Effect of Off-Center Magnetization Location on Changes in Magnetic Fields under Single Spherical Hertzian Contact

2012 ◽  
Vol 566 ◽  
pp. 103-108 ◽  
Author(s):  
Katsuyuki Kida ◽  
Megumi Uryu ◽  
Takashi Honda ◽  
Edson Costa Santos ◽  
Kenichi Saruwatari
Keyword(s):  
Magnetic Fields ◽  
Three Dimensional ◽  
Hertzian Contact ◽  
Hall Probe ◽  
Film Sensor ◽  
Contact Conditions ◽  
Before And After ◽  
Probe Microscope ◽  
Non Destructive ◽  
Destructive Methods

Tribological failure of machine components, such as wear and flaking failure is caused by contact stress concentration. However, observation of stress under contact load is a difficult task. Non-destructive methods that can be related to contact conditions are necessary to study and understand the phenomena caused by the contact stresses. In the present work, a scanning Hall probe microscope (SHPM) equipped with a GaAs film sensor was used to observe the three-dimensional magnetic fields in a long square bar specimen (JIS-SUJ2) before and after contact tests at 196N. It was found that the changes in the three-dimensional magnetic fields caused by spherical Hertzian contact are not affected by the location of the magnetization point on the specimen's surface.

Changes in Three Dimensional Magnetic Fields of Carbon Tool Steel (JIS-SKS93) under Single Spherical Hertzian Contact

2012 ◽  
Vol 457-458 ◽  
pp. 578-585 ◽  
Author(s):  
Katsuyuki Kida ◽  
Megumi Uryu ◽  
Takashi Honda ◽  
Edson Costa Santos ◽  
Kenichi Saruwatari
Keyword(s):  
Magnetic Fields ◽  
Tool Steel ◽  
Three Dimensional ◽  
Initial Distribution ◽  
Steel Plates ◽  
Hertzian Contact ◽  
Hall Probe ◽  
Forming Process ◽  
Film Sensor ◽  
Contact Conditions

Failure of dies and molds is caused by wear and deformation during the metal sheet forming process. Die wear takes various forms, and the contact conditions in die-parts affect the strength of the components. Non-destructive methods that can be related to contact conditions are necessary to study and understand the phenomena caused by the contact stresses. In the present work, a newly developed scanning Hall probe microscope (SHPM) equipped with a GaAs film sensor was used to observe the three-dimensional magnetic fields in tool steel plates before and after contact tests at room temperature in air. It was found that the intensity of three-dimensional magnetic fields is only slightly affected by the spherical Hertzian contact. However, all of the three-dimensional components of the magnetic fields change significantly. The extent of the changes depends not on the distribution of stress under spherical Hertzian contact but on the initial distribution of the magnetic fields.

Observation of Three Dimensional Magnetic Fields of Tool Steel (JIS-SKS93) around Vicker's Indentations

2013 ◽  
Vol 372 ◽  
pp. 265-269
Author(s):  
Katsuyuki Kida ◽  
Takashi Honda
Keyword(s):  
Plastic Deformation ◽  
Magnetic Fields ◽  
Crack Growth ◽  
Tool Steel ◽  
Three Dimensional ◽  
Hall Probe ◽  
Probe Microscope ◽  
Non Destructive ◽  
The Magnetic Field ◽  
Destructive Methods

Crack growth under cyclic loading causes failure of machine components. Non-destructive methods that can be related to plastic deformation around crack tip are necessary to study the crack growth. In the present work, a scanning Hall probe microscope (SHPM) equipped with GaAs film sensors was used to observe the magnetic fields around the plastic deformation induced by Vicker's indentations in tool steel specimens (SKS93, JIS B 4404: 2006, equivalent to AISI W4 tool steel). The magnetic field around a 2.94N-indentation was compared to that of a 294N-indentation. It was found that the decrease in the magnetic fields depends on the plastic deformation size.

Asymmetric Change in Three Dimensional Magnetic Fields of Bearing Steel (JIS-SUJ2) under Spherical Hertzian Contact

2012 ◽  
Vol 157-158 ◽  
pp. 1031-1037 ◽  
Author(s):  
Katsuyuki Kida ◽  
Megumi Uryu ◽  
Takashi Honda ◽  
Edson Costa Santos ◽  
Kenichi Saruwatari
Keyword(s):  
Magnetic Fields ◽  
Three Dimensional ◽  
Bearing Steel ◽  
Hertzian Contact ◽  
Asymmetric Distribution ◽  
Hall Probe ◽  
Contact Center ◽  
Film Sensor ◽  
Contact Conditions ◽  
Light Load

