scholarly journals Attenuation of Barkhausen Noise Emission due to Variable Coating Thickness

Coatings ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 263
Author(s):  
Katarína Zgútová ◽  
Martin Pitoňák
Keyword(s):  
Corrosion Resistance ◽  
Stress State ◽  
Magnetic Fields ◽  
Tensile Stress ◽  
Coating Thickness ◽  
Barkhausen Noise ◽  
Noise Emission ◽  
The Real ◽  
And Shifts ◽  
The Relationship

Monitoring of the stress state of bridges by the use of the Barkhausen noise technique has been already introduced and this method can be adapted for monitoring of component’s overstressing. Measurement of Barkhausen noise on real bridges is carried out through the coating applied as a layer to increase the corrosion resistance of bodies. However, it was found that the thickness of the coating could vary, which in turn affects the Barkhausen noise signals and makes it difficult to assess the real stress state. For this reason, this paper deals with attenuation of Barkhausen noise emission due to variable thicknesses of coatings on the steel S460MC. It was found that increasing the thickness progressively decreases the Barkhausen noise emission and shifts the Barkhausen noise envelopes to the higher magnetic fields. Furthermore, the thickness of the coating also affects the relationship between the tensile stress and the Barkhausen noise.

scholarly journals Assessment of Tendon Prestressing after Long-Term Service via the Barkhausen Noise Technique

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3450 ◽  
Author(s):  
Miroslav Neslušan ◽  
František Bahleda ◽  
Martin Moravčík ◽  
Katarína Zgútová ◽  
Filip Pastorek
Keyword(s):  
Stress State ◽  
Noise Signal ◽  
Barkhausen Noise ◽  
Highway Bridge ◽  
Noise Emission ◽  
Laboratory Assessment ◽  
The Real

This paper deals with the assessment of a real prestressed tendon by the use of Barkhausen noise emission. The tendon was obtained from a real highway bridge after 33 years in service. Barkhausen noise is studied as a function of the stress state, and the Barkhausen noise signals received directly from the tendon on the real bridge are compared with the Barkhausen noise signals received from the tendon during loading in the laboratory. Assessment of the prestressing is based on the analysis of the effective value of the Barkhausen noise signal as well as the position in which the Barkhausen noise envelopes attain a maximum.

Investigation of Welded Joints Made of Construction Steel by the Barkhausen Noise Method

2020 ◽  
Vol 992 ◽  
pp. 957-963
Author(s):  
E. Nikolaeva ◽  
A. Nikolaev
Keyword(s):  
Stress State ◽  
Residual Stresses ◽  
Welded Joints ◽  
Arc Welding ◽  
Barkhausen Noise ◽  
Low Carbon ◽  
Butt Weld ◽  
Welded Structures ◽  
The Relationship ◽  
Weld Seams

Steel weld seams are characterized by heterogeneity of their microstructure. Microstructure affects the nature of the distribution, sign and magnitude of residual stresses. In combination with unfavorable factors (low temperature, metal hypoductility and an unsuccessful joint form) residual stresses lead to a decrease of load carrying capacity of a whole structure. In a weld seam residual stresses are distributed in a complex way and can affect the build quality of heavy section welded structures. Monitoring of residual stresses remains a big problem. Residual stresses in welds are often evaluated only by modeling. Unfortunately, all mathematical models describe the stress state of the welded material with low accuracy. Simple quality control, the results of which can be easy interpreted, is necessary. Welded joints made by manual arc welding and by automatic submerged arc welding were investigated. Butt seams of steel sheets of different thickness have been welded. Steel was low-carbon and low-alloyed. It is often used in welded structures for various purposes, including construction, and for pipelines manufacture. The temperature range of welded structures operation is very large – from-70 to 450С. The authors studied the structure of butt weld seams by the Barkhausen noise method, which is interesting as it represents an alternative to the known methods, which characterizes the structure and stress state of material. The relationship between the weld microstructure and magnetic noise is shown. Studies have allowed us to establish the relationship between the structure and magnetic properties and to evaluate the feasibility of applying the Barkhausen noise method to welded structures.

