Effect of stress ratio on fatigue crack growth in a titanium aluminide alloy

Parida, BK; Nicholas, T.

doi:10.1007/bf00034910

Cited by 20 publications

(6 citation statements)

References 2 publications

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“…However, according to others experimental data and prediction of regionⅡwith the method of Paris formula, the ideas that some viewpoints in papers show that m is material constant and the fatigue crack propagation threshold of the same material is the same is not consistent with the actual experimental results. It is obvious that the slope of R=0.1 of region Ⅱ has a little difference from the slope of R=0.5 and 0.7.The paper [1] also shows the other experimental data, namely C(T) specimens [16]. In those data, it is clear that the value of m of R=0.8 of region Ⅱ has much difference from the value of m of R=0.5 and R=0.1.…”

Section: Discussionmentioning

confidence: 71%

“…The experimental data shown in Fig. 1 is from B.K.Parida and T.Nicholas [1] and Ti-24Al-11Nb is used, so this paper sets this material as an example. Based on the Paris formula, an improved formula can be derived mechanically to present the influence of stress ratio on fatigue crack propagation.…”

Section: Improved Formula Of Fatigue Crack Growth Ratementioning

confidence: 99%

“…This paper mainly aims to find the effect of stress ratio on the fatigue crack propagation through the experimental data. Based on the experimental data from B.K.Parida and T.Nicholas [1], an improved formula of fatigue crack growth in region Ⅱ(the expansion region) is derived.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Stress Ratio on Fatigue Crack Propagation in TiAl Alloy

Feng

Rui

Zuo

et al. 2013

AMM

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Based on the experiments did by B.K.Parida and T.Nicholas [1], the fatigue crack propagation rate of TiAl alloy under different stress ratios had been tested in order to find out the role of stress ratio and to derive an improved fatigue crack propagation formula for region II(the expansion region) according to Paris formula and to calculate the specific values of the constants in the formula. The experimental results reveal that stress ratio has a significant influence on fatigue crack growth rate.

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Section: Discussionmentioning

confidence: 71%

Section: Improved Formula Of Fatigue Crack Growth Ratementioning

confidence: 99%

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Influence of Stress Ratio on Fatigue Crack Propagation in TiAl Alloy

Feng

Rui

Zuo

et al. 2013

AMM

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“…By correlation, it is meant that a “consolidation” of data into a single crack growth curve occurs, when plotted in a crack driving force parameter that embeds the stress ratio in it. Yuen et al, Sullivan and Crooker, and Parida and Nicholas also proposed different empirical forms of parameters, each having varied combinations of ∆ K and K max , to correlate the fatigue crack growth. However, none of these approaches provide a physically based derivation of the forms proposed.…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack growth in bending: Successful correlation of mean stress (stress ratio) effects using the change in net‐section strain energy

Chandran

2018

Fatigue Fract Eng Mat Struct

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A physically based correlation of mean stress (or stress ratio) effects, during fatigue crack growth in bending, is demonstrated using the concept of the change in net‐section cyclic strain energy. This study extends the net‐section approach, which was successfully demonstrated previously for middle‐cracked tension specimens, here to bending. A straightforward analytical derivation of the change in net‐section cyclic strain energy is shown using the mechanics of beam bending. Using experimental data, it is shown that the change in net‐section cyclic strain energy successfully correlates the effect of mean stress on fatigue crack growth rates for a steel, an aluminium alloy, a titanium alloy, and a WC‐Co cermet. It is also shown that the net‐section‐based stress intensity factor, morphed from the change in net‐section strain energy, agrees excellently with the fracture mechanics‐based stress intensity factor. This is to show that the proposed net‐section‐centric fracture mechanics approach for fatigue is physical and that the origin of fracture mechanics stress intensity factor appears to be actually rooted in the change in the net‐section strain energy. Hence, the net‐section‐centric approach appears to be superior to the crack‐centric conventional fracture mechanics approach, and a physical treatment of the fatigue crack growth behaviour appears to be possible.

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“…The fatigue crack propagation rate is affected by many factors, such as temperatures, environment, stress ratio, microstructure and Experiments preformed by A.H.Rosenberger [5] has found the influence of environment on fatigue crack growth of γ-TiAl alloys. B.K.Parida et al [6] has found the influence of stress ratio on fatigue crack growth of TiAl alloys. Similar stress ratio effects were found by FENG Ruicheng et al [7].…”

Section: Introductionmentioning

confidence: 99%

Influence of Microstructure and Stress Ratio on Fatigue Crack Propagation in TiAl Alloy

Zuo

Rui

Feng

et al. 2014

AMR

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Based on the fatigue crack propagation experiments did by A.-L. Gloanec et al., the fatigue crack propagation rates of TiAl alloy of two processing routes, namely casting and PM, and stress ratios had been tested, in order to find out the effects of microstructure and stress ratio. An improved fatigue crack propagation formula for region Ⅱ (the expansion region) was derived according to Paris formula. The specific values of the constants in the formula were calculated. Fatigue crack propagation resistance of nearly fully lamellar microstructure is superior to that of equiaxed γ grain. The experimental results present that both microstructure and stress ratio has a significant influence on fatigue crack growth rate.

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Effect of stress ratio on fatigue crack growth in a titanium aluminide alloy

Cited by 20 publications

References 2 publications

Influence of Stress Ratio on Fatigue Crack Propagation in TiAl Alloy

Influence of Stress Ratio on Fatigue Crack Propagation in TiAl Alloy

Fatigue crack growth in bending: Successful correlation of mean stress (stress ratio) effects using the change in net‐section strain energy

Influence of Microstructure and Stress Ratio on Fatigue Crack Propagation in TiAl Alloy

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