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.

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.

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.

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.

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.

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 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

Three-dimensional observation of magnetic fields in alloy tool steel under spherical Hertzian contact

2014 ◽  
Vol 18 (sup1) ◽  
pp. S1-71-S1-75
Author(s):  
K. Kida ◽  
M. Uryu ◽  
T. Honda ◽  
E. C. Santos ◽  
K. Saruwatari
Keyword(s):  
Magnetic Fields ◽  
Tool Steel ◽  
Three Dimensional ◽  
Hertzian Contact ◽  
Alloy Tool

High-temperature constitutive model for three-dimensional needled C/C-SiC composite under tensile loading

2016 ◽  
Vol 51 (18) ◽  
pp. 2619-2629 ◽  
Author(s):  
Junbo Xie ◽  
Guodong Fang ◽  
Zhen Chen ◽  
Jun Liang
Keyword(s):  
High Temperature ◽  
Constitutive Model ◽  
Three Dimensional ◽  
Tensile Load ◽  
Tensile Loading ◽  
Testing Temperature ◽  
Tensile Behavior ◽  
Effect Of Temperature ◽  
Stress Strain ◽  
Nonlinear Stress

Tensile experiments of three-dimensional needled C/C-SiC composite from room temperature to 1800℃ were performed to investigate tensile behavior. The damage characteristics and macroscopic mechanical behavior of the composite are relevant to the testing temperature and off-axis angles of the tensile loading. The tensile strength increased while the modulus decreased with the increase of temperature. A high-temperature nonlinear constitutive model was established to analyze the nonlinear stress–strain relationship of the composite. Plastic strain accumulation and stiffness degeneration were described by the plasticity and damage theories. The effect of temperature on the tensile behavior of the composite was particularly considered in this model by introducing a thermal damage variable. The proposed constitutive model can predict the stress–strain behavior of the material subjected to different off-axis tensile load, and at different temperatures. Fairly good agreement was achieved between the predicted and experimental results.

The Influence of Stress Ratio on Changes in Magnetic Flux Density around Fatigue Crack Tips of Carbon Tool Steel

2011 ◽  
Vol 83 ◽  
pp. 210-215 ◽  
Author(s):  
Takashi Honda ◽  
Katsuyuki Kida ◽  
Edson Costa Santos ◽  
Hitonobu Koike ◽  
Justyna Rozwadowska ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Crack Growth ◽  
Flux Density ◽  
Tool Steel ◽  
Fatigue Cracks ◽  
Three Dimensional ◽  
Magnetic Flux Density ◽  
Hall Probe ◽  
Steel Component ◽  
Stress Ratios

Fatigue failure of steel occurs when cracks form in a component and continue to grow to a size large enough to cause fracture. In order to understand the strength of a steel component, it is important to locate these cracks. We developed a scanning Hall probe microscope (SHPM), equipped with GaAs film sensors to observe fatigue cracks at room temperature in air while they were growing. In our previous works [1,2], the correlation between crack growth and magnetic field in high carbon tool steels (JIS SKS93 and JIS SUJ2) were determined. We also reported the sensitivity of the SHPM equipped with a three-dimensional line-probe that was developed to decrease the sensor gaps. By using the line-probe sensor we succeeded to measure the magnetic flux density distributions in very close proximity to the specimen’s surface. However, in order to further understand the relation between magnetic flux density and crack growth, other materials, microstructures and fatigue test conditions should be evaluated. In the present work, we focus on the effect of stress ratios on the changes of the magnetic flux density in annealed carbon tool steel.

Sign in / Sign up

Export Citation Format

Share Document