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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 13, Issue 3 - Nov 1993
Volume 13, Issue 2 - Sep 1993
Volume 13, Issue 1 - May 1993
Volume 12, Issue 4 - Feb 1993
Selecting the target year
Development and Characterization of High-Performance Acoustic Emission Sensors
Kim, B.G. ; Kim, Y.H. ;
Journal of the Korean Society for Nondestructive Testing, volume 12, issue 4, 1993, Pages 9~17
Three types of piezoelectric sensors to detect acoustic emission signals were developed and characterized. Epicentral displacement and velocity of a plate to have infinite boundary were calculated by convolution between a Green's function and a simulated source time function to show parabolic rising characteristic. The sensor calibration system set up was composed of a steel plate, a glass capillary, an indentor and a load cell indicator The transient elastic signals were detected by the sensors. The results were compared with the theoretical results and Fast Fourier Transformed. As the results, the sensor fabricated using a disk shape of a piezoelectric PZT element showed resonant characteristics. The sensors fabricated using a conical shape PZT element and a PVDF polymer film showed the wide band characteristics for particle displacement and velocity, respectively. The calculated results showed good agreements with the transient responses in the cases of the wide band sensors and it was confirmed that the simulated source time function had been properly assumed.
A Study on the Application Method of Various Digital Image Processing in the IC Package
Kim, Jae-Yeol ;
Journal of the Korean Society for Nondestructive Testing, volume 12, issue 4, 1993, Pages 18~25
This paper is to aim the microdefect evaluation of If package into a quantitative from NDI's image processing of ultrasonic wave. (1) Automatically repeated discrimination analysis method can be devided in the category of all kind of defects on IC package, and also can be possible to have a sampling of partial delamination. (2) It is possible that the information of edge section in silicon chip surrounding can be extractor by the partial image processing of IC package. Also, the crack detection is possible between the resin part and lead frame.
A Study on the Advance of Measuring Accuracy of High Tension Bolt Axial Force Using Ultrasonic Acoustoelasticity Effects
Kim, H.S. ; Oh, H.G. ;
Journal of the Korean Society for Nondestructive Testing, volume 12, issue 4, 1993, Pages 26~31
In this paper, the axial force of high tension bolt is measured by using ultrasonic wave. In the case of the different materials the conclusion obtained are as follows : (1) The relation of the material quality of each high tension bolt and form(diameter or section area), and yield axial force can be observed. (2) As 0.1 is devided by the apparent elongation the measurement accuracy of high tension bolt can be achived. Also, it is founded that the Joint axial force of high tension bolt is determined by the yield force.
Status and Prospects of Nondestructive Testing and Evaluation in the Republic of Korea
Lee, Hae ; Kwon, Oh-Yang ;
Journal of the Korean Society for Nondestructive Testing, volume 12, issue 4, 1993, Pages 32~39
Past, present and future of nondestructive testing and evaluation(NDT&E) activities in Korea are reviewed. The current status and future direction in NDT&E research and development are presented. The newly revised edition of Korean NDT personnel qualification system is described. Other activities such as NDT&E training programs, NDT field services, and professional societies and international cooperation are also summarized. Founded in 1980, the Korean Society for Nondestructive Testing is now the center of domestic activities in NDT&E as well as the gateway to the international cooperation.