| Project/Area Number |
16560131
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Design engineering/Machine functional elements/Tribology
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| Research Institution | Hachinohe Institute of National Colleges of Technology |
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Principal Investigator |
AKAGAKI Tomoharu Hachinohe Institute of National Colleges of Technology, Department of Mechanical Engineering, Professor, 機械工学科, 教授 (20149909)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2005: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2004: ¥2,800,000 (Direct Cost: ¥2,800,000)
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| Keywords | Tribology / PEEK Composite Bearing / Wear Debris / Thermal Decomposition Analysis / Seizure / Lubricated Wear / SOAP Analysis / Condition Monitoring |
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| Research Abstract |
The friction and wear behaviors of PEEK composite were studied under severe lubricated conditions such as high load and high sliding velocity. Wear debris was analyzed using thermal decomposition analysis, spectrometric oil analysis procedure (SOAP), laser diffraction particle size analyzer and ferrographic technique. The following conclusions were obtained.
1.The sudden transit from mixed lubrication to seizure occurred at a certain load in both of white metal and PEEK composite, as the load increased.
2.The onset of seizure in PEEK composite was strongly dependent on the ring temperature. As the ring temperature reached about 100℃, the transition from fluid lubrication to mixed lubrication occurred. When it was over 180-190℃, seizure occurred.
3.Severe plastic flow and tearing type fracture were predominant on the wear scars of PEEK composite in seizure. Thus It was suggested that seizure caused severe plastic flow of PEEK material due to softening and melting at high temperature and might lead to failure of PEEK composite bearing.
4.Seizure could be characterized by generation of cylindrical, ribbon-like, plate-like and carbon fiber war debris. Most of them were less than a few tens micrometer in size.
5.The thermal decomposition analysis could detect PEEK wear debris because it was decomposed into phenol at high temperature. However, the amount of PEEK wear debris generated in laboratory test was only a few. In order to increase the detection accuracy, it is indispensable to develop new method for concentration of oil sample in a short time. This is the subject in future. Thus, it was suggested that the thermal decomposition analysis had a high potential as a failure diagnosis tool of PEEK composite bearing as well as other wear debris analysis.
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