Are Multiaxial Fatigue Criteria Appropriate When Steels with Surface Defects are Subjected to Rolling Contact Fatigue

2006 ◽  
Vol 3 (10) ◽  
pp. 100416
Author(s):  
SW Dean ◽  
H Desimone ◽  
A Bernasconi ◽  
S Beretta
Keyword(s):  
Surface Defects ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Multiaxial Fatigue ◽  
Rolling Contact

Numerical Simulation of Material Sub-Surface Defects in Rolling Contact Fatigue

2005 ◽  
Author(s):  
M. Taraf ◽  
M. F. Ghanameh ◽  
M. Mliha Touati ◽  
O. Oussouaddi ◽  
A. Zeghloul
Keyword(s):  
Numerical Simulation ◽  
Life Prediction ◽  
Surface Defects ◽  
Rolling Contact Fatigue ◽  
Fatigue Crack Initiation ◽  
Contact Fatigue ◽  
Multiaxial Fatigue ◽  
Rolling Contact ◽  
Contact Fatigue Life ◽  
Four Levels

To ensure the safety and of reducing the costs of maintenances in railways systems, it is necessary to evaluate the life prediction of fatigue crack initiation in rolling contact fatigue starting from the defects. The influence of defects on the rolling contact fatigue was studied, we simulated two types of geometry of defect (circular and elliptic) and also we studied the influence of defects clusters. The stresses and deformations were analyzed in the vicinity of the defect. Calculations were carried out with four levels of loading with the code of finite elements ABAQUS-standard (version 6.3). The fatigue impact was evaluated by using the multiaxial fatigue parameter to estimate the rolling contact fatigue life.

A Coupled Multibody Finite Element Model for Investigating Effects of Surface Defects on Rolling Contact Fatigue

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
Zamzam Golmohammadi ◽  
Farshid Sadeghi
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Surface Defects ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Internal Stresses ◽  
Fe Model ◽  
Elastic Plastic ◽  
Pile Up

A coupled multibody elastic–plastic finite element (FE) model was developed to investigate the effects of surface defects, such as dents on rolling contact fatigue (RCF). The coupled Voronoi FE model was used to determine the contact pressure acting over the surface defect, internal stresses, damage, etc. In order to determine the shape of a dent and material pile up during the over rolling process, a rigid indenter was pressed against an elastic plastic semi-infinite domain. Continuum damage mechanics (CDM) was used to account for material degradation during RCF. Using CDM, spall initiation and propagation in a line contact was modeled and investigated. A parametric study using the model was performed to examine the effects of dent sharpness, pile up ratio, and applied load on the spall formation and fatigue life. The spall patterns were found to be consistent with experimental observations from the open literature. Moreover, the results demonstrated that the dent shape and sharpness had a significant effect on pressure and thus fatigue life. Higher dent sharpness ratios significantly reduced the fatigue life.

Evaluation of Surface Defects of Wheel and Rail for Korean High-Speed Railway

2010 ◽  
Vol 654-656 ◽  
pp. 2499-2502 ◽  
Author(s):  
Chan Woo Lee ◽  
Seok Jin Kwon
Keyword(s):  
High Speed ◽  
Surface Defects ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Railway Vehicle ◽  
High Speed Railway ◽  
Main Research ◽  
Rail Systems ◽  
Micro Cracks

Wheels of the railway vehicle play the important role for driving train through wheel-rail interaction. Especially wheel profile is one of the most important design factors to rule the running stability and safety of train. Accordingly, the control of rolling contact fatigue-related defects is an ongoing concern for both safety and cost reasons. This process is referred to as ratcheting. Wear of wheel and rail surfaces occur due to a mixture of adhesive, abrasive and corrosive processes. In wheel/rail systems with little wear, such failure is manifested by the appearance of closely spaced micro-cracks. In the present paper, a evaluation of surface defects of wheel and rail for Korean high-speed railway. The main research application is the wheel-rail maintenance of Korea high-speed train.

Influence of Partial Slip Conditions on Rolling Contact Fatigue of 1070 Steel

2008 ◽  
Vol 44-46 ◽  
pp. 911-916
Author(s):  
Li Juan Lu ◽  
Xiao Gui Wang ◽  
Li Jian Zhuang ◽  
Zeng Liang Gao ◽  
Y.Y. Jiang
Keyword(s):  
Rolling Contact Fatigue ◽  
Contact Process ◽  
Contact Fatigue ◽  
Normal Pressure ◽  
Multiaxial Fatigue ◽  
Rolling Contact ◽  
Cyclic Plasticity ◽  
Partial Slip ◽  
Slip Conditions ◽  
Tangential Traction

Partial slip rolling contact was analyzed in this paper by the finite element method with the application of a robust cyclic plasticity model. The repeated rolling contact process was carried out by translating the normal pressure and the tangential traction across the contact surface step by step. The normal pressure and the tangential traction were applied to the nodes through the time-dependant amplitude functions as the concentrated nodal forces. With the detailed stress-strain responses output from the FE analysis, a general multiaxial fatigue criterion was used to predict fatigue initiation life and initiation position. The influences of partial slip conditions on the residual stresses, residual shear strain and the initiation lives are obtained.

scholarly journals Effects of surface defects on rolling contact fatigue of 60/40 brass

Wear ◽  
1999 ◽  
Vol 225-229 ◽  
pp. 983-994 ◽  
Author(s):  
N. Gao ◽  
R.S. Dwyer-Joyce ◽  
J.H. Beynon
Keyword(s):  
Surface Defects ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact

Experimental Study of the Effects of Surface Defects on Rolling Contact Fatigue Behavior

2007 ◽  
Vol 353-358 ◽  
pp. 254-257
Author(s):  
Guan Chen ◽  
Hong Ping Zhao ◽  
Shao Hua Ji ◽  
Xi Qiao Feng ◽  
Hui Ji Shi
Keyword(s):  
Failure Modes ◽  
Surface Defects ◽  
Fatigue Behavior ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Surface Cracks ◽  
Hardness Tester ◽  
Rolling Surface ◽  
Contact Fatigue Resistance

Rolling contact fatigue (RCF) cracks initiated from surface and subsurface defects are typical failure modes of bearing systems. In this paper, the effects of surface defects on RCF behavior of M50NiL and M50 steels were studied experimentally. Artificial dents were introduced on the rolling surface by using Rockwell hardness tester. The influences of dent shape and dent shoulders were examined by thrust-type RCF tests. Surface cracks initiation, propagation and spalling were monitored by scanning electron microscope (SEM) observation. The results showed that artificial dents reduce RCF lives of M50NiL and M50 steels with mineral oil lubrication. The fatigue failure initiates at the surface defect with the effects of dent shape and dent shoulder. M50NiL steel has higher contact fatigue resistance than M50. The features of surface and sub-surface cracks propagation during RCF tests were also observed.

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