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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Nondestructive Testing
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Journal DOI :
The Korean Society for Nondestructive Testing
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Volume & Issues
Volume 32, Issue 6 - Dec 2012
Volume 32, Issue 5 - Oct 2012
Volume 32, Issue 4 - Aug 2012
Volume 32, Issue 3 - Jun 2012
Volume 32, Issue 2 - Apr 2012
Volume 32, Issue 1 - Feb 2012
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Non-Destructive Evaluation of Material Properties of Nanoscale Thin-Films Using Ultrafast Optical Pump-Probe Methods
Kim, Yun-Young ; Krishnaswamy, Sridhar ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 2, 2012, Pages 115~121
DOI : 10.7779/JKSNT.2012.32.2.115
Exploration in microelectromechanical systems(MEMS) and nanotechnology requires evaluation techniques suitable for sub-micron length scale so that thermal and mechanical properties of novel materials can be investigated for optimal design of miro/nanostructures. The ultrafast optical pump-probe technique provides a contact-free and non-destructive way to characterize nanoscale thin-films, and its ultrahigh temporal resolution enables the study of heat-transport phenomena down to a sub-picosecond regime. This paper reviews the principle of optical pump-probe technique and introduces its application to the area of micro/nano-NDE.
Influence of Heat-Treatment on the Adhesive Strength between a Micro-Sized Bonded Component and a Silicon Substrate under Bend and Shear Loading Conditions
Ishiyama, Chiemi ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 2, 2012, Pages 122~130
DOI : 10.7779/JKSNT.2012.32.2.122
Adhesive bend and shear tests of micro-sized bonded component have been performed to clarify the relationship between effects of heat-treatment on the adhesive strength and the bonded specimen shape using Weibull analysis. Multiple micro-sized SU-8 columns with four different diameters were fabricated on a Si substrate under the same fabrication condition. Heat-treatment can improve both of the adhesive bend and shear strength. The improvement rate of the adhesive shear strength is much larger than that of the adhesive bend strength, because the residual stress, which must change by heat-treatment, should effect more strongly on the shear loading. In case of bend type test, the adhesive bend strength in the smaller diameters (50 and
) widely vary, because the critical size of the natural defect (micro-crack) should vary more widely in the smaller diameters. In contrast, in case of shear type test, the adhesive shear strengths in each diameter of the columns little vary. This suggests that the size of the natural defects may not strongly influence on the adhesive shear strength. All the result suggests that both of the adhesive bend and shear strengths should be complicatedly affected by heat-treatment and the bonded columnar diameter.
A Brief Overview of a Scale Independent Deformation Theory and Application to Diagnosis of Deformational Status of Solid-State Materials
Yoshida, Sanichiro ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 2, 2012, Pages 131~141
DOI : 10.7779/JKSNT.2012.32.2.131
A field theoretical approach to deformation and fracture of solid-state material is outlined, and its application to diagnosis of deformational status of metal specimens is discussed. Being based on a fundamental physical principle known as local symmetry, this approach is intrinsically scale independent, and capable of describing all stages of deformation on the same theoretical foundation. This capability enables us to derive criteria that can be used to diagnose transitions from the elastic to plastic regime, and the plastic to fracturing regime. For practical applications of these criteria, an optical interferometric technique known as electronic speckle-pattern interferometry is proved to be quite powerful; it is able to visualize the criteria as a whole image of the object on a real-time basis without numerical processing. It is demonstrated that this method is able to reveal loading hysteresis as well.
Evaluation of Adhesive Properties in Polymeric Thin Film by Ultrasonic Atomic Force Microscopy
Kwak, Dong-Ryul ; Park, Tae-Sung ; Park, Ik-Keun ; Miyasaka, Chiaki ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 2, 2012, Pages 142~148
DOI : 10.7779/JKSNT.2012.32.2.142
This study presents the assessment results of adhesive properties on the interface between a silicon wafer and nano-scale polymer thin film pattern through UAFM images by using the contact resonance frequency of the cantilever. For the experiment, we varied surface treatment processes for the silicon wafer and fabricated a 300nm polymer thin film pattern through lithography. Images from the optical microscope were used to compare the produced test specimens for adhesive condition and the critical load value from the nano scratch test was used to verify the adhesive condition of the nano pattern. Each test specimen resulted in a
surface image and subsurface adhesive image. Adhesive condition was evaluated by image contrast differences on the interface according to the changing amplitudes and phases of contact resonance frequency.
