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Finite element estimation of the residual stresses in roller-straightened rail

File Language:
English


Details

  • Creators:
    Talamini, Brandon ; Gordon, Jeff ; Perlman, A. Benjamin
  • Corporate Contributors:
    John A. Volpe National Transportation Systems Center (U.S.) ; Tufts University ; United States. Department of Transportation. Federal Railroad Administration
  • Subject/TRT Terms:
  • Publication/ Report Number:
    IMECE2004-61850
  • Resource Type:
    Proceedings
  • Geographical Coverage:
    United States
  • Corporate Publisher:
    American Society of Mechanical Engineers
  • Abstract:
    The purpose of this paper is to develop models to accurately predict ; the residual stresses due to the roller straightening of railroad rails. ; Several aspects of residual stress creation in rail due to roller ; straightening are addressed. The effect of the characteristics of the ; loads applied by the roller-straightener on the stress profile is ; examined. In addition, the analysis attempts to discern the relative ; influence of bending and contact on the residual stresses. The last goal ; is to determine how the heat treatment of rail alters the predicted ; roller-straightening residual stress field. ; The loads for the simulation are estimated from available data. To ; identify the most credible values, a baseline loading case is defined ; and modeled. These straightening loads are parameterized by ; considering alternative loading scenarios. Residual stresses and ; deformations are calculated using these loads. ; To separate the effects of bending and contact on the residual stress ; induced by the roller loads, each credible load case is analyzed with ; two models. One is a 2-dimensional generalized plane strain (GPS) ; model that accounts only for the flexural stresses. The other is a fully ; 3-dimensional analysis that includes roll-on-rail contact to make ; estimates of the true residual stress field. Comparison of the residual ; stress results from both models reveals the relative influence of local ; roll-rail contact and bending on the final profile. ; Comparison of the 2- and 3-dimensional residual stress results reveals ; that the magnitude of the contact loads is a decisive influence on the ; stress field, even in portions of the rail web located far from the ; contact interface. Therefore, it is critical to obtain accurate estimates ; of the straightening loads to make accurate roller straightening ; residual stress estimates. ; Heat treatment of the rail prior to roller straightening primarily affects ; the longitudinal residual stress in the web, causing a positive shift in ; the stress values.
  • Format:
    PDF
  • Download URL:
    https://rosap.ntl.bts.gov/view/dot/8992/dot_8992_DS1.pdf
  • File Type:
    Filetype[PDF - 370.03 KB]
  • Collection(s):
    Volpe Center ; Federal Railroad Administration
  • Main Document Checksum:
    urn:sha-512:697cfb14e02d2bfabdf99060cf9a6ae91af56086af6f9fcf488870ec255202dc90147268a2453d109aaff6ab10569ad29df73489811617c96583c907e44a3c4f
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