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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
Editor in Chief :
Volume & Issues
Volume 20, Issue 6 - Dec 2000
Volume 20, Issue 5 - Oct 2000
Volume 20, Issue 4 - Aug 2000
Volume 20, Issue 3 - Jun 2000
Volume 20, Issue 2 - Apr 2000
Volume 20, Issue 1 - Feb 2000
Selecting the target year
Study of the Nondestructive Test Method for the Embrittlement Evaluation of Nuclear Reactor Vessel Material by
Jung, M.M. ; Jang, K.S. ; Yoo, K.B. ; Kim, G.M. ; Yoon, I.S ; Hong, C.Y. ;
Journal of the Korean Society for Nondestructive Testing, volume 20, issue 3, 2000, Pages 183~190
The purpose of this study is to evaluate the magnetic property change of the nuclear reactor vessel steel irradiated by fast neutrons using
spectroscopy, and the effects of the defects produced by neutron irradiation on the changes using X-ray diffraction. The specimens, fabricated with the dimension of
, were irradiated by neutron fluence from
at 343K. Throughout the experiments, it is understood that (1) the X-ray diffraction measurement shows that the change of crystal nature is started at the irradiation of
and a crystal structure has been severely damaged at the irradiation over
, (2) the analysis of the
spectra has shown that magnetic transition phenomena occur at the irradiation over
and (3) both methods can be utilized as nondestructive test methods for the embrittlement evaluation of materials irradiated by fast neutrons.
Finite Element Analysis of Eddy Current Testing for Tubes with 3-Dimensional Defects
Lee, Hyang-Beom ; Won, Sung-Yean ; Shin, Young-Kil ;
Journal of the Korean Society for Nondestructive Testing, volume 20, issue 3, 2000, Pages 191~199
In this paper, a numerical analysis using the finite element method (FEM) is presented which models the eddy current testing (ECT) of tubes with 3-dimensional defects. For the description of 3-dimensional eddy current problems, the governing equation is derived from the Maxwell's equations. The 3-dimensional FEM formulation with hexahedral elements is carried out using the Galerkin weighted residual method. The INCONEL 600 steam generator tube with inner and outer diameter defects is adopted for the numerical analysis, and the ECT signal, which is the trajectory of the probe impedance, is calculated. For the verification of the numerical analysis method, results of numerical calculations and experiments are compared and they show good agreements. Based on this verification, several defect signals are predicted and their characteristics are investigated with the variation in the defect depth and the circumferential angle of the defect.
Development of Intelligent Database Program for PSI/ISI Data Management of Nuclear Power Plant (Part II)
Park, Un-Su ; Park, Ik-Keun ; Um, Byong-Guk ; Lee, Jong-Po ; Han, Chi-Hyun ;
Journal of the Korean Society for Nondestructive Testing, volume 20, issue 3, 2000, Pages 200~205
In a previous paper, we have discussed the intelligent Windows 95-based data management program(IDPIN) which was developed for effective and efficient management of large amounts of pre-/in-service inspection(PSI/ISI) data of Kori nuclear power plants. The IDPIN program enables the prompt extraction of previously conducted PSI/ISI conditions and results so that the time-consuming data management, painstaking data processing and analysis of the past are avoided. In this study, the intelligent Windows based data management program(WS-IDPIN) has been developed as an effective data management of PSI/ISI data for the Wolsong nuclear power plants. The WS-IDPIN program includes the modules of comprehensive management and analysis of PSI/ISI results, statistical reliability assessment program of PSI/ISI results(depth and length sizing performance etc), standardization of UT report form and computerization of UT results. In addition, the program can be further developed as a unique PSI/ISI data management expert system which can be part of the PSI/ISI total support system for Korean nuclear power plants.
