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C. K. Mukhopadhyay

Bio: C. K. Mukhopadhyay is an academic researcher from Indira Gandhi Centre for Atomic Research. The author has contributed to research in topics: Acoustic emission & Deformation (engineering). The author has an hindex of 17, co-authored 85 publications receiving 794 citations. Previous affiliations of C. K. Mukhopadhyay include Homi Bhabha National Institute & University of Nevada, Las Vegas.


Papers
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TL;DR: In this paper, the application of acoustic emission technique (AET) for on-line monitoring of various forming processes such as punch stretching, drawing, blanking, forging, machining and grinding has been reviewed and discussed.

70 citations

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TL;DR: In this article, a model based design optimisation of PEC probe for the detection of sub-surface defects located more than 4mm from surface in a 8mm thick AISI type 316 stainless steel plate is presented.
Abstract: Pulsed eddy current (PEC) technique is used for the detection of sub-surface defects in electrically conducting materials. In order to extend the application of PEC technique for the detection of defects in thick non-magnetic materials, the detection sensitivity of the probe need to be enhanced. Detection sensitivity of the probe mainly depends on the probe configuration. In view of this, optimisation of probe configuration for deeper penetration of magnetic field in the material is carried out through finite element modelling. Present study focuses on model based design optimisation of PEC probe for the detection of sub-surface defects located more than 4 mm from surface in a 8 mm thick AISI type 316 stainless steel plate. The performance of ferrite cored absolute probe, ferrite cored send-receive probe and ferrite cored send-receive probe with outer shielding has been compared and optimised probe has been fabricated. The detection sensitivity of the optimised probe has been studied using machined notches introduced at different depths.

59 citations

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TL;DR: The tensile data involving austenitic Alloy C-276 suggest that this alloy is capable of maintaining appreciable structural strength at temperatures relevant to the sulfuric acid decomposition process related to the nuclear hydrogen initiative.
Abstract: The tensile data involving austenitic Alloy C-276 suggest that this alloy is capable of maintaining appreciable structural strength at temperatures relevant to the sulfuric acid decomposition process related to the nuclear hydrogen initiative. Reduced failure strain and formation of serrations, characteristics of dynamic strain ageing (DSA), were noted within susceptible temperature regimes. An average activation energy of 55 kJ/mol, and work hardening index ranging from 0.68 to 0.75 were determined as functions of different testing temperature and strain rates. The occurrence of DSA was also associated with enhanced dislocation density. Depending on the testing temperature, a combination of ductile and intergranular brittle failures was observed with the tested specimens.

56 citations

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TL;DR: In this article, the authors investigated the crack growth behavior of plain and fly ash concretes with different curing periods during uniaxial compression testing using acoustic emission (AE) technique.

36 citations

Journal ArticleDOI
TL;DR: A set of experiments has been carried out to examine the characteristics of the acoustic emission (AE) generated during tensile deformation of AISI type 304 stainless steels as discussed by the authors.
Abstract: A set of experiments has been carried out to examine the characteristics of the acoustic emission (AE) generated during tensile deformation of AISI type 304 stainless steels. Two grades of steels—nuclear and commercial; and two types of specimens—unnotched and notched, have been used in this study. The AE total counts obtained in different specimens for specific strain levels have been analysed by regression analysis approach of data analysis. The results indicate that the AE counts from notched specimens are usually higher than those from unnotched specimens in the nuclear grade steel, unlike the opposite results obtained for the commercial grade steel in the present study and also reported results for other materials. These results have been explained with the help of the different sources of AE in the two grades of stainless steels.

32 citations


Cited by
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Journal ArticleDOI
Abstract: This article presents an overview of the developments in stainless steels made since the 1990s. Some of the new applications that involve the use of stainless steel are also introduced. A brief introduction to the various classes of stainless steels, their precipitate phases and the status quo of their production around the globe is given first. The advances in a variety of subject areas that have been made recently will then be presented. These recent advances include (1) new findings on the various precipitate phases (the new J phase, new orientation relationships, new phase diagram for the Fe–Cr system, etc.); (2) new suggestions for the prevention/mitigation of the different problems and new methods for their detection/measurement and (3) new techniques for surface/bulk property enhancement (such as laser shot peening, grain boundary engineering and grain refinement). Recent developments in topics like phase prediction, stacking fault energy, superplasticity, metadynamic recrystallisation and the calculation of mechanical properties are introduced, too. In the end of this article, several new applications that involve the use of stainless steels are presented. Some of these are the use of austenitic stainless steels for signature authentication (magnetic recording), the utilisation of the cryogenic magnetic transition of the sigma phase for hot spot detection (the Sigmaplugs), the new Pt-enhanced radiopaque stainless steel (PERSS) coronary stents and stainless steel stents that may be used for magnetic drug targeting. Besides recent developments in conventional stainless steels, those in the high-nitrogen, low-Ni (or Ni-free) varieties are also introduced. These recent developments include new methods for attaining very high nitrogen contents, new guidelines for alloy design, the merits/demerits associated with high nitrogen contents, etc.

1,668 citations

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TL;DR: This review focuses on the advances of IRT as a non-contact and non-invasive condition monitoring tool for machineries, equipment and processes.

697 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of initial pH and temperature of iron salt solutions on formation of magnetite (Fe3O4) nanoparticles during co-precipitation was reported.

287 citations

Journal ArticleDOI
TL;DR: In this article, a comprehensive review of the acoustic emission (AE) technique for its applications in concrete structure health monitoring is presented, with highlights on the limitation of the individual parameter-based approaches when adopted on site.

278 citations

Journal ArticleDOI
Yan Shi1, Chao Zhang1, Rui Li1, Rui Li2, Maolin Cai1, Guanwei Jia1 
10 Dec 2015-Sensors
TL;DR: The main principles, measurement and processing of MFL data, the identification of the leakage magnetic signal is discussed, and future developments in pipeline MFL detection are predicted.
Abstract: Magnetic flux leakage (MFL) detection is one of the most popular methods of pipeline inspection. It is a nondestructive testing technique which uses magnetic sensitive sensors to detect the magnetic leakage field of defects on both the internal and external surfaces of pipelines. This paper introduces the main principles, measurement and processing of MFL data. As the key point of a quantitative analysis of MFL detection, the identification of the leakage magnetic signal is also discussed. In addition, the advantages and disadvantages of different identification methods are analyzed. Then the paper briefly introduces the expert systems used. At the end of this paper, future developments in pipeline MFL detection are predicted.

227 citations