An elastoplastic numerical model of rolling contact applied to analyze the fatigue of railroad wheels / Modelo numerico elastoplastico de contato com rolamento aplicado a analise de fadiga de rodas ferroviarias

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

This work proposes a wheel-rail contact model based on finite element method to estimate the fatigue life to shelling, until the beginning of the crack of a railroad wheel class C of a heavyhull Brazilian railroad from Serra dos Carajás. The main contribution of this work is the elastoplastic approach with the inclusion of the residual stress generated by the heat treatment of the wheel manufacture process. Submodeling techniques were used to determinate the residual stresses from manufacture process and the contact stresses. Aiming the comparison, the wheelrail contact stresses was calculated using an analytic model, based on Hertz theory, and a numeric model (FEM) without residual stress from the manufactured process. The fatigue life was calculated using two criterions based on critical planes and hydrostatic stresses. The high cycle fatigue criterion from Dang Van was adapted to be used in contact problems. The other one was the Fatemi-Socie criterion, based on shear strains. The number of cycles until the arising of the fatigue crack was correct using a statistical normal distribution of the lateral position of the contact point. This work shows that the residual stress generated by the manufacture process, which prevents the crack propagation, reduces the fatigue life until the arising of the crack

ASSUNTO(S)

ferrovias rodas de vagões fatigue of metals finite element method metais - fadiga railroads metodo dos elementos finitos railroad wheel contact stress plasticidade mecanica dos solidos wheel-rail contact plasticity

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