A single parameter to evaluate stress state in rail head for rolling contact fatigue analysis

2014 ◽  
Vol 37 (8) ◽  
pp. 909-919 ◽  
Author(s):  
C. L. Pun ◽  
Q. Kan ◽  
P. J. Mutton ◽  
G. Kang ◽  
W. Yan
Keyword(s):  
Stress State ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Fatigue Analysis ◽  
Rolling Contact ◽  
Single Parameter ◽  
Rail Head

On the Evaluation of the Stress State in Rail Head for Assessing Fatigue Resistance

2014 ◽  
Vol 891-892 ◽  
pp. 1157-1162 ◽  
Author(s):  
Chung Lun Pun ◽  
Qian Hua Kan ◽  
Peter J. Mutton ◽  
Guo Zheng Kang ◽  
Wen Yi Yan
Keyword(s):  
Stress State ◽  
Fatigue Resistance ◽  
Fatigue Analysis ◽  
Multiaxial Fatigue ◽  
Rolling Contact ◽  
Single Parameter ◽  
Von Mises Stress ◽  
Stress Range ◽  
Rail Head ◽  
Von Mises

To search for a single parameter to evaluate the stress state in rail head during wheel/rail rolling contact situations, the stress-based and the strain based phenomenological approaches for multiaxial fatigue analysis can be considered as the candidates. Following the stress-based approach, the maximum von Mises stress range can be applied as a single parameter to evaluate the stress state in the rail head. However, the von Mises stress range only relies on the stress field in the rail head for the fatigue analysis, which is not sufficient for assessing the fatigue resistance of the rail steel. The Smith-Watson-Topper (SWT) method, the strain-based phenomenological approach for multiaxial fatigue analysis which considers stress, elastic strain and plastic strain components, is then adopted to study rolling contact fatigue in the rail head. Combining with the three-dimensional finite element modelling of a steady-state wheel/rail rolling contact, the numerical procedure to calculate the SWT parameter in the rail head is presented. The capability of the SWT method to predict the initiation of fatigue cracks in the rail head is confirmed in a case study. Consequently, the maximum SWT parameter is proposed as a single parameter to effectively evaluate the stress state in the rail head.

scholarly journals Development of a Granular Cohesive Model for Rolling Contact Fatigue Analysis: Crystal Anisotropy Modeling

2016 ◽  
Vol 59 (3) ◽  
pp. 469-479 ◽  
Author(s):  
J.-P. Noyel ◽  
F. Ville ◽  
P. Jacquet ◽  
A. Gravouil ◽  
C. Changenet
Keyword(s):  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Fatigue Analysis ◽  
Rolling Contact ◽  
Cohesive Model ◽  
Crystal Anisotropy

scholarly journals Rail Integrity Experience on the Washington Metro System

2016 ◽  
Author(s):  
Benjamin Frison ◽  
David Y. Jeong
Keyword(s):  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Surface Damage ◽  
Rolling Contact ◽  
Recent Experience ◽  
Rail Head ◽  
Passenger Rail ◽  
Maintenance Factors ◽  
Rail System ◽  
Rail Service

The Washington Metropolitan Area Transit Authority (WMATA) provides passenger rail service to the nation’s capital. Although the rail system carries only passenger trains, the rail integrity issues that WMATA must manage are similar to those that freight railroads also face. These issues include occurrences of broken rail from internal rail head defects, detection of such defects, and repair of the rail to restore service. Another example is the development of damage on the running surface of the rail, called rolling contact fatigue (RCF). Such surface damage is known to adversely affect the detection of internal rail head defects beneath RCF conditions. While WMATA’s rail integrity issues may be similar to those that freight railroads also encounter, the management of such issues are different, which are also discussed in this paper. This paper describes the recent experience of broken rails on the WMATA rail system. In addition, results from engineering fracture mechanics analyses are presented to help understand how operational, environmental, design, and maintenance factors influence rail failure.

Sign in / Sign up

Export Citation Format

Share Document