Flaking failure of bearings is caused by crack growth and stress concentration. The contact conditions between ball, retainer and race affect the durability of the bearings. Non-destructive methods that can be related to contact conditions are necessary to study and understand the phenomena caused by the contact stresses. In the present work, a scanning Hall probe microscope (SHPM) equipped with a GaAs film sensor was used to observe the asymmetric distribution of three-dimensional magnetic fields in bearing steel plates (JIS-SUJ2) before and after light load contact tests of 19.6N. It was found that only vertical components of the magnetic fields are slightly affected by the spherical Hertzian contact. Furthermore, the change in the three-dimensional magnetic fields is asymmetric to the contact center and magnetization center.

Observation of Magnetic Fields in Medium Carbon Low Alloy Steel JIS S45C under Point Contact Loading

2012 ◽  
Vol 566 ◽  
pp. 15-21 ◽  
Author(s):  
Megumi Uryu ◽  
Katsuyuki Kida ◽  
Takashi Honda ◽  
Edson Costa Santos ◽  
Kenichi Saruwatari
Keyword(s):  
Magnetic Fields ◽  
Point Contact ◽  
Steel Plates ◽  
Hertzian Contact ◽  
Hall Probe ◽  
Low Alloy Steels ◽  
Film Sensor ◽  
Medium Carbon ◽  
Before And After ◽  
Alloy Steels

In order to understand the phenomena caused by the contact stresses occurring within surface, non-destructive methods that can be related to contact conditions are necessary. The main purpose of this work is to study the relationship between magnetization location and direction, spherical Hertzian contact and changes in the magnetic field asymmetry. In the present work, we used a newly developed GaAs film sensor-equipped scanning Hall probe microscope (SHPM) and observed magnetic fields in tool steel plates before and after contact tests under 196N load, at room temperature in air. Medium carbon low alloy steels specimens (JIS S45C) were used in the experiments. Around the contact test area, changes in ‘S’ and ‘N’ poles generated by magnetization using a square magnet block were investigated.

Localization of Partial Magnetization around Artificial Slits in Square Bars of Medium Carbon Low Alloy Steel JIS S45C

2011 ◽  
Vol 217-218 ◽  
pp. 1297-1302 ◽  
Author(s):  
M. Uryu ◽  
Katsuyuki Kida ◽  
Takashi Honda ◽  
Edson Costa Santos ◽  
K. Saruwatari
Keyword(s):  
Stress Concentration ◽  
Three Dimensional ◽  
Hall Probe ◽  
Low Alloy Steels ◽  
Film Sensor ◽  
Medium Carbon ◽  
Alloy Steels ◽  
Probe Microscope ◽  
Non Destructive

Fatigue failure of steel occurs when cracks form and grow in the material’s stress concentration area. In order to understand the relation between stress concentration and crack propagation phenomena, non-destructive evaluation methods that can be related to in-situ measurements around the stress concentration area are necessary. In the present work, we developed a scanning Hall probe microscope (SHPM) equipped in a GaAs film sensor and observed three dimensional magnetic fields at room temperature in air. Medium carbon low alloy steels specimens (JIS, S45C) were used in the experiments. Only the area around the artificial slit had been magnetized and the effect of the magnetization area on the artificial slit was observed.

Changes in Magnetic Fields in Tool Steel (SKS93, JIS) under Single Tensile Load

2013 ◽  
Vol 307 ◽  
pp. 144-148 ◽  
Author(s):  
Katsuyuki Kida ◽  
Megumi Uryu ◽  
Takashi Honda ◽  
Teruaki Shimoji ◽  
Edson Costa Santos ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Tool Steel ◽  
Three Dimensional ◽  
Tensile Load ◽  
Steel Specimen ◽  
Tensile Loading ◽  
Hall Probe ◽  
Observation Methods ◽  
Probe Microscope ◽  
Non Destructive

Fatigue failure of machine components is caused by cyclic load. Non-destructive observation methods that can be related to stress are necessary to study the fatigue phenomena. In the present work, a three-dimensional scanning Hall probe microscope (SHPM) equipped with GaAs film sensors was used to observe the fundamental features of the magnetic fields in a tool steel specimen (SKS93, JIS B 4404: 2006, equivalent to AISI W4 tool steel) during tensile loading. The nature of the magnetic fields during tensile loadings of 430μstrain and 640μstrain was observed using the SHPM. It was found that the magnetic fields decrease due to the tensile loading.