Residual Stress Measurement of Flat Welded Specimen by Electronic Speckle Pattern Interferometry
Chang, Ho-Seob ; Kim, Dong-Soo ; Jung, Hyun-Chul ; Kim, Kyung-Suk ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 2, 2012, Pages 149~154
DOI : 10.7779/JKSNT.2012.32.2.149
The size and distribution of welding residual stress and welding deformation in welding structures have an effect on various sorts of damage like brittle failure, fatigue failure and stress corrosion cracking. So, research for this problem is necessary continuously. In this study, non-destructive technique using laser electronic speckle pattern interferometry, plate of welding specimen according to the external load on the entire behavior of residual stress are presented measurement techniques. Once, welding specimen force tensile loading, using electronic speckle pattern interferometry is measured. welding specimen of base metal and weld zone measure strain from measured result, this using measure elastic modulus. In this study, electronic speckle pattern interferometry use weld zone and base metal parts of the strain differences using were presented in residual stress calculated value, This residual stress value were calculated by numerical calculation. Consequently, weld zone of modulus high approximately 3.7 fold beside base metal and this measured approximately 8.46 MPa.
Feasibility Study on Ultrasonic Velocity for Evaluation of Microstructure and Quality of Cast Iron
Choi, C.Y. ; Hyun, C.Y. ; Byeon, Jai-Won ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 2, 2012, Pages 155~161
DOI : 10.7779/JKSNT.2012.32.2.155
It was attempted to evaluate the microstructure and quality of various types of cast iron by ultrasonic velocity measurement. Three types of commercial gray cast iron and ductile cast iron were used for this investigation, respectively. One type of the ductile cast iron was heat-treated as a function of annealing time to produce different microstructure. Ultrasonic velocity measurement, microstructural analysis (pearlite area fraction, graphite length and nodularity), and hardness measurement were performed to find empirical correlations among these parameters. Ultrasonic velocity of ductile cast iron was markedly faster than that of gray cast iron. Ultrasonic velocity decreased with the decrease of fraction of pearlite structure. As a quality monitoring parameter of cast iron, potential of ultrasonic velocity was suggested.
Study on the Micro Crack Detection in Joints by Using Ultrasound Infrared Thermography
Park, Hee-Sang ; Choi, Man-Yong ; Park, Jeong-Hak ; Lee, Seung-Seok ; Huh, Yong-Hak ; Lee, Bo-Young ; Kim, Jae-Seong ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 2, 2012, Pages 162~169
DOI : 10.7779/JKSNT.2012.32.2.162
This study detected SCC defects of dissimilar metal welded(STS304 and SA106 Gr. b) pipes using the ultrasonic infrared thermography method and the lock-in image treatment method among infrared thermography method. The infrared excitement equipment has 250 Watt of output and 20 kHz of frequency. By using the ultrasound infrared thermography method, the internal defects of dissimilar metal weld joints of pipes used at nuclear power plants could get detected. By an actual PT test, it was observed that the cracks inside the pipe existed not as a single crack but rather as a multiple cracks within a certain area and generated a hot spot image of a broad area on the thermography image. In addition, UT technology could not easily defects detected by the width of
fine hair cracks. but, ultrasound infrared thermography technique was defect detected.
Defect Depth Measurement of Straight Pipe Specimen Using Shearography
Chang, Ho-Seob ; Kim, Kyung-Suk ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 2, 2012, Pages 170~176
DOI : 10.7779/JKSNT.2012.32.2.170
In the nuclear industry, wall thinning defect of straight pipe occur the enormous loss in life evaluation and safety evaluation. To use non-destructive technique, we measure deformation, vibration, defect evaluation. But, this techniques are a weak that is the measurement of the wide area is difficult and the time is caught long. In the secondary side of nuclear power plants mostly used steel pipe, artificiality wall thinning defect make in the side and different thickness make to the each other, wall thinning defect part of deformation measure by using shearography. In addition, optical measurement through deformation, vibration, defect evaluation evaluate pipe and thickness defects of pressure vessel is to evaluate quantitatively. By shearography interferometry to measure the pipe`s internal wall thinning defect and the variation of pressure use the proposed technique, the quantitative defect is to evaluate the thickness of the surplus. The amount of deformation use thickness of surplus prediction of the actual thickness defect and approximately 7 percent error by ensure reliability. According to pressure the amount of deformation and the thickness of the surplus through DB construction, nuclear power plant pipe use wall thinning part soundness evaluation. In this study, pressure vessel of thickness defect measure proposed nuclear pipe of wall thinning defect prediction and integrity assessment technology development. As a basic research defected theory and experiment, pressure vessel of advanced stability and soundness and maintainability is expected to contribute foundation establishment.
