Evaluation of Rolling Contact Fatigue Using X-Ray Diffraction Ring

2016 ◽  
pp. MPC20150027 ◽  
Author(s):  
Takumi Fujita ◽  
Naoya Kamura ◽  
Yoichi Maruyama ◽  
Toshihiko Sasaki
Keyword(s):  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
X Ray Diffraction ◽  
Diffraction Ring ◽  
X Ray

Evaluation of Rolling Contact Fatigue by Using an X-Ray Diffraction Ring Analyzer

2016 ◽  
Vol 879 ◽  
pp. 891-896 ◽  
Author(s):  
Naoya Kamura ◽  
Takumi Fujita ◽  
Toshihiko Sasaki
Keyword(s):  
Axial Stress ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Point Of View ◽  
Rolling Contact ◽  
Asperity Contact ◽  
X Ray Diffraction ◽  
Principal Stresses ◽  
Diffraction Ring ◽  
X Ray

In this report, rolling contact fatigue (RCF) progression in two-cylinder type RCF testing is evaluated by using an X-ray diffraction ring analyzer, which can rapidly obtain tri-axial stress and the orientation of crystallite. The large compressive and three principal stresses on the RCF surface are observed under boundary lubrication. It is considered that the crack occurrence and its propagation by asperity contact of surface roughness are caused by residual principal shear stress and the repeated contact stress. In addition, the behavior of RCF progression from the point of view of the X-ray measurements is similar for the driving and driven specimen until the generation of peeling begins. This supports the conclusion of Kaneta et al. that the RCF progression for the driven cylinder is the same as that for driving cylinder until peeling occurs.

Service Loading Analysis of Wind Turbine Gearbox Rolling Bearings Based on X-Ray Diffraction Residual Stress Measurements

2013 ◽  
Vol 768-769 ◽  
pp. 723-732 ◽  
Author(s):  
Jürgen Gegner ◽  
Wolfgang Nierlich
Keyword(s):  
Residual Stress ◽  
Wind Turbine ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
X Ray Diffraction ◽  
Rolling Bearings ◽  
Wind Turbine Gearbox ◽  
X Ray ◽  
Stress Measurements

Rolling bearings in wind turbine gearboxes occasionally fail prematurely by so-called white etching cracks. The appearance of the damage indicates brittle spontaneous tensile stress induced surface cracking followed by corrosion fatigue driven crack growth. An X-ray diffraction based residual stress analysis reveals vibrations in service as the root cause. The occurrence of high local friction coefficients in the rolling contact is described by a tribological model. Depth profiles of the equivalent shear and normal stresses are compared with residual stress patterns and a relevant fracture strength, respectively. White etching crack failures are reproduced on a rolling contact fatigue test rig under increased mixed friction. Causative vibration loading is evident from residual stress measurements. Cold working compressive residual stresses are an effective countermeasure.

Evaluation of Railway Rails Suffered from Rolling Contact Fatigue Using X-Ray Generalized cosα Method

2018 ◽  
Vol 941 ◽  
pp. 2378-2383
Author(s):  
Toshihiko Sasaki
Keyword(s):  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Full Width ◽  
Half Maximum ◽  
Diffraction Ring ◽  
X Ray ◽  
Depth Direction

In this study, the diffraction rings were measured point by point all over the head of rail sample which was used in service, and shearing stresses with respect to the depth direction were determined using the generalized cosα method. The full width at half maximum was also estimated from the diffraction ring.

scholarly journals X-Ray Diffraction Residual Stress Measurements for Assessment of Rolling Contact Fatigue Behaviour of Railway Steels

2014 ◽  
Vol 996 ◽  
pp. 782-787 ◽  
Author(s):  
António Castanhola Batista ◽  
Joao P. Nobre ◽  
Daniel F.C. Peixoto ◽  
Luis A.A. Ferreira ◽  
Paulo M.S.T. de Castro ◽  
...  
Keyword(s):  
Residual Stress ◽  
Cyclic Loading ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Fatigue Behaviour ◽  
Rolling Contact ◽  
X Ray Diffraction ◽  
X Ray ◽  
Before And After ◽  
Stress Profiles

Rolling contact fatigue twin-disc tests were performed on rail/wheel steels from Spanish high velocity trains (AVE). Residual stress profiles were determined using X-ray diffraction before and after cyclic loading. The evolution of residual stress profiles, due to cyclic loading, was analysed in order to study how they affect the rolling contact fatigue behaviour of these materials. This study is included in a major project where other related phenomena and materials’ properties have been studied.

Residual Stress in Railway Rails by IP/cosα Method

2006 ◽  
Vol 524-525 ◽  
pp. 381-386 ◽  
Author(s):  
Toshihiko Sasaki ◽  
Shunichi Takahashi ◽  
Kengo Iwfuchi ◽  
Yukio Satoh ◽  
Yoshikazu Kanematsu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Fatigue Damage ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
X Ray Diffraction ◽  
Present Measurement ◽  
X Ray ◽  
Fundamental Experiment

In this study, a new portable X-ray stress analyzer was designed and manufactured. The purpose of its use is to evaluate the rolling contact fatigue damage in rails for establishing an effective rail maintenance method. An image plate was used in this analyzer for detecting diffracted X-ray beams. The cosα method was adopted for X-ray stress analysis from X-ray diffraction data. A fundamental experiment was made first for examning the present measurement system. Residual stresses in rails used in service for six years were also investigated in this study.

Reconstruction of the rolling contact fatigue cracks in rails using X-ray computed tomography

2017 ◽  
Vol 92 ◽  
pp. 199-212 ◽  
Author(s):  
Meysam Naeimi ◽  
Zili Li ◽  
Zhiwei Qian ◽  
Yu Zhou ◽  
Jun Wu ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Fatigue Cracks ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
X Ray ◽  
X Ray Computed
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