of linear elastic fracture mechanics methods for prediction of service lifetimes under load spectra that include high cycle fatigue. The roles of fatigue crack initiation and growth are examined for materials that are nominally-defect-free, as well for materials that have experienced significant prior structural damage. An assessment is presented of the potential utility of the conventional threshold stress intensity factor range, AKth, defined by testing specimens containing large cracks. Although the general utility of a large-crack-AKth approach is questionable due to the potentially rapid growth of small fatigue cracks, the low allowable stresses involved in turbine engine high cycle fatigue appear to limit and simplify the small-crack problem. An examination is also presented of the potential effects of high-cycle fatigue and low-cycle fatigue (HCF/LCF) interactions.

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A comparison of test methods for the determination of fatigue crack growth rate threshold in titanium at elevated temperature

Salivar

Haake

1990

Engineering Fracture Mechanics

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The effect of stress ratio on the near-threshold fatigue crack growth behavior of Ti-8A1-1Mo-1V at elevated temperature

Cited by 26 publications

References 21 publications

Direct comparison of the compliance method with optical tracking of fatigue crack propagation in polymers

Direct comparison of the compliance method with optical tracking of fatigue crack propagation in polymers

An assessment of the role of near-threshold crack growth in high-cycle-fatigue life prediction of aerospace titanium alloys under turbine engine spectra

A comparison of test methods for the determination of fatigue crack growth rate threshold in titanium at elevated temperature

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