Performance Comparison between Optical Fiber Type ESPI and Bulk Type ESPI for the Internal Defect in Pressure Vessel
Kim, Seong-Jong ; Kang, Young-June ; Hong, Kyung-Min ; Lee, Jae-Hoon ; Choi, Nak-Jung ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 2, 2012, Pages 177~184
DOI : 10.7779/JKSNT.2012.32.2.177
An optical defect detection method using ESPI(electronic speckle pattern interferometry) is proposed. ESPI is widely used as a non-contact measurement system which show deformation and phase map in real time. ESPI can be divided as the in-plane, out-of-plane and shearography by operation principle and target object and also divided with bulk type and optic fiber type by the optic configurations. This paper is focused on optic fiber type out-of-plane ESPI, which has the following advantages: (1) low cost; (2) reduction of the unreliable factors generated by separated optic components; (3) simplification of the optic configuration; (4) great reduction of volume; (5) flexibility, to be easily designed into different structures to adapt to inaccessible environments such as pipeline cavity and so on.
Design and Performance Evaluation of Shear Wave Phased Array Ultrasonic Transducer
Yoon, Byung-Sik ; Lee, Hee-Jong ; Braconnier, Dominique ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 2, 2012, Pages 185~191
DOI : 10.7779/JKSNT.2012.32.2.185
Typically, a wedge is involved to generate effectively high inspection angle in pipe weld inspection using phased array ultrasonic technique. But the usage of this wedge for weld or access limited area can cause coverage limitation for the examination volume because of the wedge front length. Therefore, the shear wave phased array probe which can generate high inspection angle without wedge is essentially necessary. In this paper, the shear wave phased array ultrasonic probe which can generate high inspection angle designed by modeling and manufactured from the modelling result. And this shear wave probe tested whether it can detect and sizing for EDM test block that contains various depth. As results, the experimental results show that the designed shear wave phased array probe can detect and size with reliable accuracy. Therefore if this phased array probe apply in field inspection, it is expected that it show more reliable inspection result for plant structure having access limitation.
Study on Non-contact Detection of Surface Cracks of the Metals Using an Open-Ended Coaxial Line Sensor at X-band
Yang, Seung-Hwan ; Kim, Dong-Seok ; Kim, Ki-Bok ; Kim, Jong-Heon ; Kang, Jin-Seob ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 2, 2012, Pages 192~197
DOI : 10.7779/JKSNT.2012.32.2.192
In this paper, a non-contact microwave technique was presented to detect the surface crack of the metals. An open-ended coaxial cable line was used as a sensor at 11 GHz, and the reflection coefficients were measured by scanning along the metal surface including artificial surface cracks. A parameter, the K value which was defined as the difference between maximum and minimum reflection coefficients, was measured and used to estimate the crack depth. A linear relationship between the K value and crack depth was found. This study showed that non-contact detection of the surface cracks of metals is possible using the open-ended coaxial line sensor at X-band.
Review of Micro/Nano Nondestructive Evaluation Technique (I): Surface and Subsurface Investigation
Kim, Chung-Seok ; Park, Ik-Keun ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 2, 2012, Pages 198~209
DOI : 10.7779/JKSNT.2012.32.2.198
The present paper reviews the widely used surface microstructural investigation technique and micro/nano nondestructive evaluation(NDE) technique which is able to evaluate the surface and subsurface. In general, the micro/nano defects and microstructural state of surface have great influence on the mechanical, physical, and chemical properties of bulk materials. The investigation technique of surface microstructure is possible to evaluate the defects and microstructural state with high reliability. The various applications and developments of each inspection technique have been introduced. Consequently, it is thought that the technique developments and applications of micro/nano NDE in nondestructive industries are extensively possible hereafter.
Principles of Pulsed Eddy Current Nondestructive Testing
Suh, Dong-Man ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 2, 2012, Pages 210~213
DOI : 10.7779/JKSNT.2012.32.2.210
Advances in Hardware of Ultrasonic Propagation Imaging System
Jeong, Hyo-Mi ; Lee, Jeong-Ryul ; Park, Chan-Ik ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 2, 2012, Pages 214~219
DOI : 10.7779/JKSNT.2012.32.2.214