Fatigue assessment of EA4T railway axles under artificial surface damage

Gao, Jie-Wei; Dai, Guangze; Li, Qiuze; Zhang, Min-Nan; Zhu, Shun‐Peng; Correia, José A.F.O.; Lesiuk, Grzegorz; Jesus, Abílio M.P. De

doi:10.1016/j.ijfatigue.2021.106157

Cited by 29 publications

(13 citation statements)

References 36 publications

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“…The fitting of the cyclic R-curve will be presented in Section 4.2. [42]) and comparison with the available data in literature [40] and (b) crack growth curves and interpolation with the Nasgro equation.…”

Section: Fatigue Crack Propagation Tests Resultsmentioning

confidence: 99%

“…Semi-elliptical artificial defects with initial depth a = 1.5 mm and aspect ratio a/c = 0.8 were introduced by electrical discharge machining (EDM), being c the superficial crack length. The semi-elliptical shape is dictated by the type of damage that is typically promoted by the impact of foreign objects, as shown and discussed also in the literature [1,2,42]. The dimensions, instead, are determined by the minimum detectable defect size of the employed non-destructive methodology [43] together with the statistics obtained in the RSSB T728 project [2].…”

Section: Specimens and Test Details Of Full-scale Axle Testsmentioning

confidence: 99%

“…Figure 5. Fatigue crack growth characterization of the present EA4T steel: (a) Evaluated Rdependence of long crack thresholds ∆K th,lc (values acquired from[42]) and comparison with the available data in literature[40] and (b) crack growth curves and interpolation with the Nasgro equation.…”

mentioning

confidence: 99%

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Investigation of Fatigue Crack Growth in Full-Scale Railway Axles Subjected to Service Load Spectra: Experiments and Predictive Models

Pourheidar

Patriarca

Beretta

et al. 2021

Metals

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In this paper, a series of experimental investigations was performed on full-scale railway axles to analyze the fatigue crack growth behavior of EA4T steel under load spectrum derived from real operating conditions. The experimental results were compared to life predictions carried out adopting two models: (i) the conventional Nasgro equation and (ii) the cyclic R-curve concept implemented in the Modified Nasgro equation for describing the crack growth behavior of an arbitrary crack length. The results show that the life predictions performed by means of the Modified Nasgro equation coincide well with the experimental results with an underestimation of the residual lifetime less than 32%, while the traditional Nasgro equation leads to significant overestimation (≈120%) of the residual lifetime for load spectra close to the in service scenario.

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Section: Fatigue Crack Propagation Tests Resultsmentioning

confidence: 99%

Section: Specimens and Test Details Of Full-scale Axle Testsmentioning

confidence: 99%

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Investigation of Fatigue Crack Growth in Full-Scale Railway Axles Subjected to Service Load Spectra: Experiments and Predictive Models

Pourheidar

Patriarca

Beretta

et al. 2021

Metals

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“…, 2009), the effect of composite impact and cyclic loading on the overall fatigue life of forged steel was studied. The properties of forged steel, EA4T, under combined impact-cyclic loading are studied (Gao et al. , 2021a, b, c).…”

Section: Metal Materials Under Impact Loadsmentioning

confidence: 99%

Evaluation and prediction of material fatigue characteristics under impact loads: review and prospects

Liu

et al. 2022

IJSI

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PurposeThe properties of materials under impact load are introduced in terms of metal, nonmetallic materials and composite materials. And the application of impact load research in biological fields is also mentioned. The current hot research topics and achievements in this field are summarized. In addition, some problems in theoretical modeling and testing of the mechanical properties of materials are discussed.Design/methodology/approachThe situation of materials under impact load is of great significance to show the mechanical performance. The performance of various materials under impact load is different, and there are many research methods. It is affected by some kinds of factors, such as the temperature, the gap and the speed of load.FindingsThe research on mechanical properties of materials under impact load has the characteristics as fellow. It is difficult to build the theoretical model, verify by experiment and analyze the data accumulation.Originality/valueThis review provides a reference for further study of material properties.

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“…

σ_{e}

is the smooth sample endurance limit, and

normalΔ K_{th, lc}

is the threshold value for the long crack propagation in the material.

\sqrt{area}

of the damage projection area 31,32 and maximum damage depth are taken as the crack size

a_{0}

, and the definition of

italicarea

is shown in Figure 14.…”

Section: Fatigue Strength Predictionmentioning

confidence: 99%

Foreign object damage characteristics and their effects on high cycle fatigue property of Ni‐based superalloy GH4169

Zhang

Chen

et al. 2022

Fatigue Fract Eng Mat Struct

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In this study, high‐speed ballistic impact tests were conducted on GH4169 alloy samples with the aeroengine compressor blade leading‐edge feature to simulate the notch‐type foreign object damages (FOD). Macroscopic and microscopic characterization of FOD and high cycle fatigue tests were performed to investigate the effect of FOD depth on GH4169 alloy fatigue strength along with numerical analysis using the Kitagawa–Takahashi diagram. Results show that the incident side of notch‐type FODs is relatively smooth, whereas the exit side is rugged. The FOD depth ranges from 0.18 to 1.33 mm, and the fatigue strength of damaged samples is 37.93% – 97.04% of the undamaged samples. As the FOD depth increases, damage length, material losses, and the stress concentration coefficient of the FOD increase significantly and accompanied by the increasing of adiabatic shear bands, micro voids, and cracks, resulting in fatigue strength reduction. Numerical analysis indicates that the Kitagawa–Takahashi diagram can provide a basic model for the design of FOD tolerance.

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Fatigue assessment of EA4T railway axles under artificial surface damage

Cited by 29 publications

References 36 publications

Investigation of Fatigue Crack Growth in Full-Scale Railway Axles Subjected to Service Load Spectra: Experiments and Predictive Models

Investigation of Fatigue Crack Growth in Full-Scale Railway Axles Subjected to Service Load Spectra: Experiments and Predictive Models

Evaluation and prediction of material fatigue characteristics under impact loads: review and prospects

Foreign object damage characteristics and their effects on high cycle fatigue property of Ni‐based superalloy GH4169

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