Failure Observation of 3D-Printed Thrust Bearing Specimens at Cross Section Observations in Dry Conditions

2018 ◽  
Vol 777 ◽  
pp. 446-450 ◽  
Author(s):  
Koshiro Mizobe ◽  
Masahiro Inagaki ◽  
Katsuyuki Kida
Keyword(s):  
3D Printing ◽  
Fracture Behavior ◽  
Thrust Bearing ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Dry Conditions ◽  
Moving Direction ◽  
Bearing Race ◽  
3D Printed

3D printing methods are developing and they have become popular recently. 3D printing can easily make complex and seamless parts, however, there are questions about their strength. In particular, the strength of the places where the lamination layer joins is important. We performed rolling contact fatigue (RCF) tests in dry conditions using 3D-printed bearing race and observed the fracture behavior and cracks. We found that the main crack is related to the stress moving direction.

Failure Observation of 3D-Printed Thrust Bearing Specimens with Inner Defects in Water Conditions

2019 ◽  
Vol 814 ◽  
pp. 224-228
Author(s):  
Koshiro Mizobe ◽  
Tatsuki Atsumi ◽  
Katsuyuki Kida
Keyword(s):  
Additive Manufacturing ◽  
Thrust Bearing ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Water Bath ◽  
Water Conditions ◽  
3D Printed

Additive manufacturing (AM) methods are developing and have become popular, but questions remain about the strength of parts made by this method. We have already investigated the effect of the lamination direction on the fractures in bearing specimens. In this study, we made inner defects in the 3D-printed bearing specimens and performed rolling contact fatigue (RCF) tests on this specimens immersed in a water bath in order to investigate the fracture of 3D printed bearings.

scholarly journals Influence of groove shape on rolling contact fatigue of PEEK-PTFE hybrid radial bearings in dry conditions

2019 ◽  
Vol 264 ◽  
pp. 01005
Author(s):  
Masahiro Inagaki ◽  
Koshiro Mizobe ◽  
Katsuyuki Kida ◽  
Yuji Kashima
Keyword(s):  
Molecular Structure ◽  
Solid State ◽  
Nmr Spectroscopy ◽  
Temperature Rise ◽  
Solid State Nmr ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Thermal Failure ◽  
Dry Conditions

In this study, rolling contact fatigue (RCF) tests were performed in order to investigate the effect of groove radius on the life of PEEK-PTFE hybrid radial bearings. Furthermore, solid state NMR spectroscopy was performed in order to investigate the molecular structure of PEEK. It was found that groove radius shape was related to limitations of the bearings, and the molecular structure of the PEEK was not changed by the temperature rise in this test. Furthermore, thermal failure of the PEEK was not affected by oxidation during RCF test.

Rolling Contact Fatigue Observation of Radial PPS Bearings under Dry Condition

2016 ◽  
Vol 703 ◽  
pp. 197-201 ◽  
Author(s):  
Koshiro Mizobe ◽  
Toshihiko Matsumura ◽  
Yuji Kashima ◽  
Katsuyuki Kida
Keyword(s):  
Fatigue Behavior ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Fatigue Tests ◽  
Rolling Contact ◽  
Polyphenylene Sulfide ◽  
Material Structure ◽  
Suitable Material ◽  
Dry Conditions

Polyphenylene sulfide (PPS) is a suitable material for bearings which are used under dry conditions. We performed rolling contact fatigue tests using radial PPS bearings and investigated changes in the material structure and fatigue behavior under dry conditions. From these tests, we found that the bearings stop moving for two reasons: melting of wear tracks and build up of adhesion film on the surfaces in a race.

Friction Coefficient and Wear of PEEK-PTFE Hybrid Radial Ball Bearings under Dry Conditions

2021 ◽  
Vol 1020 ◽  
pp. 114-119
Author(s):  
Kazutoshi Hiraki ◽  
Koshiro Mizobe ◽  
Takahiro Matsueda ◽  
Yuji Kashima ◽  
Katsuyuki Kida
Keyword(s):  
Friction Coefficient ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Fatigue Tests ◽  
Rolling Contact ◽  
Frictional Heat ◽  
Wear Loss ◽  
Ball Bearings ◽  
Operation Temperature ◽  
Dry Conditions

In this paper, in order to investigate friction coefficient and wear of PEEK-PTFE hybrid radial bearings, rolling contact fatigue tests were performed under radial loads ranging from 93N to 387N at 600rpm in dry conditions. It was found that friction coefficients were 0.013 to 0.032 throughout the tests. Operation temperature followed the change in the friction coefficient, and PEEK-PTFE radial ball bearings exhibited stable performance even though the temperature locally approached 100 °C due to frictional heat. Moreover, wear loss of bearing components excluding alumina balls increased exponentially with increase of load.

