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Influence of the operational conditions on static and dynamic stiffness of rail pads.

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Title: Influence of the operational conditions on static and dynamic stiffness of rail pads.
Authors: Sainz-Aja, Jose A.1 (AUTHOR) sainzajaj@unican.es, Carrascal, Isidro A.1 (AUTHOR), Ferreño, Diego1 (AUTHOR), Pombo, Joao2,3 (AUTHOR), Casado, Jose A.1 (AUTHOR), Diego, Soraya1 (AUTHOR)
Source: Mechanics of Materials. Sep2020, Vol. 148, pN.PAG-N.PAG. 1p.
Subjects: Dynamic stiffness, Ballast (Railroads), Railroads, Impact loads, Rolling contact fatigue, Rolling stock, Network performance
Abstract: • Full-scale characterization of fastening systems under in-service conditions. • Temperature increments notably reduce rail pad stiffness. • Toe load increments significantly increase rail pad stiffness. • Axle load increments increase rail pad stiffness. • Frequency increments slightly increase rail pad stiffness. The track has a crucial role in the performance of the rail network as it provides support and guidance to the rolling stock. During train operation, the vehicle-track interaction generates high impact loads and fatigue, which lead to degradation of vehicle components and rail infrastructure. These loads tend to increase the maintenance needs and, consequently, the life-cycle-costs of the rail assets. In order to minimize these consequences, rail pads are generally used between the rails and the sleepers in order to provide flexibility to the track and to damp the transmission of noise and vibrations. In ballasted tracks, this flexibility is a combination of the mechanical properties of the ballast and the rail pads. However, in slab tracks, the flexibility of the infrastructure is almost exclusively dependant on the rail pads. These materials exhibit non-linear, dissipative characteristics that are affected by the service conditions such as temperature, frequency, toe load and axle load. This work aims to investigate experimentally different pad materials widely used in the rail industry in order to characterize the influence of these factors on the mechanical characteristics of the rail supporting elements. The detailed characterization of the rail pads enables not only better understanding of their performance in realistic service conditions, but also provides good perspectives for use of these well quantified mechanical properties in studying the vehicle-track dynamic behaviour in different scenarios and predicting the long-term performance of the infrastructure components. [ABSTRACT FROM AUTHOR]
Copyright of Mechanics of Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 144872527
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Influence of the operational conditions on static and dynamic stiffness of rail pads.
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  Data: <searchLink fieldCode="AR" term="%22Sainz-Aja%2C+Jose+A%2E%22">Sainz-Aja, Jose A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> sainzajaj@unican.es</i><br /><searchLink fieldCode="AR" term="%22Carrascal%2C+Isidro+A%2E%22">Carrascal, Isidro A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ferreño%2C+Diego%22">Ferreño, Diego</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pombo%2C+Joao%22">Pombo, Joao</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Casado%2C+Jose+A%2E%22">Casado, Jose A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Diego%2C+Soraya%22">Diego, Soraya</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="DE" term="%22Dynamic+stiffness%22">Dynamic stiffness</searchLink><br /><searchLink fieldCode="DE" term="%22Ballast+%28Railroads%29%22">Ballast (Railroads)</searchLink><br /><searchLink fieldCode="DE" term="%22Railroads%22">Railroads</searchLink><br /><searchLink fieldCode="DE" term="%22Impact+loads%22">Impact loads</searchLink><br /><searchLink fieldCode="DE" term="%22Rolling+contact+fatigue%22">Rolling contact fatigue</searchLink><br /><searchLink fieldCode="DE" term="%22Rolling+stock%22">Rolling stock</searchLink><br /><searchLink fieldCode="DE" term="%22Network+performance%22">Network performance</searchLink>
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  Data: • Full-scale characterization of fastening systems under in-service conditions. • Temperature increments notably reduce rail pad stiffness. • Toe load increments significantly increase rail pad stiffness. • Axle load increments increase rail pad stiffness. • Frequency increments slightly increase rail pad stiffness. The track has a crucial role in the performance of the rail network as it provides support and guidance to the rolling stock. During train operation, the vehicle-track interaction generates high impact loads and fatigue, which lead to degradation of vehicle components and rail infrastructure. These loads tend to increase the maintenance needs and, consequently, the life-cycle-costs of the rail assets. In order to minimize these consequences, rail pads are generally used between the rails and the sleepers in order to provide flexibility to the track and to damp the transmission of noise and vibrations. In ballasted tracks, this flexibility is a combination of the mechanical properties of the ballast and the rail pads. However, in slab tracks, the flexibility of the infrastructure is almost exclusively dependant on the rail pads. These materials exhibit non-linear, dissipative characteristics that are affected by the service conditions such as temperature, frequency, toe load and axle load. This work aims to investigate experimentally different pad materials widely used in the rail industry in order to characterize the influence of these factors on the mechanical characteristics of the rail supporting elements. The detailed characterization of the rail pads enables not only better understanding of their performance in realistic service conditions, but also provides good perspectives for use of these well quantified mechanical properties in studying the vehicle-track dynamic behaviour in different scenarios and predicting the long-term performance of the infrastructure components. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Mechanics of Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.mechmat.2020.103505
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Dynamic stiffness
        Type: general
      – SubjectFull: Ballast (Railroads)
        Type: general
      – SubjectFull: Railroads
        Type: general
      – SubjectFull: Impact loads
        Type: general
      – SubjectFull: Rolling contact fatigue
        Type: general
      – SubjectFull: Rolling stock
        Type: general
      – SubjectFull: Network performance
        Type: general
    Titles:
      – TitleFull: Influence of the operational conditions on static and dynamic stiffness of rail pads.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Sainz-Aja, Jose A.
      – PersonEntity:
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            NameFull: Carrascal, Isidro A.
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            NameFull: Ferreño, Diego
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            NameFull: Pombo, Joao
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            NameFull: Casado, Jose A.
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            NameFull: Diego, Soraya
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          Dates:
            – D: 01
              M: 09
              Text: Sep2020
              Type: published
              Y: 2020
          Identifiers:
            – Type: issn-print
              Value: 01676636
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            – Type: volume
              Value: 148
          Titles:
            – TitleFull: Mechanics of Materials
              Type: main
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