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Proposal of a new method for strength evaluating of construction of railway vehicles

Optimization of hood of diesel electric locomotive

  • Technical Paper
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Journal of the Brazilian Society of Mechanical Sciences and Engineering Aims and scope Submit manuscript

Abstract

This article presents two methods for evaluating the strength of the hood of railway locomotives. The hood is subject to the European standards for railway applications EN 12663-1 Railway applications Structural requirements of railway vehicle bodies Part 1: Locomotives and passenger rolling stock. Czech Standards Institute (2010). The first method is based on the European standard for railway applications EN 12663-1 Railway applications Structural requirements of railway vehicle bodies Part 1: Locomotives and passenger rolling stock. Czech Standards Institute (2010). This method is based on the principle of evaluation of the pseudo-elastic stress. The second method uses the results of geometrically and materially nonlinear numerical analyses. The second method is based on the knowledge of modern science and technology. Structural strength is then evaluated from the real limit state. Using both methods for strength evaluating is shown in this paper (strength evaluation of hood of diesel electric locomotive). The original construction of the hood is analyzed in the first part of this paper. Structural changes are proposed in the next part of this article. The carrying capacity of the new construction of the hood is verified by a numerical analysis. The results of the new construction are compared with the original construction of the hood

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Abbreviations

a :

Acceleration \((\mathrm{ms}^{-2})\)

\(a_{ALL}\) :

Allowable acceleration \((\mathrm{ms}^{-2})\)

\(a_L\) :

Limit acceleration \((\mathrm{ms}^{-2})\)

\(a_x\) :

Acceleration in the direction of the x axis \((\mathrm{ms}^{-2})\)

E :

Young’s modulus in tension \((\mathrm{Nmm}^{-2})\)

\(E_T\) :

Tangent modulus \((\mathrm{Nmm}^{-2})\)

\(f_y\) :

Yield strength \((\mathrm{Nmm}^{-2})\)

\(f_u\) :

Ultimate strength \((\mathrm{Nmm}^{-2})\)

g :

Acceleration of gravity \((\mathrm{ms}^{-2})\)

\(S_1\) :

Safety factor given the yield strength (l)

\(S_2\) :

Safety factor given the ultimate strength (l)

\(S_3\) :

Safety factor for loss of stability (l)

\(S_f\) :

Fictitious safety factor (l)

T :

Calculation temperature \((^\circ \mathrm{C})\)

\(W_{pl}\) :

Plastic cross section modulus in bending \((\mathrm{mm}^3)\)

\(W_{el}\) :

Elastic cross section modulus in bending \((\mathrm{mm}^3)\)

\(\mu\) :

Poisson’s number \((-)\)

\(\sigma _{ALL}\) :

Allowable elastic stress \((\mathrm{Nmm}^{-2})\)

\(\sigma _{int}\) :

Reduced stress by hypothesis Tresca \((\mathrm{Nmm}^{-2})\)

References

  1. EN 12663-1 (2010) Railway applications Structural requirements of railway vehicle bodies Part 1: Locomotives and passenger rolling stock. Czech Standards Institute (in Czech)

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Author information

Authors and Affiliations

  1. Department of Mechanics, Materials and machine Parts, University of Pardubice, 53210, Pardubice, Czech Republic

    Petr Tomek & Doubravka Středová

Authors
  1. Petr Tomek
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  2. Doubravka Středová
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Corresponding author

Correspondence to Petr Tomek.

Additional information

Technical Editor: Fernando Antonio Forcellini.

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Tomek, P., Středová, D. Proposal of a new method for strength evaluating of construction of railway vehicles. J Braz. Soc. Mech. Sci. Eng. 39, 235–244 (2017). https://doi.org/10.1007/s40430-016-0550-6

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  • DOI: https://doi.org/10.1007/s40430-016-0550-6

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