Non-Destructive Stress Evaluation of Tool Steel Using Scanning Hall Probe Microscope: Effect of Stress Direction on Three Dimensional Magnetic Fields

2017 ◽  
Vol 741 ◽  
pp. 105-109
Author(s):  
Katsuyuki Kida ◽  
Ariyasu Yadoiwa ◽  
Takuto Yamada ◽  
Ryosuke Kawamura ◽  
Masayuki Ishida
Keyword(s):  
Magnetic Fields ◽  
Tensile Stress ◽  
Tool Steel ◽  
Three Dimensional ◽  
Physical Factors ◽  
Hall Probe ◽  
Stress Evaluation ◽  
Stress Direction ◽  
Probe Microscope ◽  
Non Destructive

Non-destructive stress measurement methods have been developed. However, there are a few approaches into the effect of stress direction on the nondestructive physical factors. In the present work, a non-destructive and non-contact method using three-dimensional magnet microscopy was applied to stress evaluation of an as-received tool steel (JIS, SKS93). Three-dimensional components of magnetic fields were observed using a scanning Hall probe microscope in order to find the important component which was related to the tensile stress. The observations were carried out under the tensile stress that was less than the yielding stress of the material. It was found that the magnetic field component that was parallel to a tensile loading direction was strongly correlated to stress values.

Changes in the Magnetic Fields of Star-Shaped JIS-SKS93 Plates Embedded in Clear Acrylic Cold Mounting Resin under Tensile Stress

2012 ◽  
Vol 457-458 ◽  
pp. 884-890
Author(s):  
Megumi Uryu ◽  
Katsuyuki Kida ◽  
Takashi Honda ◽  
Kenichi Saruwatari ◽  
Edson Costa Santos ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Stress Concentration ◽  
Magnetic Fields ◽  
Three Dimensional ◽  
Steel Specimen ◽  
Acrylic Resin ◽  
Steel Sample ◽  
Hall Probe ◽  
Film Sensor ◽  
The Magnetic Field

Fatigue failure of machine components occurs when cracks form in the stress concentration area and propagate under continued loading during component work. In order to understand the relation between the phenomena of stress concentration and crack propagation, non-destructive evaluation methods using in-situ measurements in the stress concentration areas are necessary. In the present work, a scanning Hall probe microscope (SHPM) equipped with a GaAs film sensor was developed and the three dimensional magnetic fields were observed at room temperature in air. The effect of stress on the changes in the magnetic field in steel components is reported. A steel specimen (JIS SKS93) embedded in acrylic resin were strained at different loads and the magnetic field before and after straining were observed. The obtained magnetic images clearly corresponded with the shape of the steel plate. It was possible to measure the changes in the magnetic field of the steel sample after straining under tensile loading, by neutralizing the initial magnetic field of the specimens prior to testing.

Effects of Magnetizations on Three Dimensional Magnetic Flux Density of Pre-Cracked Medium Carbon Low Alloy Steel (JIS S45C)

2011 ◽  
Vol 83 ◽  
pp. 230-236 ◽  
Author(s):  
Katsuyuki Kida ◽  
Edson Costa Santos ◽  
Takashi Honda ◽  
Hitonobu Koike ◽  
Justyna Rozwadowska ◽  
...  
Keyword(s):  
Fatigue Cracks ◽  
Three Dimensional ◽  
Magnetic Flux Density ◽  
Hall Probe ◽  
Low Alloy Steels ◽  
Film Sensor ◽  
Medium Carbon ◽  
Alloy Steels ◽  
Crack Tips ◽  
Probe Microscope

Fatigue failure of steel occurs when cracks form in a component and continue to grow to a size large enough to cause rupture. In order to understand the crack initiation and propagation phenomena, non-destructive evaluation methods that can be correlated to in-situ measurements around the crack tips are necessary. In the present work, we developed a scanning Hall probe microscope (SHPM) equipped in a GaAs film sensor to observe fatigue cracks at room temperature in air while they were growing. Medium carbon low alloy steels specimens (JIS S45C) were used in the experiments. Only the area around the crack tip was magnetized and the changes at the crack tips were observed.

Changes in Three Dimensional Magnetic Fields of Carbon Tool Steel (JIS-SKS93) under Single Spherical Hertzian Contact

2012 ◽  
Vol 457-458 ◽  
pp. 578-585
Author(s):  
Katsuyuki Kida ◽  
Megumi Uryu ◽  
Takashi Honda ◽  
Edson Costa Santos ◽  
Kenichi Saruwatari
Keyword(s):  
Magnetic Fields ◽  
Tool Steel ◽  
Three Dimensional ◽  
Hertzian Contact
Sign in / Sign up

Export Citation Format

Share Document