Related Experiment Video
Updated: Oct 18, 2025
08:23
A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
Published on: September 30, 2019
6.4K
Experimental Consideration of Conditions for Measuring Residual Stresses of Rails Using Magnetic Barkhausen Noise
Young-In Hwang1, Yong-Il Kim1,2, Dae-Cheol Seo1
1Safety Measurement Institute, Korea Research Institute of Standards and Science, 267, Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea.
Materials (Basel, Switzerland)
|September 28, 2021
Summary
Accurate measurement of residual stress in rails is crucial for safety. This study demonstrates the magnetic Barkhausen noise method effectively measures rail stress, aiding in preventing rail accidents.
Area of Science:
- Materials Science
- Mechanical Engineering
- Non-destructive Testing
Background:
- Residual stress significantly impacts rail fatigue and fracture properties.
- Rail damage accelerates with increased vehicle traffic and speed, posing safety risks.
- Accurate evaluation of residual stress in rails is vital for ensuring operational safety.
Purpose of the Study:
- To measure stresses in new rails under tensile load.
- To evaluate residual stresses in used rails.
- To validate the magnetic Barkhausen noise (MBN) method for rail stress analysis.
Main Methods:
- Selected optimal magnetization frequency and noise band for rail analysis.
- Applied tensile loads to rail specimens to measure stress via MBN.
- Measured residual stresses in the head parts of used rails.
Main Results:
- The magnetic Barkhausen noise method successfully measured applied tensile stresses in new rails.
- Verified the accuracy of the MBN method for stress analysis in rails.
- Analyzed asymmetric load distribution in used rails based on wheel-rail interaction.
Conclusions:
- The magnetic Barkhausen noise method is a viable technique for assessing residual stress in rails.
- This method can differentiate stress variations caused by operational loads.
- Findings contribute to improved rail integrity assessment and safety protocols.
Keywords:
magnetic Barkhausen noisemagnetic methodnon-destructive evaluation (NDE)railway railresidual stressstress measurementMore Related Videos
Related Concept Videos
01:14NMR Spectrometers: Resolution and Error Correction
818
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
818
01:17Magnetic Damping
628
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
628
01:30The Hall Effect
2.9K
Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
2.9K
01:22Motional Emf
3.4K
Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the...
3.4K