Internal Shear Stress Distribution and Subsurface Cracks of PPS Thrust Bearings under Rolling Contact Fatigue in Water

2020 ◽  
Vol 858 ◽  
pp. 101-105
Author(s):  
Syunsuke Mizozoe ◽  
Katsuyuki Kida
Keyword(s):  
Shear Stress ◽  
Stress Distribution ◽  
Crack Propagation ◽  
Contact Stress ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Subsurface Crack ◽  
Thrust Bearings ◽  
Subsurface Cracks

In this study, crack propagation in PPS thrust bearings under rolling contact fatigue (RCF) in water was observed, and relation between subsurface crack and internal shear stress parallel to the surface was investigated. It was found the cause of flaking was subsurface crack. They were evaluated in terms of contact stress and friction between their faces. It was discovered that subsurface cracks distributed around shear stress peak, and flaking failure was dominated by subsurface shear stress.

Subsurface Stress Distribution and Failure of PPS Thrust Bearings under Rolling Contact Fatigue in Water

2019 ◽  
Vol 814 ◽  
pp. 152-156 ◽  
Author(s):  
Xiao Chen Shi ◽  
Akihiro Adachi ◽  
Katsuyuki Kida
Keyword(s):  
Fatigue Crack ◽  
Stress Distribution ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Polymer Materials ◽  
Thrust Bearings ◽  
Subsurface Stress

In recent years, environments of bearings and polymer materials have been more and more attractive due to several advantages against ordinary metal material. However, there is still room for the further study about strength of polymer bearings. One of questions is the mechanism of fatigue crack propagation, which is the main cause of the damage of polymer bearings under rolling contact with lubricant, like water. In this study, subsurface stress distribution and failure of PPS thrust bearings under rolling contact fatigue in water are discussed to understand the detail of the crack propagation.

Observation of Surface and Subsurface Crack Propagation in PPS Thrust Bearings under Rolling Contact Fatigue in Water

2021 ◽  
Vol 1020 ◽  
pp. 120-125
Author(s):  
Syunsuke Mizozoe ◽  
Takahiro Matsueda ◽  
Katsuyuki Kida ◽  
Yuji Kashima
Keyword(s):  
Crack Propagation ◽  
Contact Area ◽  
Rolling Contact Fatigue ◽  
Rolling Direction ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Direction Parallel ◽  
Thrust Bearings ◽  
Subsurface Cracks ◽  
Circular Cracks

In this study, crack propagation in PPS thrust bearings under rolling contact fatigue (RCF) in water was observed in order to investigate the relation between cracks and flakings. RCF tests in water under loads of 700 N and 900 N were performed. The semi-circular cracks propagated in a direction perpendicular to the rolling direction were observed under a load of 700 N. The line cracks propagated in a direction parallel to the rolling direction at periphery of contact area and the semi-circular cracks were observed under a load of 900 N. To study the subsurface cracks, full section of rolling contact area was observed. It is concluded that the flaking mechanism in PPS thrust bearing has three features as follows: Initiation and propagation of surface cracks depend on the load; When load is 700N, the semi-circular cracks growing from the surface and the cracks branching from the main subsurface cracks join to form the flaking; When load is 900N the line cracks and the semi-circular cracks growing from the surface join to form the flaking.

Surface Observation of PPS Thrust Bearings under Rolling Contact Fatigue in Water

2014 ◽  
Vol 563 ◽  
pp. 270-274 ◽  
Author(s):  
Xiao Chen Shi ◽  
Yuji Kashima ◽  
Katsuyuki Kida
Keyword(s):  
Crack Propagation ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Wear Loss ◽  
Heavy Load ◽  
Thrust Bearings ◽  
Surface Failure ◽  
Detailed Surface ◽  
The Relationship

There were two procedure about surface failure in rolling contact fatigue (RCF), wear and crack propagation. In our previous study, it was concluded that the main reason for PPS bearings failure in water was flaking due to surface crack propagation. The relationship between wear loss, rotation speed and thrust load of PPS bearings under RCF in water was investigated. In this study, the detailed surface profiles under heavy load were studied by using both LCM and two-dimensional measurement sensor to study the process of flaking failure.

