Modeling the fatigue crack growth behavior of Ti-6Al-4V by considering grain size and stress ratio

Oberwinkler, Bernd

doi:10.1016/j.msea.2011.04.046

Cited by 42 publications

(14 citation statements)

References 20 publications

(22 reference statements)

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“…The results in Figure B indicated that the fatigue crack resistance of the threshold region was not only influenced by the build orientation but also by the stress ratio. Some researchers have concluded that the value of Δ K th was more sensitive to the stress ratio, which could be attributed to the mean stress and microstructure . In general, the fatigue crack threshold decreased with the increase of R. Compared with Figure B, the increase in striation distance was clearer in Figure F, and this was assumed as an indicator of a higher rate of FCG for higher stress ratios.…”

Section: Resultsmentioning

confidence: 92%

“…Some researchers have concluded that the value of ΔK th was more sensitive to the stress ratio, which could be attributed to the mean stress and microstructure. 29,30 In general, the fatigue crack threshold decreased with the increase of R. Compared with Figure 7B, the increase in striation distance was clearer in Figure 7F, and this was assumed as an indicator of a higher rate of FCG for higher stress ratios. Meanwhile, the density of the ridges in Figure 7F declined, when compared with Figure 7B, resulting in smoother crack surfaces at low magnification scales ( Figure 7E).…”

Section: Fcg Behaviour In the Near Threshold Regionmentioning

confidence: 84%

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On the fatigue crack growth behaviour of selective laser melting fabricated Inconel 625: Effects of build orientation and stress ratio

Zhang

Ren

et al. 2020

Fatigue Fract Eng Mat Struct

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The building of Inconel 625 material was carried out using the selective laser melting method, and its fatigue crack growth property at ambient temperature was experimentally investigated. Compact‐tension specimens with different building orientations were utilized to determine the stress intensity factor threshold and fatigue crack growth rate curves at different stress ratios (R). The results indicated that the fatigue crack growth properties in the near threshold stress intensity factor and Paris regions were greatly affected by the loading factor, as well as the orientation of the alloy. The mechanism of fatigue crack growth at different stages was observed and discussed using scanning electron microscopy. Finally, based on the framework of the linear elastic fracture, a new and applicable effective driving force factor range was introduced to replace the traditional stress intensity factor range (ΔK) with good accuracy for all of the fatigue crack growth test data, considering both the stress ratio and orientation.

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Section: Resultsmentioning

confidence: 92%

Section: Fcg Behaviour In the Near Threshold Regionmentioning

confidence: 84%

On the fatigue crack growth behaviour of selective laser melting fabricated Inconel 625: Effects of build orientation and stress ratio

Zhang

Ren

et al. 2020

Fatigue Fract Eng Mat Struct

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“…27 It was assumed here that the morphology of the surface crack was semicircular (ie, a = c), the interaction effects of adjacent cracks were negligible, and only the tensile portion of the stress was considered for specimens tested at negative R. 20 The variation of small crack growth rate with stress intensity factor range is shown in Figure 9. 32 In their study, both the PSC and LC growth rates of Ti-6Al-4V increased with increasing R. Nevertheless, experiments in Ti-6Al-4V performed by Caton and co-workers 20 showed similar result. This might be related to the fact that at R = −1, there were not only several major cracks, but also tens of micro cracks, which were scarcely found at other stress ratios.…”

Section: Effect Of Stress Ratio On Small Fatigue Crack Growth Ratementioning

confidence: 82%

Small fatigue crack growth behavior of titanium alloy TC4 at different stress ratios

Zhu

Jiang

et al. 2018

Fatigue Fract Eng Mat Struct

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In this paper, the small fatigue crack behavior of titanium alloy TC4 at different stress ratios was investigated. Single‐edge‐notch tension specimens were fatigued axially under a nominal maximum stress of 370 MPa at room temperature. Results indicate that fatigue cracks in TC4 initiate from the interface between α and β phases or within α phase. More than 90% of the total fatigue life is consumed in the small crack initiation and growth stages. The crack growth process of TC4 can be divided into three typical stages, ie, microstructurally small crack stage, physically small crack stage, and long crack stage. Although the stress ratio has a significant effect on the total fatigue life and crack initiation life at constant σmax, its effect on crack growth rate is indistinguishable at R = −0.1, 0.1, and 0.3 when crack growth rate is plotted as a function of ∆K.

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“…Therefore, da/dN would change weakly with grain size. For macroscopic crack propagating in metal with conventional grain sizes, a da/dN that is independent of grain size has been reported for many materials (Ref 4,8,24,25).…”

Section: Grain Size Effect On Fatigue Crack Stable Propagationmentioning

confidence: 86%

The Effect of Grain Size on Fatigue Crack Propagation in Commercial Pure Titanium Investigated by Acoustic Emission

Zhang

Shen

2015

J. of Materi Eng and Perform

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The effect of grain size on fatigue crack propagation and the corresponding acoustic emission (AE) characteristics of commercial pure titanium (CP-Ti) were investigated at room temperature. After a fourpoint bending fatigue testing, the fatigue features and AE source mechanisms were discussed, combined with microstructural and fractographic observations. The results showed that the increased grain size had little effect on the stable propagation rate of fatigue crack; however, a significant increase in the AE counts rate was observed. During crack stable propagation, the relationship between the AE counts rate and the fatigue stress intensity factor range was generally in accordance with the Pairs law, with the exception of some local fluctuations due to regional twin paling. While lenticular twins appeared dispersively along the crack, twin palings were observed occasionally at the edge of the crack. Twin paling occurrence was more frequent in the specimens with larger grains than in those with smaller grains. This suggests that twin discontinuously played a role in the fatigue process in this CP-Ti, and that the AE technique is sensitive to crack propagation and twinning events during fatigue.

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Modeling the fatigue crack growth behavior of Ti-6Al-4V by considering grain size and stress ratio

Cited by 42 publications

References 20 publications

On the fatigue crack growth behaviour of selective laser melting fabricated Inconel 625: Effects of build orientation and stress ratio

On the fatigue crack growth behaviour of selective laser melting fabricated Inconel 625: Effects of build orientation and stress ratio

Small fatigue crack growth behavior of titanium alloy TC4 at different stress ratios

The Effect of Grain Size on Fatigue Crack Propagation in Commercial Pure Titanium Investigated by Acoustic Emission

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