scholarly journals Non-Destructive Evaluation of Steel Surfaces after Severe Plastic Deformation via the Barkhausen Noise Technique

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1029 ◽  
Author(s):  
Miroslav Neslušan ◽  
Libor Trško ◽  
Peter Minárik ◽  
Jiří Čapek ◽  
Jozef Bronček ◽  
...  
Keyword(s):  
Shot Peening ◽  
Progressive Increase ◽  
Noise Signal ◽  
Barkhausen Noise ◽  
Noise Emission ◽  
Non Destructive Evaluation ◽  
Almen Intensity ◽  
The Relationship ◽  
Non Destructive ◽  
Severe Shot Peening

This paper reports about the non-destructive evaluation of surfaces after severe shot peening via the Barkhausen noise technique. Residuals stresses and the corresponding Almen intensity, as well as microstructure alterations, are correlated with the Barkhausen noise signal and its extracted features. It was found that residual stresses as well as the Barkhausen noise exhibit a valuable anisotropy. For this reason, the relationship between the Barkhausen noise and stress state is more complicated. On the other hand, the near-the-surface layer exhibits a remarkable deformation induced softening, expressed in terms of the microhardness and the corresponding crystalline size. Such an effect explains the progressive increase of the Barkhausen noise emission along with the shot-peening time. Therefore, the Barkhausen noise can be considered as a promising technique capable of distinguishing between the variable regimes of severe shoot peening.

Stress Measurement in Carbon Steel by Magnetic Barkhausen Noise Technique

2017 ◽  
Vol 751 ◽  
pp. 213-218
Author(s):  
Mai Noipitak
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Carbon Steel ◽  
Tensile Stress ◽  
Treatment Process ◽  
Stress Measurement ◽  
Barkhausen Noise ◽  
Heat Treatment Process ◽  
Magnetic Barkhausen Noise ◽  
The Relationship

The Magnetic Barkhausen Noise (MBN) technique can evaluate the residual stresses in carbon steel and provide information about the relationship between residual stress level and MBN signal. This research work is based on the analysis of MBN signals obtained from carbon steel samples. ASTM A36 and A516 carbon steel were used to vary the residual stress by heat treatment process with 5 conditions: annealing, normalizing, quenching in oil, quenching in water and quenching in salt water. The microstructure and hardness of samples also were varied by these heat treatment processes. Twelve samples (including base materials) were cut to analyze the microstructure and hardness by the microscope and hardness testing machine. Reference materials from each condition were established to represent the MBN signals. The MBN technique was used to evaluate the residual stresses from heat treatment process on each reference material. Then each sample was prepared to tensile specimen. All specimens were applied static tension load below yield point. The load was increased at 25 N/mm2 (MPa) in increment. Each tensile stress level was measurement by MBN technique at 0 and 90 degree of direction of tension axis. The experimental results found that the MBN signal amplitude changed as the condition of heat treatment changed and the relationship between tensile stress and MBN signal showed linear correlation. This research is useful to understand and guide for establishing the reference materials for residual stress measurement by MBN technique.

scholarly journals Employment of Barkhausen Noise Technique for Assessment of Prestressing Bars Damage with Respect of Their Over-Stressing

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 770
Author(s):  
František Bahleda ◽  
Ivan Drevený ◽  
Martin Pitoňák ◽  
Miroslav Neslušan ◽  
Peter Koteš
Keyword(s):  
Tensile Stress ◽  
Residual Stresses ◽  
Magnetic Anisotropy ◽  
Perpendicular Direction ◽  
Barkhausen Noise ◽  
Noise Emission ◽  
Steep Increase ◽  
Non Destructive

