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3 Zeszyty Naukowe. Mechanika / Politechnika Opolska

3 2011

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The influence of stress conditions on the magnetic fields around fatigue crack tip in tool steel

Honda T., Kida K., Santos E.C., Rozwadowska J., Uryu M.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2011

z. 99

21-23

Fatigue of steel components occurs when small cracks form and continue to grow to a size large enough to cause failure. Detecting the cracks and determining whether the cracks will cause failure is very important for developing reliability of steel components. We applied a non-destructive method of in- vestigation and focused on the magnetic fields occurring around the cracks. In our previous study, in order to measure the changes in the magnetic flux density, we developed a scanning Hall probe microscope (SHPM) equipped in a GaAs film and observed fatigue cracks at room temperature in air as they grew. we found that the magnetic fields around the crack tips change during crack growth. In order to further understand this phenomena, in this paper, we report the influence of stress conditions on the changes in the magnetic fields around fatigue crack tip in JIS SKS 93 high carbon tool steel.

Rolling contact fatigue of Ti64 bearings before and after laser gas nitriding

Santos E.C., Kida K., Rozwadowska J., Kashima Y.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2011

z. 99

50-52

Due to their biocompatibility and high strength-to-weight ratio titanium and Ti alloys are widely used in high end application in the medical and aeronau- tical industries. The materials` low wear resistance presents a disadvantage that is approached in this work. In order to enhance the rolling contact fa- tigue properties of the bearings` working surface, a laser coating technique was used. Non-coated and coated specimens were tested in equal conditions and it was found that layers of titanium nitride significantly improve the rolling contact fatigue performance of titanium components.

Development of a fatigue testing machine to study crack initiation and propagation in high carbon high strength steel during rolling contact

Rozwadowska J., Kida K., Santos E.C., Honda T., Kanemasu K., Hashimoto K.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2011

z. 99

46-48

An innovative type of one-point rolling contact fatigue (RCF) machine was developed to investigate crack initiation and propagation in metals. The microstructural changes and propagation of subsurface cracks during rolling contact in specimens tested by using the new device were studied by laser confocal microscope and X-ray diffraction. It was shown that this new method presents several important advantages compared to the conventional thrust type RCF machines.