Consideration of Fatigue Crack Growth Aspects in the Design and Assessment of Railway Axles

Varfolomeev, Igor; Luke, Michael

doi:10.1007/978-3-319-21467-2_5

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…Graphs of the dependences a(N) (15) were obtained: they prove that found parameters optimally describe the process of crack growth, Fig. ) the discrepancy with the experimental results increases.…”

Section: визначення характеристик зростання втомних тріщин в осях зал...mentioning

confidence: 63%

“…0 − = r. That shows a significant correlation between the parameters m and logC.In determining the residual life of railway axles with diameter mm 160 > D made of the considered steel EA4T, the exponent m should be assigned and the coefficient C should be found from formula(17). If the stress σ that arises in axle operation is known and a surface crack with its depth a 0 is detected, then the residual life of the axle can be assessed using the formula obtained from dependence(15)…”

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confidence: 99%

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Determination of Characteristics of Fatigue Cracks Growth in the Axles of Railway Carriages

Khomiak,

Kibakov,

Gerasymov

2023

МіСАПР

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Providing damage resistance is the most important requirement presented to railway axles. This paper provides a detailed review of the characteristics of resistance to fatigue crack growth in axles made of EA4T steel (25CrMo4). This steel is typical for axles of high-speed rolling stock. Resistance to fatigue crack growth is defined by the nature of the Paris-Erdogan curve da/dN=CKm, the parameters of which are the coefficient C and the exponent m. Determination of these parameters is based on the results of fatigue tests with the samples or with full-scale axles having cracks. The analysis of numerous scientific papers has shown that for the specified steel there is a significant scatter in the values of these parameters. This scatter is caused by a number of factors, the main of which are: the difference in test objects (from small samples of the SE(B) type to full-scale rolling axles 190 mm in diameter); the difference in loading methods (tension-compression, flat bending, circular bending); the variation of mechanical properties of EA4T steel. In the paper the models of surface fatigue crack geometry are analyzed and semi-elliptical shape of crack front line is selected as the most acceptable. The significant scatter in the values of the parameters m and C prevents to establish reliably the residual life of axles with cracks, which is an important characteristic for practical forecasting of axle survivability. The technique for parameters m and C optimization in view of semi-elliptical shape of the crack front line has been developed. The relationship linking the parameters m and C has been established. The method for determining the residual life of the axle by the criterion of non-destruction is proposed. The dependence between the residual life and the value of the parameters of the Paris-Erdogan equation in the development of fatigue failure is established. The procedure for axles monitoring timeframes setting to prevent their fatigue failure is discussed. Keywords: parameters of Paris-Erdogan equation, fatigue crack, residual life of axle.

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Section: визначення характеристик зростання втомних тріщин в осях зал...mentioning

confidence: 63%

mentioning

confidence: 99%

Determination of Characteristics of Fatigue Cracks Growth in the Axles of Railway Carriages

Khomiak,

Kibakov,

Gerasymov

2023

МіСАПР

View full text Add to dashboard Cite

show abstract

“…The cumulative density function of crack initiation is given later together with the results of the results of lifetime analysis. Fracture mechanics for railway axles are subject of current research [54,108]. Here the fracture mechanical simulations are accomplished by the simulation program ERWIN from the Fraunhofer Institute IWM in Freiburg, Germany [34].…”

Section: Lifetime Of Railway Axlesmentioning

confidence: 99%

12 Model order reduction and digital twins

2020

Applications

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Numerical modelling of a new FCP model and a correlation of the FCP rate with the constraint

Yang

Guo

et al. 2022

International Journal of Fatigue

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Consideration of Fatigue Crack Growth Aspects in the Design and Assessment of Railway Axles

Cited by 3 publications

References 22 publications

Determination of Characteristics of Fatigue Cracks Growth in the Axles of Railway Carriages

Determination of Characteristics of Fatigue Cracks Growth in the Axles of Railway Carriages

12 Model order reduction and digital twins

Numerical modelling of a new FCP model and a correlation of the FCP rate with the constraint

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