13 Result(s)
within
A. A. Markov
Materials Science
Characterization and Evaluation of Materials
Structural Materials
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Article
Ultrasonic Multichannel Flaw Detector for Testing Rails with Signal Recording
Although automated testing instruments have been introduced intensely on the railways of Russia, up to 95% of hazardous flaws in rails are detected by ultrasonic two-line (removable) flaw detectors. The paper ...
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Article
A program for 3D simulation of signals for ultrasonic testing of specimens
Optimization of the parameters of schemes using multichannel ultrasonic flaw detectors for sonic testing of rails (sonic test schemes), as well as development of algorithms for processing test signals, are con...
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Article
Detection of flaws in the railhead by the mirror method under the condition of multiple reflection of ultrasonic oscillations
Issues of detection of flaws in the railhead by the echo and mirror methods are considered. The influence of the degree of rail wear on the path of propagating ultrasonic beams has been studied. It has been sh...
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Article
Evaluation of transverse cracks detection depth in MFL rail NDT
The limiting detection depth of subsurface defects is considered as an important efficiency factor of Magnetic Flux Leakage (MFL) method of railway nondestructive testing. This issue is particularly topical si...
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Article
A comparative analysis of the active and residual magnetization methods in the nondestructive testing of rails
The comparison of residual Magnetic Flux Leakage (MFL) with traditional MFL method was carried out as applied to rail nondestructive testing. The mechanisms for the residual magnetization of rails are consider...
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Article
Evaluation of the Size and Type of Flaws in a Railhead
The relevance of being able to detect flaws beneath horizontal exfoliations in rails with simultaneous measurement of crack parameters has been shown. Based on the performed research, the authors proposed a ne...
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Article
Detectability of Rail Defects by Magnetic Flux Leakage Method
The ability of the Magnetic Flux Leakage (MFL) method to detect flaws in railway rails in two different ways has been studied. First, a three-dimensional computer simulation of the leakage of magnetic flux aro...
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Article
Analyzing the Development of Rail Defects Based on Results of Multichannel Periodic Testing
Systems for nondestructive testing (NDT) of rails are multichannel and concurrently use several methods, including ultrasonic, magnetic flux leakage (MFL), visual, and others. Periodic inspection of rails does...
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Article
Analyzing Ultrasonic Signal Parameters during High-Speed Rail Inspection
The results of investigating the parameters of ultrasonic signals when increasing rail testing speed presented. Signals from rail bolt holes were selected as test reflectors. It is shown that the holes closest...
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Article
Analysis of the Parameters of Bottom Signals in the Area of Welded Joints of Rails under High-Speed Ultrasonic Testing
This research is a continuation of the work aimed at analyzing the parameters of ultrasonic signals during high-speed rail inspection. The analysis of the behavior of the amplitudes of the sequences of bottom ...
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Article
Dynamic Correction of Sensitivity of Flaw Detection Channels in High-Speed Rail Inspection
An increase in the reliability of high-speed ultrasonic testing of elongated objects, in particular, railroad rails, is considered. It is shown that the current regulatory documents do not take into account th...
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Article
Using a Magnetic Flux Leakage Method to Evaluate Gaps in Railroad Bolt Joints
Periodic evaluation of gaps in bolt joints of rails allows one to predict the reliability of a continuous welded rail track and prevent its temperature deformations. The purpose of the research is to find a si...
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Article
The Possibility of Detecting Defects in Rail Foot by the MFL Method
The article investigates the possibility of detecting defects in the form of transverse cracks in rail foot under continuous in-service inspection of rails. The MFL method is chosen as an alternative to ultras...