This paper investigates the potential of a non-destructive magnetic technique based on Barkhausen noise emission for the monitoring of prestressing bars with respect to their undesired over-stressing. Barkhausen noise signals are correlated with tensile stress, residual stresses, and microhardness measurements. It was found that prestressing bars exhibit strong magnetic anisotropy which becomes more pronounced along with the increasing degree of the bar’s over-stressing. Barkhausen noise emission becomes strongly attenuated in the direction of the tensile stress at the expense of the perpendicular direction. However, the Barkhausen noise emission in the direction of the tensile stress exhibits a continuous and remarkable decrease, whereas the Barkhausen noise steep increase for lower degrees of over-stressing is followed by early saturation for higher over-stressing. This study demonstrates that the Barkhausen noise technique is capable of distinguishing between the prestressing bars loaded below yielding, and those which are over-stressed.

Practical High Resolution Microscopy

1968 ◽  
Vol 26 ◽  
pp. 302-303
Author(s):  
P. A. Marsh ◽  
T. Mullens ◽  
D. Price
Keyword(s):  
High Resolution ◽  
Magnetic Fields ◽  
Low Frequency ◽  
Resolving Power ◽  
Careful Attention ◽  
Electron Microscopes ◽  
The Relationship ◽  
High Resolution Microscopy ◽  
New Facilities

It is possible to exceed the guaranteed resolution on most electron microscopes by careful attention to microscope parameters essential for high resolution work. While our experience is related to a Philips EM-200, we hope that some of these comments will apply to all electron microscopes.The first considerations are vibration and magnetic fields. These are usually measured at the pre-installation survey and must be within specifications. It has been our experience, however, that these factors can be greatly influenced by the new facilities and therefore must be rechecked after the installation is completed. The relationship between the resolving power of an EM-200 and the maximum tolerable low frequency interference fields in milli-Oerstedt is 10 Å - 1.9, 8 Å - 1.4, 6 Å - 0.8.

Joshua Kates, Essential History: Jacques Derrida and the Development of Deconstruction (Evanston, Illinois: Northwestern University Press, 2005), 352pp, $29.95 (USD), ISBN 10: 0810123274, ISBN-13: 978-0810123274

Derrida Today ◽  
2008 ◽  
Vol 1 (1) ◽  
pp. 131-133
Author(s):  
Gary Banham
Keyword(s):  
Jacques Derrida ◽  
The Real ◽  
Northwestern University ◽  
Relationship Of ◽  
The Relationship

This book promises a ‘radical reappraisal’ (Kates 2005, xv) of Derrida, concentrating particularly on the relationship of Derrida to philosophy, one of the most vexed questions in the reception of his work. The aim of the book is to provide the grounds for this reappraisal through a reinterpretation in particular of two of the major works Derrida published in 1967: Speech and Phenomena and Of Grammatology. However the study of the development of Derrida's work is the real achievement of the book as Kates discusses major works dating from the 1954 study of genesis in Husserl's phenomenology through to the essays on Levinas and Foucault in the early 1960's as part of his story of how Derrida arrived at the writing of the two major works from 1967.

scholarly journals Adaptive Model for Biofeedback Data Flows Management in the Design of Interactive Immersive Environments

2021 ◽  
Vol 11 (11) ◽  
pp. 5067
Author(s):  
Paulo Veloso Gomes ◽  
António Marques ◽  
João Donga ◽  
Catarina Sá ◽  
António Correia ◽  
...  
Keyword(s):  
Real Time ◽  
Emotional State ◽  
Adaptive Model ◽  
Multimodal Data ◽  
The Real ◽  
Time Interaction ◽  
Data Flows ◽  
Immersive Systems ◽  
Immersive Environment ◽  
The Relationship

