INVESTIGATIONS OF CRACK GROWTH IN RAILROAD CAR WHEELS CAUSED BY THERMALLY INDUCED RESIDUAL STRESS CHANGES AND CYCLIC MECHANICAL LOADING

The elastic-plastic deformation of railroad car wheels as a result of heat input to the wheels during tread braking is analyzed using the deformation theory of plasticity incorporating material stress-strain behavior found as a function of temperature at a prechosen loading rate. The magnitudes of residual circumferential stress changes after cooling are studied to determine the likelihood of crack growth of certain size flaws in the wheel rim. Comparison with experimental crack growth data and experimentally measured permanent deformations of wheels after testing are used to check the accuracy of the computer predictions. Cyclic stresses from the supporting loads of the rail on the wheel are found by use of a finite element program which modeled the loads with a Fourier series expansion and are verified by comparison with experimental data. The magnitudes of these ranges of stress are considered along with the residual stress changes from thermal overloads to analyze the possibility of growth of these rim cracks in service. Finally, comparisons with service failures are made in order to define the applicability of the method of analysis developed here.

  • Corporate Authors:

    University of Illinois, Urbana-Champaign

    Department of Theoretical and Applied Mechanics
    Urbana, IL  USA  61801
  • Authors:
    • Kipp, R M
  • Publication Date: 1978-8

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Filing Info

  • Accession Number: 00193767
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: May 26 1979 12:00AM