Effect of specimen geometry on fatigue crack growth rates for the railway axle material EA4T

Varfolomeev, Igor; Luke, Michael; Burdack, M.

doi:10.1016/j.engfracmech.2010.11.011

Cited by 52 publications

(19 citation statements)

References 28 publications

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“…The fatigue damage tolerance therefore takes into account not only the minimum crack size detectable using NDT methods but also suitable intervals between inspections, set depending on the location and period of operation. In addition to these basic design concepts, studies also focus on the effects of structural materials, surface treatments, methods of heat treatment and subsequent machining, and geometric parameters – particularly the effect of axle body diameter and wheel seat diameter on fatigue strength with a focus on high‐speed train axles . One technology applied to increase axle fatigue strength is surface induction hardening, which involves the relatively rapid heating of surface layers of pre‐machined axles up to the hardening temperature using an inductor, followed by the rapid cooling of the axle by a water jet positioned behind the inductor and also by the transfer of heat by the axle body.…”

Section: Introductionmentioning

confidence: 99%

Fatigue limit of induction hardened railway axles

Fajkoš

Zima

Strnadel

2015

Fatigue Fract Eng Mat Struct

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A B S T R A C T A new surface induction hardening technology was designed for the purpose of increasing the resistance of railway wheelsets to fatigue damage. This paper gives a detailed presentation of the technological aspects of induction hardening of axles. The increased fatigue resistance in hardened surfaces compared with standard heat treatment of EA4T steel was verified using tensile test specimens, press-fitted wheel seat/axle joints at 1:3 scale and press-fitted wheel/axle joints at actual size. The 70% increase in the fatigue limit of induction hardened EA4T steel specimens compared with material subjected to standard heat treatment clearly demonstrates the effectiveness of this technology.A = parameter A 5 = ductility B = parameter C = parameter d = axle body diameter D = wheel seat diameter f = loading frequency f i = frequency HV30 = hardness i = test level M = bending moment q = notch sensitivity parameter R = aspect ratio R e = yield strength R fL = fatigue limit for the smooth specimen R fE = fatigue limit for notched specimen R m = tensile strength R 0 = the lowest level of stress ŝ = standard deviation W o = modulus of resistance of the test specimen section δ = difference in stress between neighbouring test levels Δ = parameter depending on A, B, C ε_ = strain rate I N T R O D U C T I O NDemands for higher reliability and safety of railway vehicles have brought intensive research of degradation processes in railway wheelsets 1-3 and new approaches to wheelset design. 4 Extremely high repeated contact stresses between wheels and rails cause rolling contact fatigue. 1,2 A very serious form of damage to wheel seats is fretting fatigue, caused by small-amplitude oscillatory movement of wheels in press-fitted seat/axle joints. 3

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Section: Introductionmentioning

confidence: 99%

Fatigue limit of induction hardened railway axles

Fajkoš

Zima

Strnadel

2015

Fatigue Fract Eng Mat Struct

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“…It has been sought to explain the geometry influence by the so-called constraint effect, i.e. by different stress states near the crack tip in specimens of different geometry [9,[20][21][22][23]. The authors of [20,22,23] argue the constraint effects by the T-stress, which shows a large variation in specimens tested in the respective studies.…”

Section: Influence Of Specimen Geometrymentioning

confidence: 98%

“…In addition, there are also some differences between laboratory specimens of different geometry [20]. It has been sought to explain the geometry influence by the so-called constraint effect, i.e.…”

Section: Influence Of Specimen Geometrymentioning

confidence: 99%

Damage tolerance of railway axles – The issue of transferability revisited

Gänser

Maierhofer

Tichy

et al. 2016

International Journal of Fatigue

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“…The related issue of the transferability of fatigue crack growth curves derived by the standard method [11] on small standard specimens to the assessment of full-scale axles is discussed elsewhere, see e.g. [12], and is not addressed in this paper.…”

Section: Fracture Mechanics Assessmentmentioning

confidence: 99%