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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Nondestructive Testing
Journal Basic Information
Journal DOI :
The Korean Society for Nondestructive Testing
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Volume & Issues
Volume 26, Issue 6 - Dec 2006
Volume 26, Issue 5 - Oct 2006
Volume 26, Issue 4 - Aug 2006
Volume 26, Issue 3 - Jun 2006
Volume 26, Issue 2 - Apr 2006
Volume 26, Issue 1 - Feb 2006
Selecting the target year
RTD Analysis using Radioisotope Tracer on the Water Flow Characteristics in a Flocculator of Wastewater Treatment Facility
Kim, Jin-Seop ; Jung, Sung-Hee ; Kim, Jong-Bum ;
Journal of the Korean Society for Nondestructive Testing, volume 26, issue 1, 2006, Pages 1~6
Using In-113m emitting gamma ray of 0.392MeV at radioisotope tracer the RTD (residence time distribution) of water in the flocculator of wastewater treatment facility was measured. The result was analyzed mathematically using K-RTD program constructed on the basis of CFSTR (constant flow stirred tank reactor) model. The mean residence time and the tank number are the main parameters which describe the flow behavior of the system. Those parameters were obtained in the fitting profess of the simulated curves to the experimental results. It was suggested to construct a modified numerical model to describe the bypass flow which was observed in the experiment.
Characterization of TiN Layered Substrate using Leaky Rayleigh Surface Wave
Kwon, Sung-Duk ; Kim, Hak-Joon ; Song, Sung-Jin ;
Journal of the Korean Society for Nondestructive Testing, volume 26, issue 1, 2006, Pages 7~11
Since ceramic layers coated on machinery components inevitably experience the changes in their properties it is necessary to evaluate the characteristics of ceramic coating layers nondestructively for a reliable use of coated components and 4heir remaining life prediction. To address such a need, in the present study, an ultrasonic backward radiation technique is applied to investigate the characteristics of leaky Rayleigh surface waves propagating through the very thin TiN ceramic layers coated on AISI 1045 steel or austenitic 304 steel substrate with three different conditions of surface roughness, coating layer thickness and wear condition. In the experiments performed in the present work, the peak angle and the peak amplitude of ultrasonic backward radiation profile varied sensitively according to three specimen preparation renditions. in fact, this result demonstrates a high possibility of the ultrasonic backward radiation as an effective tool for the nondestructive characterization of the resting layers even in such a thin regime.
A Study on Quantitative Flaw Evaluation of Nuclear Power Plant Steam Generator Tube by Ultrasonic Testing
Yoon, Byung-Sik ; Kim, Yong-Sik ; Lee, Hee-Jong ; Lee, Yong-Ho ;
Journal of the Korean Society for Nondestructive Testing, volume 26, issue 1, 2006, Pages 12~17
A steam generator of nuclear power plant has thousands of thin tubes. These tubes play an important role in maintaining the pressure boundary between the primary and secondary side of nuclear power plant. The steam generator tube is easy to be damaged because of the severe operating conditions such as the high temperature and pressure. Therefore, tremendous efforts are made to assess the structural integrity of the steam generator tubes. The eddy current test is the most popular non-destructive test to assess the integrity of the tubes. However, the eddy current test has the limitation to size the flaw accurately because the eddy current signal behavior depends on the total volume of flaw. This paper shows the possibility that the ultrasonic test method can be applied to detect the flaws in the steam generator tubes and to measure them quantitatively. From the test results, it is expected that if the ultrasonic test is put to practical use in the steam generator tube inspection, the inspection results will be improved.
Development of Ultrasonic Waveguide Sensor for Under=Sodium Viewing in Liquid Metal Reactor
Joo, Young-Sang ; Lee, Jae-Han ;
Journal of the Korean Society for Nondestructive Testing, volume 26, issue 1, 2006, Pages 18~24
Reactor core and internal structures of a liquid metal reactor (LMR) can not be visually examined due to an opaque liquid sodium. The under-sodium viewing technique by using an ultrasonic wave should be applied far the visual inspection of reactor internals. In this study, an ultrasonic waveguide sensor with a strip plate has been developed for an application to the under-sodium viewing technique. The Lamb wave propagation of a waveguide sensor has been analyzed and the zero-order antisymmetric
plate wave was selected as the application mode of the sensor. The
plate wave can be propagated in the dispersive low frequency range by using a liquid wedge clamped to the waveguide. A new technique is presented which is capable of steering the radiation beam angle of a waveguide sensor without a mechanical movement of the sensor assembly The steering function of the ultrasonic radiation beam can be achieved by a frequency tuning method of the excitation pulse in the dispersive range of the
mode. The technique provides an opportunity to overcome the scanning limitation of a waveguide sensor. The beam steering function has been evaluated by an experimental verification. The ultrasonic C-scanning experiments are performed in water and the feasibility of the ultrasonic waveguide sensor has been verified.
Eddy Current Signal Analysis for Transmit-Receive Pancake Coil on ECT Array Probe
Lee, Hyang-Beom ;
Journal of the Korean Society for Nondestructive Testing, volume 26, issue 1, 2006, Pages 25~29
In this paper, the eddy current signals come from a pair oi transmit-receive (T/R) pancake coil on ECT array Probe are analyzed with the variations of the lift-of and of the distance between transmit and receive coils. To obtain the electromagnetic characteristics of the probes, the governing equation describing the eddy current problems is derived from Maxwell's equation and is solved using three-dimensional finite element method. Eddy current signals from T/R coils on ECT array probe have quite different characteristics compared with ones from impedance coil on rotating pancake coil probe. The results in this paper ran be helpful when the field eddy current signals from ECT array probe are evaluated.
Use of the Mass-Spying Lattice Model for Simulation of Ultrasonic Waves in Austenitic Welds
Baek, Eun-Sol ; Yim, Hyun-June ;
Journal of the Korean Society for Nondestructive Testing, volume 26, issue 1, 2006, Pages 30~39
Feasibility is studied for an application of the mass-spring lattice model (MSLM), a numerical model previously developed for unidirectional composites, to the numerical simulation of ultrasonic inspection of austenitic welds modeled as transversely isotropic. Fundamental wave processes, such as propagation, reflection, refraction, and diffraction of ultrasonic waves in such an inspection are simulated using the MSLM. All numerical results show excellent agreement with the analytical results. Further, a simplified model of austenitic weld inspection has been successfully simulated using the MSLM. In conclusion, a great potential of the MSLM in numerically simulating ultrasonic inspections of austenitic welds has been manifested in this work, though significant further efforts will be required to develop a model with field practicality.