The interactivity of an immersive environment comes up from the relationship that is established between the user and the system. This relationship results in a set of data exchanges between human and technological actors. The real-time biofeedback devices allow to collect in real time the biodata generated by the user during the exhibition. The analysis, processing and conversion of these biodata into multimodal data allows to relate the stimuli with the emotions they trigger. This work describes an adaptive model for biofeedback data flows management used in the design of interactive immersive systems. The use of an affective algorithm allows to identify the types of emotions felt by the user and the respective intensities. The mapping between stimuli and emotions creates a set of biodata that can be used as elements of interaction that will readjust the stimuli generated by the system. The real-time interaction generated by the evolution of the user’s emotional state and the stimuli generated by the system allows him to adapt attitudes and behaviors to the situations he faces.

scholarly journals Inheritance and reflection: “re-study” of three anthropology fieldwork sites in China’s Yunnan Province

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Mingming Wang
Keyword(s):  
Rural Society ◽  
Research Report ◽  
Ancestor Worship ◽  
Land System ◽  
Peking University ◽  
The Difference ◽  
And Shifts ◽  
West Town ◽  
The Relationship

AbstractThis article is a research report involving three anthropological studies conducted during the period of “Kuige” and their “re-studies.” By narrating the project, I set forth my views on the connections and differences between Chinese anthropological explorations from two historical periods. These anthropological explorations refer to the study of Lu Village conducted by Fei Xiaotong, that of “West Town” (Xizhou) by Francis L. K. Hsu, and that of “Pai-IPai” (Dai) villages by Tien Ju-Kang. They were all completed in the late 1930s and early 1940s. Each writer extracted a framework to analyze the land system, ancestor worship, and the relationship between humans and gods from the writer’s own field experience. Despite the difference in research methods, all three studies noticed the cultural differences between rural society and modernity. Since 2000, Peking University and Yunnan Minzu University have launched a “Province-university Cooperation Project.” During the project, a research team formed of several young scholars revisited Lu Village, “West Town” (Xizhou), and Namu Village. These writers’ works were based on the data acquired in their fieldwork and drew upon the opinions raised by global anthropologists on “re-study” in recent decades. Considering the dual effects of social change and shifts in academic concepts around “follow-up research,” the scholars put forward several points of view with their ethnographies, which all featured the characteristics of inheritance and reflection. Based on the results of the three “re-studies,” this article emphasizes the importance of the study of public rituals for the research of rural society. This article also attempts to re-examine the methodology of “human ecology,” which profoundly impacts Chinese anthropology and sociology.

scholarly journals Time-Response-Histogram-Based Feature of Magnetic Barkhausen Noise for Material Characterization Considering Influences of Grain and Grain Boundary under In Situ Tensile Test

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2350
Author(s):  
Jia Liu ◽  
Guiyun Tian ◽  
Bin Gao ◽  
Kun Zeng ◽  
Yongbing Xu ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Tensile Stress ◽  
Material Properties ◽  
Ferromagnetic Material ◽  
Silicon Steel ◽  
Time Response ◽  
Barkhausen Noise ◽  
Time Interval ◽  
Magnetic Barkhausen Noise

Stress is the crucial factor of ferromagnetic material failure origin. However, the nondestructive test methods to analyze the ferromagnetic material properties’ inhomogeneity on the microscopic scale with stress have not been obtained so far. In this study, magnetic Barkhausen noise (MBN) signals on different silicon steel sheet locations under in situ tensile tests were detected by a high-spatial-resolution magnetic probe. The domain-wall (DW) motion, grain, and grain boundary were detected using a magneto-optical Kerr (MOKE) image. The time characteristic of DW motion and MBN signals on different locations was varied during elastic deformation. Therefore, a time-response histogram is proposed in this work to show different DW motions inside the grain and around the grain boundary under low tensile stress. In order to separate the variation of magnetic properties affected by the grain and grain boundary under low tensile stress corresponding to MBN excitation, time-division was carried out to extract the root-mean-square (RMS), mean, and peak in the optimized time interval. The time-response histogram of MBN evaluated the silicon steel sheet’s inhomogeneous material properties, and provided a theoretical and experimental reference for ferromagnetic material properties under stress.

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