Fracture mechanics and scale effects in the fatigue of railway axles

Beretta, S.; Ghidini, A.; Lombardo, Franklin T.

doi:10.1016/j.engfracmech.2003.12.011

Cited by 88 publications

(52 citation statements)

References 11 publications

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“…Surface cracks in railway axles usually have a semi-elliptical shape (e.g. [3,13,21]). An example from a failure case is shown in Fig.…”

Section: Geometrymentioning

confidence: 99%

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An investigation on the influence of rotary bending and press fitting on stress intensity factors and fatigue crack growth in railway axles

Madia¹,

Beretta²,

Zerbst³

2008

Engineering Fracture Mechanics

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The present paper summarizes the results of fatigue crack growth investigations on a hollow railway axle which were performed as a joint research project between the Politecnico di Milano, Italy, and the GKSS Research Centre Geesthacht, Germany, in the frame of an ESIS-TC24 activity. Since no analytical K factors (SIF) solutions for semi-elliptical surface cracks in the S-transitions of railway axles were available, the first step in the research was to generate them for both reverse and rotary bending. The results were then used to investigate the effects of rotary bending and of the press fits at the wheel and gear on the fatigue crack growth and residual lifetime so as to provide essential input information for setting up inspection intervals. It was found that the effect of rotary bending, although existent, was rather moderate whereas the press fits had a large and detrimental effect.

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“…Surface cracks in railway axles usually have a semi-elliptical shape (e.g. [3,13,21]). An example from a failure case is shown in Fig.…”

Section: Geometrymentioning

confidence: 99%

“…The fatigue crack growth properties of A1N were extensively studied by the Authors (more details about the parameters and the testing procedure can be found in [6,21]). …”

Section: Fatigue Crack Growth Algorithmmentioning

confidence: 99%

An investigation on the influence of rotary bending and press fitting on stress intensity factors and fatigue crack growth in railway axles

Madia¹,

Beretta²,

Zerbst³

2008

Engineering Fracture Mechanics

Self Cite

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“…In a particular case studied here, i.e. an axle, which undergo forging at high deformations temperatures followed by machining and surface treatment, several factors may influence their fatigue strength under repeated bending loads [9][10][11][12]. However, this makes it very difficult to evaluate the individual effects of these factors.…”

Section: Introductionmentioning

confidence: 99%

“…However, this makes it very difficult to evaluate the individual effects of these factors. The foremost of these parameters are the crack characteristics including the size, morphology, geometry as well as the location of crack [9]. The presence of defects can lead to sudden failure of the axles even far below the static strength limit.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Failure Analysis of a Broken Railway Axle: Effects of Surface Defects and Inclusions

Alihosseini

Dehghani

2010

J Fail. Anal. and Preven.

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In the present work, the fatigue behavior of an axle was analyzed using modeling and experimental approaches. A failed axle was used for experimental studies. The experimental results were then analyzed in order to model and predict the fatigue life of axle. The three-dimensional finite element analysis was used to simulate the fatigue behavior of axle. The growth of a machining defect, 2 lm initial crack length, was simulated versus applied cycles. The changes in the stress intensity factor as a function of crack length were modeled as well. The model predicted that after about 5 9 10 8 cycles there was an abrupt increase in the crack length, reaching a critical value of about 65 mm at around N f = 5 9 10 9 cycles, indicating that the longer the crack, the higher its growth will be. The experimental results were then compared with the modeling predictions. It is shown that the latter are in a good agreement with the former. The results obtained in this study do give a basis for evaluation of single scratch or notch produced by improper machining.

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“…Such research is being performed in spite of the fact, that today's metallurgical technologies assure the content of non-metallic inclusions on the level required by corresponding technical standards (for example PN-64/H-04510, DIN 50 602, and ASTM E45-97 standards) [5]. Despite the fact, that many research works [6][7][8] describe the role of nonmetallic inclusions in initiation of cracking or in fatigue wear [8][9][10], there is still a need to investigate the relation between non-metallic inclusions content and parameters describing the impact energy of steels, independent of notch geometry (for example in the case of the samples for impact energy testing). Such research is also important for the sake of verification of the proposed theories of the influence of non-metallic inclusions on the properties of steels [11,12] and numerical models based on these theories [13].…”

Section: Introductionmentioning

confidence: 99%

THE EFFECT OF NON-METALLIC INCLUSIONS ON THE CRAK PROPAGATION IMPACT ENERGY OF TOUGHENED 35B2+Cr STEEL

Krawczyk

Pawłowski

2008

mafe

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Fracture mechanics and scale effects in the fatigue of railway axles

Cited by 88 publications

References 11 publications

An investigation on the influence of rotary bending and press fitting on stress intensity factors and fatigue crack growth in railway axles

An investigation on the influence of rotary bending and press fitting on stress intensity factors and fatigue crack growth in railway axles

Modeling and Failure Analysis of a Broken Railway Axle: Effects of Surface Defects and Inclusions

THE EFFECT OF NON-METALLIC INCLUSIONS ON THE CRAK PROPAGATION IMPACT ENERGY OF TOUGHENED 35B2+Cr STEEL

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