A comprehensive approach for modeling fatigue and fracture of rails
A comprehensive approach is developed for studying the fatigue phenomena (crack initiation and propagation) induced by repeated rolling or rolling–sliding contacts between wheel and rail. Cracks initiate and propagate in the rail head in a complex varying multiaxial stress regime due to Hertzian or...
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Published in | Engineering fracture mechanics Vol. 76; no. 17; pp. 2626 - 2636 |
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Main Authors | , , , |
Format | Journal Article Conference Proceeding |
Language | English |
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01.11.2009
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Abstract | A comprehensive approach is developed for studying the fatigue phenomena (crack initiation and propagation) induced by repeated rolling or rolling–sliding contacts between wheel and rail. Cracks initiate and propagate in the rail head in a complex varying multiaxial stress regime due to Hertzian or non-Hertzian contacts generating 3D residual stress pattern. This paper presents the main steps of such an approach devoted to the modeling of defects induced in the rails by the traffic. Special attention is paid to some of the principal difficulties met as well as to the proposed solutions. Examples of applications for the prediction of initiation as well as propagation of some defects are presented. It is shown that numerical simulations predict very well the locus of crack initiation as well as its propagation in the rail. Our approach presents at least three main originalities: first, it is a global approach starting from the evaluation of the initial state of the rail to the simulation of the crack propagation under complex loading including multiaxial residual stresses. Second, special and original numerical methods for the evaluation of the initial states, the overloads and the elastoplastic state under service loading have been developed. Third, a new concept based on a “structural Paris law” has been developed and used in the crack propagation simulations. |
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AbstractList | A comprehensive approach is developed for studying the fatigue phenomena (crack initiation and propagation) induced by repeated rolling or rolling–sliding contacts between wheel and rail. Cracks initiate and propagate in the rail head in a complex varying multiaxial stress regime due to Hertzian or non-Hertzian contacts generating 3D residual stress pattern. This paper presents the main steps of such an approach devoted to the modeling of defects induced in the rails by the traffic. Special attention is paid to some of the principal difficulties met as well as to the proposed solutions. Examples of applications for the prediction of initiation as well as propagation of some defects are presented. It is shown that numerical simulations predict very well the locus of crack initiation as well as its propagation in the rail. Our approach presents at least three main originalities: first, it is a global approach starting from the evaluation of the initial state of the rail to the simulation of the crack propagation under complex loading including multiaxial residual stresses. Second, special and original numerical methods for the evaluation of the initial states, the overloads and the elastoplastic state under service loading have been developed. Third, a new concept based on a “structural Paris law” has been developed and used in the crack propagation simulations. |
Author | Moumni, Z. Dang Van, K. Roger, F. Maitournam, M.H. |
Author_xml | – sequence: 1 givenname: K. surname: Dang Van fullname: Dang Van, K. email: dangvan@lms.polytechnique.fr organization: Laboratoire de Mécanique des Solides, UMR 7649 CNRS, Ecole polytechnique, F-91128 Palaiseau, France – sequence: 2 givenname: M.H. surname: Maitournam fullname: Maitournam, M.H. organization: Laboratoire de Mécanique des Solides, UMR 7649 CNRS, Ecole polytechnique, F-91128 Palaiseau, France – sequence: 3 givenname: Z. surname: Moumni fullname: Moumni, Z. organization: Unité de Mécanique, Groupe Matériaux et Structures, Ecole Nationale Supérieure de Techniques Avancées, 91761 Palaiseau Cedex, France – sequence: 4 givenname: F. surname: Roger fullname: Roger, F. organization: Unité de Mécanique, Groupe Matériaux et Structures, Ecole Nationale Supérieure de Techniques Avancées, 91761 Palaiseau Cedex, France |
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Cites_doi | 10.1111/j.1460-2695.2007.01160.x 10.1016/j.wear.2004.03.039 10.1016/S0043-1648(02)00104-7 10.1016/0043-1648(95)06864-3 10.3139/120.100875 10.1002/nme.1620110505 10.1046/j.1460-2695.2003.00698.x 10.1080/00423110412331327193 10.1016/j.engfracmech.2003.11.010 10.1007/978-3-7091-2474-1_2 10.1016/S0927-0256(98)00055-X |
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Keywords | Fatigue Structural Paris law Stationary method Crack propagation Rolling sliding contact Mechanical contact Multiaxial stress Fatigue fracture Modeling Fatigue crack Combined load Hertzian contact Rail Contact stress Rail traffic Residual stress Crack initiation |
Language | English |
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repeated rolling and sliding contact publication-title: J Mech Phys Solids contributor: fullname: Dang Van – volume: 13 start-page: 148 issue: 1–3 year: 1998 ident: 10.1016/j.engfracmech.2008.12.020_bib14 article-title: Internal stresses in dislocation subgrain structures publication-title: Comput Mater Sci doi: 10.1016/S0927-0256(98)00055-X contributor: fullname: Sedlácek |
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Snippet | A comprehensive approach is developed for studying the fatigue phenomena (crack initiation and propagation) induced by repeated rolling or rolling–sliding... A comprehensive approach is developed for studying the fatigue phenomena (crack initiation and propagation) induced by repeated rolling or rolling-sliding... |
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SubjectTerms | Computer simulation Crack initiation Crack propagation Engineering Sciences Exact sciences and technology Fatigue Fatigue failure Fracture mechanics Fracture mechanics (crack, fatigue, damage...) Fundamental areas of phenomenology (including applications) Inelasticity (thermoplasticity, viscoplasticity...) Materials and structures in mechanics Mathematical models Mechanical contact (friction...) Mechanics Physics Rails Residual stress Solid mechanics Stationary method Structural and continuum mechanics Structural mechanics Structural Paris law |
Title | A comprehensive approach for modeling fatigue and fracture of rails |
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