Multi-parameter Fatigue Equivalence Loadings for Specification Applications

Roux, Clément; Lorang, Xavier; Maïtournam, Habibou; Nguyen-Tajan, Mac-Lan; Quesson, B.A.J.

doi:10.1016/j.proeng.2013.12.093

Cited by 6 publications

(2 citation statements)

References 10 publications

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“…For example, in the project DEFFI led in 2010 by the Cetim, a French research and technical centre for the mechanical industries, with the participation of several companies such as Snecma/Cnes, Mecalac, etc., many applications were studied: elements of the Vulcain engine for Ariane 5 launcher, cable of a ski lift, boom and arm of earth moving machines, bogie of a TGV [10]. Similar work was also led by SNCF on wheels load analysis [17].…”

Section: Methods To Generate the Distribution Of In-service Load Severmentioning

confidence: 99%

EURAXLES - A global approach for design, production and maintenance of railway axles: WP1 - Advances in fatigue load analysis and reliability assessment of railway axles

Nguyen-Tajan

Lorang

2017

Mat.-wiss. u. Werkstofftech.

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The work presented in this paper was led within the collaborative project “Euraxles” of the FP7 program of the European Commission. It aimed at developing processes and methods that contribute to the minimization of the risk of fatigue failure of railway axles in service. This paper focuses on the development of a method to assess the reliability of axles according to fatigue damage. The proposed approach is mainly based on the stress strength interference analysis (SSIA) and the fatigue‐equivalent‐load (FEL) methods. It aims at calculating the axles’ probability of fatigue failure, by characterizing the variability of real in‐service loads and the scatter of the axles fatigue strength, and at evaluating more accurately the actual design margins. First of all, the main lines of the stress strength interference analysis method are recalled. This method aims at evaluating the in‐service reliability of components for their design or their homologation. It is used in many industries for various applications (mechanical components or systems, electronic elements, etc.). In the second part, the fatigue load analysis method that is proposed for railway axles is described. It starts with a post‐processing of an axle load measurement: from a time signal of forces applied to both wheels fitted on the axle, fatigue cycles of bending moment applied to the axle are identified and transformed into a cyclic equivalent load, the Meq, which is a measurement of the severity of the initial variable load. Then, virtual but realistic load spectra are generated, thanks to a classification operation followed by a random draw of elementary load data that considers the operation and maintenance conditions of the axle. All the spectra are then analysed thanks to the fatigue‐equivalent‐load method in order to build the distribution of in‐service load severities that gives a picture of the stress to which the axles are submitted. In the third and last part of the paper, the methods are applied to real data of “Société nationale des chemins de fer français” (SNCF), the French national railway operator. Sensitivity analyses are performed in order to quantify the effect on the Meq of variations of parameters and to verify the convergence and robustness of the process. Finally, results obtained for a passenger coach are given. The comparison between the distribution of load severities and the normative load, defined as according to european standards EN13103, shows that, for the studied axle, the normative load is very conservative. Using the axles fatigue limits identified on full‐scale tests, a stress strength interference analysis is performed to calculate the probability of failure of the axle.

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Section: Methods To Generate the Distribution Of In-service Load Severmentioning

confidence: 99%

EURAXLES - A global approach for design, production and maintenance of railway axles: WP1 - Advances in fatigue load analysis and reliability assessment of railway axles

Nguyen-Tajan

Lorang

2017

Mat.-wiss. u. Werkstofftech.

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“…Recently, Roux [15] proposed an alternative to this hypothesis. The equivalence is seeked for every points of a finite number of similar structures already in use, here, train wheels.…”

Section: Elastic Quasi-static Nd Loadmentioning

confidence: 99%

Fatigue equivalent load approach for fatigue design

Raoult

Delattre

2019

MATEC Web Conf.

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Industrial structures undergo complex loading often unsuitable for the design and validation phases of their development. Engineers seek simplified signals to replace them, yet equivalent in terms of fatigue. A general framework for the construction of fatigue equivalent loads is presented, intended to take into account some uncertainty on the structure to which it will apply. The guiding idea is to describe this uncertainty thanks to parameters of a model of the structure, and then to assure the equivalence of damage or failure behavior over the whole range of expected parameters. The approach is applied in the case of structures undergoing multiple inputs of concentrated force.

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Non-parametric optimization of railway wheel web shape based on fatigue design criteria

Yamamoto

2020

International Journal of Fatigue

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Multi-parameter Fatigue Equivalence Loadings for Specification Applications

Cited by 6 publications

References 10 publications

EURAXLES - A global approach for design, production and maintenance of railway axles: WP1 - Advances in fatigue load analysis and reliability assessment of railway axles

EURAXLES - A global approach for design, production and maintenance of railway axles: WP1 - Advances in fatigue load analysis and reliability assessment of railway axles

Fatigue equivalent load approach for fatigue design

Non-parametric optimization of railway wheel web shape based on fatigue design criteria

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