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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 34, Issue 6 - Dec 2014
Volume 34, Issue 5 - Oct 2014
Volume 34, Issue 4 - Aug 2014
Volume 34, Issue 3 - Jun 2014
Volume 34, Issue 2 - Apr 2014
Volume 34, Issue 1 - Feb 2014
Selecting the target year
Measurement of Inner Defects and out of Plane Deformation of Pressure Vessel in Piping of Circulation System Using Shearography
Kang, Chan-Geun ; Kim, Hyun-Ho ; Jung, Hyun-Il ; Choi, Tae-Ho ; Jung, Hyun-Chul ; Kim, Kyeong-Suk ;
Journal of the Korean Society for Nondestructive Testing, volume 34, issue 5, 2014, Pages 349~355
DOI : 10.7779/JKSNT.2014.34.5.349
Wall thinning defects can occur in the pressure vessels used in a variety of industries. Such defects are related to the flow velocity. Considering the fact that such vessels constitute up to 70 or 80% of the plant structures in a power plant, it is important to measure internal defects as part of a safety evaluation. In this study, optical measurement were applied in a non-destructive evaluation using shearography to ensure the safety and improve the reliability of a power plant through the non-contact, non-destructive evaluation of pressure vessels. In order to verify whether the pressure vessels contained faults, experimental and analytical investigation were conducted to measure any internal defects and out-of-plane deformation from inner temperature changes and pressure changes in the piping of the circulation system. The most important factors in this research were the thickness, width, and length of a defect. An increase in these could confirm an increase in the deformation. Thus, internal defects in a pressure vessel were measured using shearography, which made it possible to ensure the reliability and integrity of the pipe.
An Effect on the Structural Integrity Assessment of Steam Generator Tubes with Resolution of Rotating Pancake Coils for Multiple Cracks
Kang, Yong-Seok ; Cheon, Keun-Young ; Nam, Min-Woo ; Park, Jai-Hak ;
Journal of the Korean Society for Nondestructive Testing, volume 34, issue 5, 2014, Pages 356~361
DOI : 10.7779/JKSNT.2014.34.5.356
The eddy current testing performance directly affects the results of a steam generator tube integrity assessment because the integrity assessment of defected tubes is conducted based on eddy current testing results. This means that it may not be possible to accurately discriminate between adjacent flaws. This paper presents an investigation on the resolution of rotating pancake coils with multiple cracks and the effects on the structural integrity assessment of steam generator tubes.
Muscular Condition Monitoring System Using Fiber Bragg Grating Sensors
Kim, Heon-Young ; Lee, Jin-Hyuk ; Kim, Dae-Hyun ;
Journal of the Korean Society for Nondestructive Testing, volume 34, issue 5, 2014, Pages 362~368
DOI : 10.7779/JKSNT.2014.34.5.362
Fiber optic sensors (FOS) have advantages such as electromagnetic interference (EMI) immunity, corrosion resistance and multiplexing capability. For these reasons, they are widely used in various condition monitoring systems (CMS). This study investigated a muscular condition monitoring system using fiber optic sensors (FOS). Generally, sensors for monitoring the condition of the human body are based on electro-magnetic devices. However, such an electrical system has several weaknesses, including the potential for electro-magnetic interference and distortion. Fiber Bragg grating (FBG) sensors overcome these weaknesses, along with simplifying the devices and increasing user convenience. To measure the level of muscle contraction and relaxation, which indicates the musle condition, a belt-shaped FBG sensor module that makes it possible to monitor the movement of muscles in the radial and circumferential directions was fabricated in this study. In addition, a uniaxial tensile test was carried out in order to evaluate the applicability of this FBG sensor module. Based on the experimental results, a relationship was observed between the tensile stress and Bragg wavelength of the FBG sensors, which revealed the possibility of fabricating a muscular condition monitoring system based on FBG sensors.
