University of Illinois Urbana-Champaign

Investigations of crack growth in railroad car wheels caused by thermally induced residual stress changes and cyclic mechanical loading

Kipp, Robert Marion

Permalink

https://hdl.handle.net/2142/112164

Description

Title
Investigations of crack growth in railroad car wheels caused by thermally induced residual stress changes and cyclic mechanical loading
Author(s)
Kipp, Robert Marion
Issue Date
1978-08
Keyword(s)
  • Crack Growth
  • Wheels, Railway Car
  • Stress Changes (thermal)
  • Cyclic Mechanical Loading
Abstract
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. Comparisons 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.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 428
  • 1978-6006
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112164
Sponsor(s)/Grant Number(s)
Griffin Wheel Company 78/08
Copyright and License Information
Copyright 1978 Board of Trustees of the University of Illinois

Owning Collections

Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.