scholarly journals Fracture Mechanics Based Models of Structural and Contact Fatigue

10.5772/48511 ◽  
2012 ◽  
Author(s):  
Ilya I.
Keyword(s):  
Fracture Mechanics ◽  
Contact Fatigue

A Possible Mechanism for Rail Dark Spot Defects

1998 ◽  
Vol 120 (2) ◽  
pp. 304-309 ◽  
Author(s):  
M. Kaneta ◽  
K. Matsuda ◽  
K. Murakami ◽  
H. Nishikawa
Keyword(s):  
Fracture Mechanics ◽  
Fatigue Failure ◽  
High Speed ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Traction Force ◽  
Rolling Contact ◽  
Dark Spot ◽  
A Posteriori ◽  
Direction Opposite

Rail dark spot defect, also termed squat failure or shelling, which is a kind of rolling contact fatigue failure and occurs frequently on running surfaces of railway rails carrying high speed traffic, is one of the most dangerous rail failures. The dark spot crack is characterized by a principal crack propagating in the direction of traffic and a second crack growing in the direction opposite to traffic. By using a newly developed two-disk machine, the authors have succeeded in reproducing very similar dark spot cracks to those which appear in actual rails. It is found that the dark spot defects are caused by frequent repetitions of dry and wet runnings, and that the traction force plays an important role for the occurrence of the cracks. The principal crack may occur from a tiny pit formed a posteriori on the contacting surface and after that, the second crack is formed by cracks branched from the extended principal crack. It has also been proved experimentally that water is capable of entering the tip of the crack. Furthermore, a possible mechanism for the dark spot cracking has been proposed on the basis of the fracture mechanics approach.

Contact Fatigue Tests and Life Simulations Using Computational Fracture Mechanics

2005 ◽  
Author(s):  
Hong Lin ◽  
Robert R. Binoniemi ◽  
Gregory A. Fett ◽  
Douglas C. Burke ◽  
Thomas Woodard
Keyword(s):  
Fracture Mechanics ◽  
Contact Fatigue ◽  
Fatigue Tests ◽  
Computational Fracture Mechanics

Fracture mechanics approach to initiation of subsurface cracks of carburized SCM415 under rolling contact fatigue

2002 ◽  
Vol 2002.77 (0) ◽  
pp. _6-3_-_6-4_
Author(s):  
Hiroyuki ASOU ◽  
Katsuyuki KIDA ◽  
Yasuhito HUKUOKA ◽  
Masamichi SHIBATA ◽  
Keiji OGURA
Keyword(s):  
Fracture Mechanics ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Subsurface Cracks
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