A Study on the Guided Wave Mode Conversion using Self-calibrating Technique
Park, Jung-Chul ; Cho, Youn-Ho ;
Journal of the Korean Society for Nondestructive Testing, volume 20, issue 3, 2000, Pages 206~212
The guided wave mode conversion phenomena were investigated for the NDE of a plate-like structure with thickness variation. The ratios of reflection and transmission (R/T) were measured via the self-calibrating procedure which allows us to obtain experimental guided wave data in a more reliable way regardless of the coupling uncertainty between transducer & specimen. The results on R/T could be used to determine the thickness reduction of the structure. It was shown that not only the incident modes but also the converted ones need to be considered in the self-calibrating guided wave inspection to extract a reasonable correlation between experimental data & the thickness variation. Through this study, the potential of guided wave inspection as a quantitative NDE technique was explored based on the combined concept of self-calibration & multi-mode conversion in guided wave scattering problems.
Stress Analysis of an Edge-Cracked Plate by using Photoelastic Fringe Phase Shifting Method
Baek, Tae-Hyun ; Kim, Myung-Soo ; Cho, Sung-Ho ;
Journal of the Korean Society for Nondestructive Testing, volume 20, issue 3, 2000, Pages 213~220
The method of photoelasticity allows one to obtain principal stress differences and principal stress directions in a photoelastic model. In the classical approach, the photoelastic parameters are measured manually point by point. The previous methods require much time and skill in the identification and measurement of photoelastic data. Fringe phase shifting method has been recently developed and widely used to measure and analyze fringe data in photo-mechanics. This paper presents the test results of photoelastic fringe phase shifting technique for the stress analysis of a circular disk under compression and an edge-cracked plate subjected to tensile load. The technique used here requires four phase stepped photoelastic images obtained from a circular polariscope by rotating the analyzer at
. Experimental results are compared with those or FEM. Good agreement between the results can be observed. However, some error may be included if the technique is used to general direction which is not parallel to isoclinic fringe.
Detection of Inclusions in Concrete Slab by Impact-Resonance Method
Kim, Hak-Hyun ; Yim, Hyun-June ; Lee, Kwang-Myong ; Cho, Nam-Jun ;
Journal of the Korean Society for Nondestructive Testing, volume 20, issue 3, 2000, Pages 221~230
The usefulness and limitations of the impact-resonance method, which is a nondestructive evaluation (NDE) method for concrete, are studied by both experimental and theoretical methods. For the experimental study, several concrete slab specimens with various inclusions embedded were fabricated, and tested by the impact-resonance method. Some of the inclusions have been detected and accurately located, but some have not. The reasons for the failure in the latter cases have been investigated theoretically by using finite element analyses, from which the primary factors determining the success of the method have also been identified. This study will serve to enhance the understanding of the underlying physics and to improve the usefulness of the impact-resonance method as applied to concrete NDE.
Relationship between Magnetic and Mechanical Properties of Cermet Tools
Ahn, Dong-Gil ; Lee, Jeong-Hee ;
Journal of the Korean Society for Nondestructive Testing, volume 20, issue 3, 2000, Pages 231~237
The commercial cermet cutting tools consist of multi-carbide and a binder metal of iron group, such as cobalt and nickel which are ferromagnetic. In this paper, a new approach to evaluate the mechanical properties of TiCN based cermet by magnetic properties were studied in relation to binder content and sintering conditions. The experimental cermet was prepared using commercial composition with the other binder contents by PM process. It was found that the magnetic properties of the sintered cermets remarkably depended on the microstructure and the total carbon content. The magnetic saturation was proportional to increment of coercive force. At high carbon content in sintered cermet, the magnetic saturation was increased by decreasing the concentration of solutes such as W, Mo, Ti in Co-Ni binder. As the coercive force increases, the hardness usually increases. The strength and toughness of the cermet also increased with increasing the magnetic saturation. The measurement of magnetic properties made it possible to evaluate the mechanical properties in the cermet cutting tools.
Nondestructive testing by using guided wave techniques
Shin, Hyeon-Jae ;
Journal of the Korean Society for Nondestructive Testing, volume 20, issue 3, 2000, Pages 238~245