• Title/Summary/Keyword: nondestructive test (NDT)

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Introduction to Electromagnetic Nondestructive Testing (전자기 비파괴검사의 소개)

  • Shin, Young-Kil
    • Proceedings of the KIEE Conference
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    • 1994.07a
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    • pp.122-124
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    • 1994
  • The purpose of this paper is to attract electrical and electronic engineering community's attention to electromagnetic nondestructive testing (NDT). Various electromagnetic NDT methods of detecting defects in materials are presented to help understand the underlying physics associated with these techniques. This understanding would provide a way to interpret the test signal to describe about the defect. In the meantime, the author hopes, one may realize how perfectly fit such a subject as electromagnetic NDT is to current curriculums of electrical and electronic engineering.

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A Study on the Three Dimensional Measurement of Internal Cavity by Using X-Ray NDT Method (X선 비파괴시험에 의한 내부 기공의 3차원 측정 연구)

  • Lim, Soo-Yong;Choi, Yong-Kyu
    • Journal of the Korean Society for Nondestructive Testing
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    • v.14 no.3
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    • pp.177-184
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    • 1994
  • The three dimensional measuring method with minimizing operational errors for the arbitrary shaped-internal cavity based on the information of the X-ray nondestructive test is presented. Two experimental tests using artificial cavities were considered in order to verify the availity of PEVACA. In these test, X-ray NDT was conducted for detecting cavities, and the comparion between the calculating values from PEVACA and the real values from measuring the cavities was performed. As a result of this study, three dimensional cavities information using PEVACA are in good agreement with the real measured values within ${\pm}0.5mm$. The computer code, "PEVACA", contributes not only to improvement of data accuracy but also to saving of the work time and data documentation.

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A Study on the Nondestructive Test Optimum Design for a Ground Tracked Combat Vehicle (지상궤도전투장비의 비파괴검사 최적설계방안에 대한 연구)

  • Kim, Byeong Ho;Seo, Jae Hyun;Gil, Hyeon Jun;Kim, Seon Hyeong;Seo, Sang Chul
    • Journal of the Korean Society for Nondestructive Testing
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    • v.35 no.5
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    • pp.358-366
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    • 2015
  • In this study, a nondestructive test (NDT) is performed to inspect the optimal design of a ground tracked combat vehicle for self-propelled artillery, tank, and armored vehicles. The minimum qualification required for personnel performing the NDT of a ground tracked combat vehicle was initially established in US military standards, and then applied to the Korean defense specifications to develop a ground tracked combat vehicle. However, the qualification standards of an NDT inspector have been integrated into NAS410 through the military and commercial specifications unification project that were applied in the existing aerospace/defense industry public standard. The design method for this study was verified by applying the optimal design to the liquid penetrant testing Al forging used in self-propelled artillery. This confirmed the reliability and soundness of the product.

Remote NDT for Inspection of Reactor Vessel Components of fast Breeder Test Reactor

  • Anandapadmanaban, B.;Srinivasan, G.;Kapoor, R.P.
    • Journal of the Korean Society for Nondestructive Testing
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    • v.23 no.5
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    • pp.520-525
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    • 2003
  • Fast Breeder Test Reactor (FBTR) is a 40MW (thermal) / 13.2MW (electrical), Plutonium - Uranium mixed carbide fuelled, sodium cooled, loop type nuclear reactor operating at Indira Gandhi Centre for Atomic Research (IGCAR), Kalpakkam. Its main aim is to generate experience in operation of fast reactors and sodium systems and to serve as an irradiation facility for development of fuels and structural materials fur fast reactors. Nuclear reactors pose difficulties to the NDT techniques used to monitor the conditions of the internal components. Sodium cooled fast breeder reactors have their own typical difficulties in using the NDT techniques. These are due to the need for operation in aggressive environment of nuclear radiation and sodium (molten/vapour), as well as the need to maintain leak tightness of a very high order during all states of reactor operation and shutdown for fuel handling, maintenance and remote inspection. This paper discusses the following NDT techniques, which have been successfully used for the past 15 years in FBTR: (i) Periscope and Projector, (ii) Core Co-ordinate Measuring Device and, (iii) Optical fiberscope. The inspection using these techniques have given confidence for further reactor operation at high power by giving useful data on the conditions of the components inside the reactor vessel.