Impact and Damage Detection Method Utilizing L-Shaped Piezoelectric Sensor Array
Jung, Hwee-Kwon ; Lee, Myung-Jun ; Park, Gyuhae ;
Journal of the Korean Society for Nondestructive Testing, volume 34, issue 5, 2014, Pages 369~376
DOI : 10.7779/JKSNT.2014.34.5.369
This paper presents a method that integrates passive and active-sensing techniques for the structural health monitoring of plate-like structures. Three piezoelectric transducers are deployed in a L-shape to detect and locate an impact event by measuring and processing the acoustic emission data. The same sensor arrays are used to estimate the subsequent structural damage using guided waves. Because this method does not require a prior knowledge of the structural parameters, such as the wave velocity profile in various directions, accurate results could be achieved even on anisotropic or curved plates. A series of experiments was performed on plates, including a spar-wing structure, to demonstrate the capability of the proposed method. The performance was also compared to that of traditional approaches and the superior capability of the proposed method was experimentally demonstrated.
Evaluation of Contact Resistance between Carbon Fiber/Epoxy Composite Laminate and Printed Silver Electrode for Damage Monitoring
Jeon, Eun-Beom ; Takahashi, Kosuke ; Kim, Hak-Sung ;
Journal of the Korean Society for Nondestructive Testing, volume 34, issue 5, 2014, Pages 377~383
DOI : 10.7779/JKSNT.2014.34.5.377
An addressable conducting network (ACN) makes it possible to monitor the condition of a structure using the electrical resistance between electrodes on the surface of a carbon fiber reinforced plastics (CFRP) structure. To improve the damage detection reliability of the ACN, the contact resistances between the electrodes and CFRP laminates needs to be minimized. In this study, silver nanoparticle electrodes were fabricated via printed electronics techniques on a CFRP composite. The contact resistance between the silver electrodes and CFRP were measured with respect to various fabrication conditions such as the sintering temperature of the silver nano-ink and the surface roughness of the CFRP laminates. The interfaces between the silver electrode and carbon fibers were observed using a scanning electron microscope (SEM). Based on this study, it was found that the lowest contact resistance of
could be achieved when the sintering temperature of the silver nano-ink and surface roughness were
and 0.230 a, respectively.
Study on Performance Demonstration Test Result of Ultrasonic Examination in Nuclear Power Plant
Jung, Nam-Du ; Moon, Yong-Sig ; Lee, Seung-Pyo ;
Journal of the Korean Society for Nondestructive Testing, volume 34, issue 5, 2014, Pages 384~389
DOI : 10.7779/JKSNT.2014.34.5.384
In this paper, the result of an ultrasonic performance demonstration are analyzed. The requirements for an ultrasonic performance demonstration (PD) for a nuclear power plant were first described in ASME B&P Code Section XI, Appendix VIII (1989 winter addenda). In order to establish the performance demonstration scheme in Korean nuclear power plants, the Korea Hydro & Nuclear Power Co. Ltd (KHNP) has developed the Korean Performance Demonstration (KPD) system for the for the ultrasonic examination of nuclear power plants. An analysis of the ultrasonic performance demonstration results from 2004 through 2013 will improve the detection of flaws in an ultrasonic examination, as well as the further development of the KPD training system.
Study on Smart Seat Technology for Railroad Vehicles Using Piezoelectric Sensors
Kang, Donghoon ; Kim, Heon-Young ; Kim, Dae-Hyun ;
Journal of the Korean Society for Nondestructive Testing, volume 34, issue 5, 2014, Pages 390~396
DOI : 10.7779/JKSNT.2014.34.5.390
A study on smart seats for railroad vehicles was conducted using piezoelectric (PZT) sensors. For this purpose, the concept of passenger friendly smart seats was defined, and a PZT sensor was selected as the optimum sensor based on this concept. Using PZT sensors, simulation tests were performed using a sub-scale model railroad vehicle. In these tests, the main functions of the smart seats were extracted and simplified to improve the effectiveness of the simulation tests. Based on the test results, the system for smart seats proposed in this paper was successfully verified using PZT sensors and the dedicated operation software for the system. This paper will contribute to the improvement of services in high-speed rail systems through advances in ticket checking tasks.