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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 12, Issue 3 - Dec 1992
Volume 12, Issue 2 - Aug 1992
Volume 12, Issue 1 - Mar 1992
Selecting the target year
Characteristics of Point-Focus Type Ultrasonic Transducer using PVDF Element
Han, E.K. ; Hwang, S.T. ; Lee, B.S. ; Park, J.S. ; Ogura, Y. ;
Journal of the Korean Society for Nondestructive Testing, volume 12, issue 2, 1992, Pages 7~13
In this study, we examine the characteristics of beam and the effect of these characteristics on the flaw detection by using different type of two transducers, which are PZT and PVDF film transducer. Consequently, the detection of infinitesimal flaw is more possible than PZT, since it has beam width at focus of
in contrast with PZT's. Moreover we can know PVDF transducer has superiority in detecting ability for sub-surface flaw detection in view of its acoustic impedance is near to water's and its focusing range is narrower than PZT's as
because it has spherical surface.
Careful Determination of Inservice Inspection of piping by Computer Analysis in Nuclear Power Plant
Lim, H.T. ; Lee, S.L. ; Lee, J.P. ; Kim, B.C. ;
Journal of the Korean Society for Nondestructive Testing, volume 12, issue 2, 1992, Pages 14~20
Stress analysis has been performed using computer program ANSYS in the pressurizer surge line in accordance with ASME Sec. III in order to predict possibility of fatigue failure due to thermal stratification phenomena in pipes connected to reactor coolant system of nuclear power plants. Highly vulnerable area to crack generation has been chosen by the analysis of fatigue due to thermal stress in pressurizer surge line. This kind of result can be helpful to choose the location requiring intensive care during inservice inspection of nuclear power plants.
Acceleration Signal Characteristics of Steel Plate Impacted by Metallic Loose Parts
Sung, K.Y. ; Yoon, Y.K. ;
Journal of the Korean Society for Nondestructive Testing, volume 12, issue 2, 1992, Pages 21~29
Acceleration signal characteristics of a steel plate, impacted by steel balls, were studied in an attempt to apply the experimental results to the impact location and mass estimation of metallic loose parts in the cooling system of nuclear power plants. Experimental results show that the variation of maximum acceleration amplitude and impact contact time due to the change of ball mass and impact velocity can be well explained by the Hertz impact theory. The frequency spectral pattern shifted slightly in spite of the increase of impact velocity and impact location. Ball mass, however, strongly affected the frequency spectral pattern. Hence the frequency spectrum can be used for estimation of the mass of unknown loose parts in the cooling system.
The Improvement of Storage Method for Spare Part of Turbine Bearing in Power Plants
Lee, Sung-Ho ;
Journal of the Korean Society for Nondestructive Testing, volume 12, issue 2, 1992, Pages 30~35
High quality of turbine babbit bearing has to be maintained for smooth operation of power plants. So in the research center of the Korea Electric Power Company, Ultrasonic testing has been peformed on the spare part of babbit bearing during past ten years. Since separation between babbit bearing and base metal was seen for most of the bearings in stock, investigation has begun in order to see the effect on temperature and humidity variation of the separation, and thus searching for the optimum storage method.