The Evaluation of GFRP Pipe by NDT Methods (비파괴시험에 의한 GFRP Pipe의 평가)

  • Lee, J.S.;Cho, K.S.;Chang, H.K.;Lee, S.H.
    • Journal of the Korean Society for Nondestructive Testing
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    • v.9 no.1
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    • pp.48-55
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    • 1989
  • It is desirable to develop the effective NDT techniques to evaluate the strength of composite structures. In this study several of acoustic NDT techniques were applied to investigate useful parameters for evaluating the filament wound GFRP structures and following results were obtained. 1. Propagation velocity of stress wave to axial direction in the filament wound GFRP pipe depends on the effective modulus along the propagation direction and source location was parcticable from the a measured velocities. 2. By the application of acoustic emission techniques to GFRP pipe during hydraulic test, it was proven to be possible to detect the damage initiating pressure which could be evaluated nondestructively through the measuring of stress wave energy factor(SWEF). 3. The final failure pressure of GFRP was greatly influenced in the presence of pass through defects, and void-like defects were more dangerous than the laminar type defects.

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ACOUSTIC EMISSION TESTING OF SPHERICAL PRESSURE VESSEL DURING HYDROTESTS (수압시험중(水壓試驗中)의 구행압력용기(球型壓力容器)에 대(對)한 AE검사(檢査))

  • Chang, Hong-Keun;Lee, Joo-Suk;Cho, Kyung-Shik
    • Journal of the Korean Society for Nondestructive Testing
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    • v.3 no.1
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    • pp.12-18
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    • 1983
  • This paper describes the procedures and results of an acoustic emission testing performed during hydrotest of spherical pressure vessel for propane storage. A computer based multi-channel real time monitoring and source location analysis AET-4900 system was used for AE testing. The vessel was extremely quiet throughout the entire test run and especially 6 to $14.5kg/cm^{2}$, it is normal operating pressure range. After exceeding $14.5kg/cm^{2}$, one of the 20 sections showed the most event in any one section 11 total but there were scattered at different locations. In order to confirm the events seen in horizontal weld line of that section, proof testing was performed with ultrasonics and radiography.

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A Study on PZT-5A Probe for Nondestructive Inspection (비파괴검사를 위한 PZT-5A 탐촉자에 관한 연구)

  • 황현석
    • Electrical & Electronic Materials
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    • v.10 no.2
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    • pp.119-125
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    • 1997
  • In this study, piezoelectric transducers were designed and manufactured using PZT-5A which had relatively high electromechanical coefficient, nondestructive testing system was developed which was able to inspect automatically using stepping motors, PC-Lab, and PC-Scope. The optimum design conditions for NDT were presented and verified comparing PZT-5A probes with comercial probes. It was proved by simulation and experiments that Epoxy is a good material as matching and backing layers. The envelope was reduced 60% with matching layer and 76% with matching and backing layer. NDT was successfully carried out for aluminum test pieces. Distance error of PZT-5A probe was 2.8%.

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Nondestructive Evaluation and Microfailure Modes of Single Fibers/Cement Composites using Electro-Micromechanical Technique and Acoustic Emission (Electro-Micromechanical 시험법과 음향방출을 이용한 단섬유시멘트복합재료의 미세파괴구조와 비파괴적 평가)

  • Lee, Sang-Il;Kim, Jin-Won;Park, Joung-Man;Yoon, Dong-Jin
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2001.05a
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    • pp.258-262
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    • 2001
  • The contact resistivity was correlated with IFSS and microfailure modes in conductive fiber/cement composites electro-pullout and AE. As IFSS increased, the number of AE signals increased and the contact resistivity increased latter to the infinity. In dual matrix composite (DMC) test and AE, the number of signals with high amplitude and energy in g]ass fiber composite is significantly larger than that of no-fiber composite. Many vertical and diagonal cracks were observed in glass fiber and no-fiber composite under tensile test, respectively. Electro-micromechanical technique and AE can be used efficiently for sensitive nondestructive (NDT) evaluation and to detect microfailure mechanisms in various conductive fibers reinforced brittle and nontransparent cement composites.

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Safety Evaluation of Bogie Frame for Tilting Railway Vehicles by Fatigue and Nondestructive Tests (피로시험 및 비파괴 검사를 통한 틸팅열차용 주행장치 프레임의 안전성 평가)

  • Kim Jung-Seok;Kim Nam-Po
    • Journal of the Korean Society for Railway
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    • v.8 no.5
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    • pp.419-424
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    • 2005
  • This paper has performed fatigue and nondestructive test of bogie frame for Korean tilting train. Before the fatigue test, static tests were carried out. From the test, the structural safety was investigated using Goodman diagram. After the static test, the fatigue test were conducted under tilting load conditions. The fatigue test was conducted for $10{\times}10^6$ cycles. During the fatigue test, the nondestructive tests using magnetic particle and liquid penetrant were performed at $6{\times}10^6$ cycle and $10{\times}10^6$cycle. From the crack detection tests, it was known that there was no fatigue crack in the bogie frame.