On the use of critical distance theories for the prediction of the high cycle fatigue limit stress in notched Ti?6Al?4V*1

Lanning, David; Nicholas, T.; Haritos, George

doi:10.1016/j.ijfatigue.2004.06.002

Cited by 109 publications

(48 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lastly, titanium alloys, in particular of the (α+β) and β types, is more tolerant than steels under the identical σ/E ratio. This is in sharp contrast with the generally accepted viewpoint that titanium alloys, especially (α+β) type alloys, are more sensitive to notch [27,40].…”

Section: Figurecontrasting

confidence: 86%

“…They show clearly that its fatigue limit decreases as the stress concentration factor K t increases at the same stress ratio R and increases with the increased R at the same K t . Both are normal in tendency with the conventional metallic materials [27]. The S-N curves of Ti-6Al-4V alloy are given in Fig.…”

Section: Notch Fatigue Propertiesmentioning

confidence: 79%

“…It should be noted that the fatigue notch sensitivity q is variable with both K t and R. Since these selected data under R=−1 in refs. [14,27,[29][30][31][32][33][34][35][36][37][38][39][40][41][42] were measured with different K t , the q under the identical condition of K t =4 (Fig. 8) has to be calculated by the Kuhn-Hardrath equation [25]:…”

Section: Comparison Of Fatigue Notch Properties With Other Metallic Mmentioning

confidence: 99%

“…Comparing fatigue notch sensitivity and strength-modulus ratio of Ti2448 alloy with other metallic materials, including Mg alloys [30], Al alloys [31][32][33], Ti alloys [27,29,[34][35][36][37][38] and steels [14,[39][40][41][42]. modulus β type biomedical titanium alloys are potential for load-bearing applications to ensure long-term service safety because they are tolerant to notch, as evidenced by the decreased q of the α, (α+β) and β type alloys under the identical σ/E ratio.…”

Section: Figurementioning

confidence: 99%

See 3 more Smart Citations

Weak fatigue notch sensitivity in a biomedical titanium alloy exhibiting nonlinear elasticity

et al. 2017

View full text Add to dashboard Cite

It is well known that metallic materials exhibit worse fatigue damage tolerance as they behave stronger in strength and softer in modulus. This raises concern on the long term safety of the recently developed biomechanical compatible titanium alloys with high strength and low modulus. Here we demonstrate via a model alloy, Ti-24Nb-4Zr-8Sn in weight percent, that this group of multifunctional titanium alloys possessing nonlinear elastic deformation behavior is tolerant in fatigue notch damage. The results reveal that the alloy has a high strength-to-modulus (σ/E) ratio reaching 2% but its fatigue notch sensitivity (q) is low, which decreases linearly from 0.45 to 0.25 as stress concentration factor increases from 2 to 4. This exceeds significantly the typical relationship between σ/E and q of other metallic materials exhibiting linear elasticity. Furthermore, fatigue damage is characterized by an extremely deflected mountain-shape fracture surface, resulting in much longer and more tortuous crack growth path as compared to these linear elastic materials. The above phenomena can be explained by the nonlinear elasticity and its induced stress relief at the notch root in an adaptive manner of higher stress stronger relief. This finding provides a new strategy to balance high strength and good damage tolerance property of metallic materials.

show abstract

Section: Figurecontrasting

confidence: 86%

Section: Notch Fatigue Propertiesmentioning

confidence: 79%

Section: Comparison Of Fatigue Notch Properties With Other Metallic Mmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

See 2 more Smart Citations

Weak fatigue notch sensitivity in a biomedical titanium alloy exhibiting nonlinear elasticity

et al. 2017

View full text Add to dashboard Cite

show abstract

“…[1], Lanning et al [13] and Naik et al [15] on Ti-6Al-4V for various notch root geometries and stress ratios. The Ti-6Al-4V specimens used in these papers were obtained from forged bar, which were initially heat treated to 705˚C for 2 h, and then followed by static argon cooling to below 149˚C.…”

Section: Materials Systemsmentioning

confidence: 99%

Application of Weakest Link Probabilistic Framework for Fatigue Notch Factor to Turbine Engine Materials

Okeyoyin¹,

Owolabi²

2013

WJM

View full text Add to dashboard Cite

This paper is concerned with the extension of a recently developed probabilistic framework based on Weibull's weakest link and extreme-value statistics to aero-engine materials like titanium alloy and nickel-base super alloys using simulation strategies that capture both the essence of notch root stress gradient and the complexity of realistic microstructures. In this paper, notch size effects and notch root inelastic behavior are combined with probability distributions of microscale stress-strain gradient and small crack initiation to inform minimum life design methods. A new approach which can be applied using crystal plasticity finite element or closed-form solution is also proposed as a more robust approach for determining fatigue notch factor than the existing classical methods. The fatigue notch factors predicted using the new framework are in good agreements with experimental results obtained from literature for notched titanium alloy specimens subjected to uniaxial cyclic loads with various stress ratio.

show abstract

Ti6Al4V laser surface preparation and functionalization using hydroxyapatite for biomedical applications

et al. 2017

View full text Add to dashboard Cite

This work presents a novel texture design for implants surface functionalization, through the creation of line-shaped textures on Ti6Al4V surfaces and subsequent sintering of hydroxyapatite (HAp) powder into the designated locations. HAp-rich locations were designed to avoid HAp detachment during insertion, thus guaranteeing an effective osseointegration. This process starts by creating textured lines using a Nd:YAG laser, filling these lines with HAp powder and sintering HAp using a CO laser. The adhesion of HAp is known to be influenced by HAp sintering parameters, especially laser power and scanning speed and also by the textured lines manufacturing. Different laser parameters combinations were used to assess the sintering and adhesion of HAp to the textured lines. HAp adhesion was assessed by performing high energy ultrasonic cavitation tests and sliding tests mimicking an implant insertion, with Ti6Al4V/HAp specimens sliding against animal bone. The HAp content retained after these tests was measured and results showed that an excellent HAp sintering and adhesion was achieved when using a scan speed of 1 mm/s and laser power between 9 and 9.6 W. It is important to emphasize that results indicated that the HAp bioactivity was maintained when using these conditions, validating this functionalization process for the production of hip prosthesis with improved bioactivity. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 1534-1545, 2018.

show abstract

On the use of critical distance theories for the prediction of the high cycle fatigue limit stress in notched Ti?6Al?4V*1

Cited by 109 publications

References 17 publications

Weak fatigue notch sensitivity in a biomedical titanium alloy exhibiting nonlinear elasticity

Weak fatigue notch sensitivity in a biomedical titanium alloy exhibiting nonlinear elasticity

Application of Weakest Link Probabilistic Framework for Fatigue Notch Factor to Turbine Engine Materials

Ti6Al4V laser surface preparation and functionalization using hydroxyapatite for biomedical applications

Contact Info

Product

Resources

About