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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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 9, Issue 2 - Nov 1989
Volume 9, Issue 1 - May 1989
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Determination of Two- Dimensional Distribution of Fission Products in the Irradiated Fuel Rod by Image Reconstruction Methods
Park, K.J. ; Ro, S.G. ;
Journal of the Korean Society for Nondestructive Testing, volume 9, issue 2, 1989, Pages 8~17
Reconstruction of the radial two-dimensional of fission products using projections obtained by nondestructive transversal direction gamma scanning was evaluated, and then compared with the destructive sectional gamma scanning results. Although the nondestructive method has a little drawback compared to the destructive method in the accuracy, the former seemed to be sufficiently applicable.
Evaluation of Mechanical Properties of Structural Ceramics (
) Using the High Frequency Ultrasonic C - Scan
Chang, Y.K. ;
Journal of the Korean Society for Nondestructive Testing, volume 9, issue 2, 1989, Pages 18~24
Computer-aided high frequency ultrasonic is applied to aluminum oxide(85w%, 94w%, 96w%, and 99w%) MOR(modulus of rupture) samples to evaluate mechanical properties such as density variation, pore content, elastic modulus, shear modulus, and poisson's ratio. Ultrasonic wave velocity and attenuation measurement techniques were used as an evaluator of such properties. Pulse-echo C-Scan images with different fate setting method using 50MHz center frequency 1 inch focal length transducer allows evaluation of density variation and pore content. Elastic modulus calculated with the relation of density and ultrasonic velocity. It shows good reliability as compared with resonance method. Sintered density variation of
, that is 0.6% of theoretical density in
samples can be observed by ultrasonic velocity measurement. Attenuation measurement method qualitatively agree with 4-point fracture testing result concerning of porosity content.
Ultrasonic Nondestructive Evaluation(NDE) of Cornposite Materials - A Review -
Lee, Ouk-Sub ;
Journal of the Korean Society for Nondestructive Testing, volume 9, issue 2, 1989, Pages 25~36
This essay is a general review of the application of ultrasonic NDE techniques to the performance assessment and characterization of composite materials. A brief review of ultrasonic input-output characterization of a composite plate by shear waves is presented. A theoretical development of ultrasonic wave propagation in isotropic and anisotropic media excited, respectively, by a circular transducer and an oscillatory point source is summarized. Some experimental results are described in which ultrasonic velocity and attenuation measurements give insight into material degradation of fatigued composite laminates. Ultrasonic determination of the elastic constants of a composite plate and an experimental attempt at ultrasonic testing of an isotropic plate containing a crack are also included. A recent effort for the characterization of viscoelastic materials using the ultrasonic NDE technique is outlined. Finally, the reliability of ultrasonic NDE is briefly touched upon.
Wobble and Nonconcentricity Effects in Eddy Current Test of Tubes or Rods
Kim, Y.J. ; Kim, Y.G. ;
Journal of the Korean Society for Nondestructive Testing, volume 9, issue 2, 1989, Pages 37~41
The purpose of this paper is to estimate the effect of wobble and nonconcentricity of tubes or rods in eddy current test with encircling test coils. Because the eddy current induced in a sample is related to the total magnetic flux linkages, the information about magnetic field distribution in a coil is important. In theoretical study, magnetic field distribution in a single turn coil was calculated and variation of impedance according to the difference of sample positions was presumed. Magnetic field intensity at inside of a solenoidal coil was measured and compared with the theoretical estimation. In experiment, impedance loci of a coil encircling an aluminum rod were measured at different sample positions. The effect of crack positions was examined at same sample positons.
A Study of the Detection for Underclad Cracks of Nuclear Pressure Vessel
Park, C.S. ; Ahn, H.S. ; Park, J.H. ; Park, K.H. ;
Journal of the Korean Society for Nondestructive Testing, volume 9, issue 2, 1989, Pages 42~49
It has not been performed to inspect the underclad cracking in Korea nuclear plant since there is no Code Requirements for inspection. However, underclad cracks in nuclear pressure vessels were reported firstly in 1970. The objection of this study is to be established the ultrasonic inspection techniques for underclad cracking. The ultrasonic inspection of bimetalic stainless steel weld is very difficult by high attenuation and multiple scattering at weld surface and weld/base metal interface. The various inspection methods using
refracted longitudinal wave, 50/70 tandem transducer,
single shear wave are compared. Experiments on limited specimens applied same condition to nuclear pressure vessels shows that
refracted longitudinal wave method is the best one for the detection of underclad cracks. 50/70 tandem transducer using SPOT(Satellite Pulse Observation Technique) is more effective for underclad crack sizing than other sizing methods.
A Study on the Development and Characteristics of Strain Gauge using Sputter Machining
Han, E.K. ; Rho, B.O. ; Lee, M.H. ;
Journal of the Korean Society for Nondestructive Testing, volume 9, issue 2, 1989, Pages 50~60
The control of resistance of foil strain gauge is accomplished by means of etching technique. Thus, there is an irregularity in metal foil. In order to solve this problem, ion sputter machining method has been used to make strain gauge in this study and the characteristics of this strain gauge are investigated. As the result of this study, it was possible to make a flexible strain gauge which can be used to measure the stress. The strain gauge made by authors shows superior characteristics in creep, O point variance, hysteresis and nonlinearity by surrounding temperature.
Welding Residual Stress Measurement by Ultrasonic Method
Lee, S.S. ; Ahn, B.Y. ;
Journal of the Korean Society for Nondestructive Testing, volume 9, issue 2, 1989, Pages 61~66
Welding residual stress was measured by ultrasonic birefringence technique. Acoustoelastic constant was taken by averaging the values in the literature. The initial birefringence from prefered orientation of grains was measured. The EMAT transducers were used to remove couplant effect. The results show that the distribution and magnitude of welding residual stress from ultrasonic measurement are in good agreements with those from semi destructive hole drilling measurement.
PSI/ISI Data Management System by using Personal Computer in Nuclear Power Plant
Song, S.J. ; Sim, C.M. ;
Journal of the Korean Society for Nondestructive Testing, volume 9, issue 2, 1989, Pages 67~72
In nuclear power plants, nondestructive examinations(NDE) plays an important role in ensuring the integrity and reliability operation. As the number of plants and operational time increased, manual handling of voluminous data associated with PSI/ISI(preservice/inservice inspection) could result in many errors or mistakes in writing the examination plan or other reports. Several new approaches to process the data have been attempted and DBMS(Data Base Management System) has been well known concept with a faster and more accurate data processing. This paper proposes an application program, called NDTSYS designed with DBMS in micro computer. The program could be used for a tool to add new records to a data base, change existing records, delete records and request reports with the data base. It would be helpful to the user who manage the PSI/ISI data with minimal time and effort.