Effects of full-stops on shoe-braked railway wheel wear damage

Faccoli, Michela; Provezza, Luca; Petrogalli, Candida; Ghidini, A.; Mazzù, Angelo

doi:10.1016/j.wear.2019.03.006

Cited by 15 publications

(8 citation statements)

References 30 publications

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“…The articles [26,27] present an analysis of complex phenomena of damage occurring at the contact between a cast-iron brake block and a railway wheel under the influence of thermomechanical loads. In the first stage, the FEM analysis of the braking-to-stop was performed in order to estimate the temperature distribution in the wheel rim.…”

Section: Introductionmentioning

confidence: 99%

Methodology of estimation of temperature mode in the 2xBgu type railway braking system

Yevtushenko

Kuciej

Grześ

et al. 2022

Preprint

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The article describes two numerical FEM models of frictional heating to estimate the temperature distribution in the 2xBgu friction brake of a rail vehicle during repetitive braking. The numerical tests were compared with the temperature measurements carried out on a full-scale inertia dynamometer for two different friction materials of brake blocks working in the 2xBgu system. The paper demonstrates, by comparison with experimental data, that the proposed numerical models can be used as a tool supporting engineering works to determine the temperature of friction elements of a railway block brake, also for long-lasting braking processes.

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Section: Introductionmentioning

confidence: 99%

Methodology of estimation of temperature mode in the 2xBgu type railway braking system

Yevtushenko

Kuciej

Grześ

et al. 2022

Preprint

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“…Faccoli et al studied temperature of the wheel of the block brake by using a simplified axisymmetric model with the heat flux uniformly distributed in the circumferential direction 23 . The braking force was assumed to be constant and therefore also the deceleration was constant.…”

Section: Introductionmentioning

confidence: 99%

Methodology of estimation of temperature mode in the 2xBgu type railway braking system

Yevtushenko

Kuciej

Grześ

et al. 2022

Sci Rep

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The article presents finite element models of the 2xBgu type tread brake for the simulation of extended repeated frictional heating carried out on a full-scale inertia dynamometer. The numerical calculations were conducted for the brake blocks made of two organic composite materials newly developed specifically for this study. The transient temperature changes obtained from the 2D axisymmetric and 3D finite element analyses and experimental data agreed well during continuous process of about 1200 s. Simulation of such a long period of braking sequence required introducing simplifications in the boundary conditions in the contact area, convection cooling, arrangement of the model (2D axisymmetric, 3D). The focus was laid on representation of variation of the coefficient of friction and the temperature dependence of the properties of the friction materials during braking. The carried out research indicates limitations in the finite element analysis and directions of necessary improvements in modelling as well as measurements with the use of embedded thermocouples.

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“…A well‐established approach for a general assessment of wear in railway wheel is based on the wear maps, 4 which allow determining the grade of wear (classified as “mild,” “severe,” and “catastrophic”) depending on the contact load and wheel‐rail sliding speed. Some works highlighted the effect of environmental factors (such as sand 5 or snow and humidity 6,7 ), as well as of operational factors (such as shoe braking 3,8,9 ) on the wear rate.…”

Section: Introductionmentioning

confidence: 99%

Application of the Failure Assessment Diagram approach for contact fatigue damage evaluation in railway wheel steels

Donzella

Danesi

Mazzù

et al. 2021

Fatigue Fract Eng Mat Struct

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A Failure Assessment Diagram (FAD), developed for rolling contact, was specifically formulated for railway wheel steels. The FAD allows combining a multiaxial fatigue criterion with the linear elastic fracture mechanics concept; in particular, it was used to assess the fatigue failure in wet contact, related to the pressurization of the fluid entrapped in surface cracks. The approach was applied to the results of previous bi‐disc tests carried out on three railway wheel steels, subjected first to a dry rolling‐sliding contact step, then to a wet contact step. The crack size distribution after the dry contact step was evaluated by a statistical approach; subsequently, the stress intensity factor during the wet contact step was estimated by finite elements. The results of the FAD agreed with the damage observed on the cross section of the specimens at the end of the tests. Furthermore, the FAD was used to determine the maximum allowable crack to prevent rolling contact fatigue, this way showing its potential as a damage tolerant approach.

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Effects of full-stops on shoe-braked railway wheel wear damage

Cited by 15 publications

References 30 publications

Methodology of estimation of temperature mode in the 2xBgu type railway braking system

Methodology of estimation of temperature mode in the 2xBgu type railway braking system

Methodology of estimation of temperature mode in the 2xBgu type railway braking system

Application of the Failure Assessment Diagram approach for contact fatigue damage evaluation in railway wheel steels

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