Predicting crack initiation due to ratchetting in rail heads using critical element analysis

Wickramasinghe, Isuru Udara, Hargreaves, Douglas, & De Pellegrin, Dennis (2013) Predicting crack initiation due to ratchetting in rail heads using critical element analysis. International Journal of Materials Science and Engineering, 77, pp. 850-856.

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Abstract

This paper presents a strategy to predict the lifetime of rails subjected to large rolling contact loads that induce ratchetting strains in the rail head. A critical element concept is used to calculate the number of loading cycles needed for crack initiation to occur in the rail head surface. In this technique the finite element method (FEM) is used to determine the maximum equivalent ratchetting strain per load cycle, which is calculated by combining longitudinal and shear stains in the critical element. This technique builds on a previously developed critical plane concept that has been used to calculate the number of cycles to crack initiation in rolling contact fatigue under ratchetting failure conditions. The critical element concept simplifies the analytical difficulties of critical plane analysis. Finite element analysis (FEA) is used to identify the critical element in the mesh, and then the strain values of the critical element are used to calculate the ratchetting rate analytically. Finally, a ratchetting criterion is used to calculate the number of cycles to crack initiation from the ratchetting rate calculated.

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ID Code: 65236
Item Type: Journal Article
Refereed: Yes
Additional URLs:
Keywords: Critical element analysis, Finite element modeling (FEM), Wheel/rail contact
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2013 World Academy of Science, Engineering and Technology
Deposited On: 09 Dec 2013 22:53
Last Modified: 11 Dec 2013 07:05

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