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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 7, Issue 1 - Oct 1987
Volume 6, Issue 2 - Apr 1987
Selecting the target year
Study on Leak Detection of the Pipeline System by Acoustic Emission
Yoon, D.J. ; Kim, C.J. ;
Journal of the Korean Society for Nondestructive Testing, volume 7, issue 1, 1987, Pages 7~17
Leak detection testing for the pipeline system was performed by the acoustic emission method. It was found that the detected signal spectrum was influenced by the frequency response of sensors and pressure changes. AE parameters and frequency spectrum distributions were used to analyze the leak signals. The slope rise time of AE parameters were the important factors for distinguishing leak signals. The amplitude of leak signal was more affected by the changes of leak, rate and pressure than those of leak type.
Research for Ultrasonic Transducer Manufacturing and Evaluation Technique
Yoon, K.S. ; Huh, H. ; Park, D.Y. ;
Journal of the Korean Society for Nondestructive Testing, volume 7, issue 1, 1987, Pages 18~31
For the purpose of domestic production of ultrasonic transducer, experiments on material selection for backing and matching layer, and electrical impedance matching between transducer and equipment were performed. The characteristics of manufactured transducers with experimental results were analyzed and compared with foreign products. Through the evaluation of the transducers manufactured and the comparision with foreign products, it is confirmed that the transducers manufactured show the good performance characteristics and efficiency.
The Correlation between the Ultrasonic Backscattered Energy and the Applied Stress in Al material
Park, J.H. ; Park, C.S. ; Lim, H.T. ;
Journal of the Korean Society for Nondestructive Testing, volume 7, issue 1, 1987, Pages 32~41
As a new device of stress monitoring method, ultrasonic backscattering method has been used to aluminium samples with various grain sizes at rayleigh critical angle in order to observe the relationships between applied stress and ultrasonic backscattered energy. It was found that the ultrasonic backscattered energy was observed to decrease as the grain size increased at the given applied stress. At the same grain size, the ule ultrasonic backscattered energy increased with increasing the applies stress. Through this study, we provided some possibility to evaluate stresses in materials under loads nondestructively, and this method is expected to be used as a new stress monitoring device.
A Size Evaluation for Continuous Flaw Monitoring Using the Tip Diffraction Method
Jung, H.K. ; Cho, C.K. ; Kim, B.C. ;
Journal of the Korean Society for Nondestructive Testing, volume 7, issue 1, 1987, Pages 42~50
Most of significant defects in the pressure boundaries of nuclear power plant we re dispositioned to be monitored periodically every inservice inspection. Due to the difficulty of the defect sizing during operation, it is necessary to develope the continuous flaw monitoring techniques. The Tip Diffraction method, specifically speaking, spot seems to be suitable for flaw monitoring. The optimum conditions of selecting the transducer were 3.5 MHz and 45-57 degree according to compatibility with the defect height. The effective calculation of the defect height was to assume the fact that the incident beam is parallel. This method would be supplemented to ASME method about the defect characterization for the surface flaw.
The Review of NDT Subcontract Technical Service for ASME Code Stamp
Lee, Y. ;
Journal of the Korean Society for Nondestructive Testing, volume 7, issue 1, 1987, Pages 51~53