scholarly journals Subsurface Crack Propagation from Internal Defect in Rolling Contact Fatigue of Railway Wheel Steel

2019 ◽  
Vol 68 (12) ◽  
pp. 904-909
Author(s):  
Takanori KATO ◽  
Takashi FUJIMURA ◽  
Shinichiro HIRAMATSU ◽  
Yuichiro YAMAMOTO
Keyword(s):  
Crack Propagation ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Wheel Steel ◽  
Subsurface Crack ◽  
Internal Defect ◽  
Railway Wheel ◽  
Railway Wheel Steel

Evaluation of Internal Crack Growth of PPS Thrust Bearings under Rolling Contact Fatigue in Water

2021 ◽  
Vol 888 ◽  
pp. 77-81
Author(s):  
Shintaro Kanagawa ◽  
Takahiro Matsueda ◽  
Katsuyuki Kida ◽  
Yuji Kashima
Keyword(s):  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Internal Crack ◽  
Subsurface Crack ◽  
Direction Parallel ◽  
Thrust Bearings ◽  
Full Cross Section ◽  
Observation Method ◽  
Circular Cracks

In this study, in order to evaluate the progress of internal cracks in PPS thrust bearings under rolling contact fatigue in water, cracks were observed by a full-cross-section observation method using a lathe machining. “Main subsurface crack” initiated at the surface toward the inside, then grew in a direction parallel to the surface. They connected with many “Semi-circular cracks” initiating at the surface from the opposite side to the inside, to from a semi-ellipsoidal flaking damage. It was found that the “Semi-circular cracks” and the “Main subsurface crack” dominated the flaking destruction.

Observation of Subsurface Crack of Carburized Steel (SCM415) under Single-Ball Rolling Contact Fatigue over 107 Cycles

2019 ◽  
Vol 298 ◽  
pp. 19-23
Author(s):  
Masato Fukuda ◽  
Koshiro Mizobe ◽  
Katsuyuki Kida
Keyword(s):  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Subsurface Crack ◽  
Subsurface Cracks ◽  
Carburized Steel ◽  
Ball Rolling

Bearing fails due to the flaking failure which is caused by the subsurface cracks. The observation of the subsurface cracks is not easy beacause the cracks propagate inside the material. In order to observe the whole subsurface cracks, we performed rolling contact fatigue (RCF) tests of carburized SCM415 until over 107 cycles with the single-ball RCF machine. After the RCF tests, we directly observed the subsurface cracks.

Subsurface crack propagation under rolling contact fatigue in bearing ring

2013 ◽  
Vol 56 (10) ◽  
pp. 2422-2432 ◽  
Author(s):  
Song Deng ◽  
XingHui Han ◽  
XunPeng Qin ◽  
Song Huang
Keyword(s):  
Crack Propagation ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Subsurface Crack ◽  
Bearing Ring

Crack Observation of PPS Polymer Thrust Bearings under RCF Test in Water

2016 ◽  
Vol 703 ◽  
pp. 178-182
Author(s):  
Xiao Chen Shi ◽  
Masatoshi Ando ◽  
Yuji Kashima ◽  
Katsuyuki Kida
Keyword(s):  
Crack Propagation ◽  
Cross Sections ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Low Friction ◽  
High Corrosion Resistance ◽  
Thrust Bearings ◽  
Bearing Failures ◽  
Polymer Bearing

Polymer bearings are widely used under certain environments due to the advantages on light weight, low friction coefficient, high corrosion resistance and electric insulation. The main reason for polymer bearing failures in water was formation of flakings due to crack propagation. However, the mechanism of fatigue crack propagation in polymer material under rolling contact condition has not been clearly explained yet. In the present study, detailed crack observations were made on cross sections along both radial and rolling directions after RCF (Rolling Contact Fatigue) test in water using PPS thrust bearings.

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