911 Rolling Contact Fatigue Strength of Thrust Bearing Made of Newly Developed Bearing Steel

2006 ◽  
Vol 2006.44 (0) ◽  
pp. 359-360
Author(s):  
Hiroshi OHSAKI ◽  
Ryousuke ANO ◽  
Masahiro FUJII ◽  
Akira YOSHIDA ◽  
Toshiyuki KONDO
Keyword(s):  
Fatigue Strength ◽  
Thrust Bearing ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Bearing Steel ◽  
Rolling Contact ◽  
Contact Fatigue Strength

Influence of Radial Load on PEEK Plastic Bearings Life Cycle under Water Lubricated Conditions

2011 ◽  
Vol 217-218 ◽  
pp. 1260-1265 ◽  
Author(s):  
Hitonobu Koike ◽  
Takashi Honda ◽  
Katsuyuki Kida ◽  
Edson Costa Santos ◽  
Justyna Rozwadowska ◽  
...  
Keyword(s):  
Feed Rate ◽  
High Performance ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Wear Loss ◽  
Ball Bearings ◽  
Before And After ◽  
Dry Conditions ◽  
Market Needs

Radial ball bearings made of metal, ceramics and plastics are commonly used as important components in industrial machinery. Usage of high performance engineering plastic polymers is increasing progressively as a replacement for metal components due to the latest markets demands. Poly-ether-ether-ketone (PEEK) is a promising material for precision-machined custom bearings, products that are expected to suit special market needs. In the present study, PEEK radial ball bearings were manufactured by lathe machining under different parameters and their rolling contact fatigue (RCF) resistance under water lubricated conditions was investigated. We observed the surface of the bearings prior and after testing by laser confocal microscope. The wear loss was measured by weighing the bearings before and after test. Cracks and/or flaking failures were identified on the bearing surface after testing. From the RCF tests results, we found that, at water lubricated conditions, crack initiation occurred later in the material that was machined at slower feed rate while at dry condition, the feed rate had little influence on the wear loss and cracking. Wear loss in the case of bearings tested under water was much less severe than that of bearings tested at dry conditions.

Surface Profile Observation of PTFE Thrust Bearings under Rolling Contact Fatigue in Water

2013 ◽  
Vol 683 ◽  
pp. 391-395 ◽  
Author(s):  
Kiyoto Itakura ◽  
Takashi Honda ◽  
Shunsuke Oyama ◽  
Katsuyuki Kida ◽  
Shintaro Hazeyama ◽  
...  
Keyword(s):  
Rolling Contact Fatigue ◽  
Testing Machine ◽  
Contact Fatigue ◽  
Surface Profile ◽  
Rolling Contact ◽  
Wear Loss ◽  
Axial Loads ◽  
Before And After ◽  
Bearing Race ◽  
Dimensional Shape

The life of the PTFE thrust bearing under rolling contact fatigue (RCF) was investigated. The different conditions of axial loads and the rotating speeds under water were applied. The shapes of the bearing race before and after the tests were measured by a two-dimensional shape measurement sensor. The wear loss of PTFE bearing was rarely generated and the shape of the bearing changed slightly in the test. However, it was found that the lifetime of PTFE bearing depended on the temperature generated in the contact surface. In our testing machine condition, the bearing was collapsed over a load of 1600 N.

scholarly journals Rolling Contact Fatigue and Static Compression Deformation of UHMWPE thrust bearing in water

2017 ◽  
Vol 130 ◽  
pp. 09003
Author(s):  
Masahiro Inagaki ◽  
Naoki Fujimura ◽  
Koushiro Mizobe ◽  
Katsuyuki Kida ◽  
Yuji Kashima
Keyword(s):  
Thrust Bearing ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Static Compression ◽  
Compression Deformation
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