• Title/Summary/Keyword: Nondestructive Inspection

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A study on appropriate nondestructive inspection methods of gear units for rolling stock (전동차 대치차 기어의 적절한 탐상법에 관한 연구)

  • Lee, Jae-Il;Lee, Min-Yeol;Lee, Won-Hak;Son, Young-Jin
    • Proceedings of the KSR Conference
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    • 2010.06a
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    • pp.571-582
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    • 2010
  • Typically nondestructive inspection methods of the large gear units are applied to penetrate non-destructive inspection. Nondestructive penetrating inspection put into the small openings of the defect to penetration liquid, remove to excess penetration liquid on the surface of the gear units, spread with developing solution and we can find the small defect by coating with penetration liquid. However, this method has so many issues because of penetrate nondestructive tests on the gear assembly. The steep angle of screw is hard to achieved full penetration and has the problem to remove the excess. In contrast, the magnetic nondestructive inspection is easy to detect subsurface defects and subtle defects. According to the inspection results the stress concentrates in gear surface, some internal defects and microscopic flaws exist on the gear units are not found to penetrate the nondestructive inspection, but magnetic nondestructive inspection could have found many defect. Therefore, a reasonable method of nondestructive inspection for the large gear units is suitable to magnetic nondestructive inspection.

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A Simulation Tool for Ultrasonic Inspection

  • Krishnamurthy, Adarsh;Mohan, K.V.;Karthikeyan, Soumya;Krishnamurthy, C.V.;Balasubramaniam, Krishnan
    • Journal of the Korean Society for Nondestructive Testing
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    • v.26 no.3
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    • pp.153-161
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    • 2006
  • A simulation program SIMULTSONIC is under development at CNDE to help determine and/or help optimize ultrasonic probe locations for inspection of complex components. SIMULTSONIC provides a ray-trace based assessment for immersion and contact modes of inspection. The code written in Visual C++ operating in Microsoft Windows environment provides an interactive user interface. In this paper, a description of the various features of SIMULTSONIC is given followed by examples illustrating the capability of SIMULTSONIC to deal with inspection of canonical objects such as pipes. In particular, the use of SIMULTSONIC in the inspection of very thin-walled pipes (with 450 urn wall thickness) is described. Ray trace based assessment was done using SIMULTSONIC to determine the standoff distance and the angle of oblique incidence for an immersion mode focused transducer. A 3-cycle Hanning window pulse was chosen for simulations. Experiments were carried out to validate the simulations. The A-scans and the associated B-Scan images obtained through simulations show good correlation with experimental results, both with the arrival time of the signal as well as with the signal amplitudes.

Systems Engineering Method to Develop Multiple BMI Nozzle Inspection System for APR1400

  • Abdallah, Khaled Atya Ahmed;Nam, GungIhn
    • Journal of the Korean Society of Systems Engineering
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    • v.12 no.1
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    • pp.25-40
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    • 2016
  • The Systems Engineering (SE) approach is characterized by the application of a structured engineering methodology for the design of a complex system or component. In this study, the SE methodology is used to design a nondestructive inspection system for Bottom Mounted Instrumentation (BMI) nozzles. We developed a system that enables nondestructive inspection of BMI nozzles during regular refueling outage without removing the reactor internals. A special ultrasonic (UT) probe is introduced to scan and detect cracks within the weld region of the nozzle. A 3D model of the inspection structure system was developed along with the reactor pressure vessel (RPV) and internals which permits a virtual 3D simulation of the operation to check the design concept and effectiveness of the system and to provide a good visualization of the system. This approach allows for a virtual walk through to verify the proposed BMI nozzle inspection system.

Models of Reliability Assessment of Ultrasonic Nondestructive Inspection (초음파 비파괴검사의 신뢰도 평가 모델)

  • Park, I.K.;Park, U.S.;Kim, H.M.;Park, Y.W.;Kang, S.C.;Choi, Y.H.;Lee, J.H.
    • Journal of the Korean Society for Nondestructive Testing
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    • v.21 no.6
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    • pp.607-611
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    • 2001
  • Ultrasonic inspection system consist of the operator, equipment and procedure. The reliability of results in ultrasonic inspection is affected by its ability. Furthermore, the reliability of nondestructive testing is influenced by the inspection environment, materials and types of defect. Therefore, it is very difficult to estimate the reliability of NDT due to the various factors. In this study, the probability of detection by logistic probability model and Monte Carlo simulation is used for the reliability assessment of ultrasonic inspection. The utility of the NDT reliability assesment is verified by the analysis of the data from round robin test nth these models.

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Analytical Beam Field Modeling Applied to Transducer Optimization and Inspection Simulation in Ultrasonic Nondestructive Testing

  • Spies, Martin
    • Journal of the Korean Society for Nondestructive Testing
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    • v.23 no.6
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    • pp.635-644
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    • 2003
  • To ensure the reliability of ultrasonic nondestructive testing techniques for modern structural materials, the effects of anisotropy and inhomogeneity and the influence of non-planar component geometries on ultrasonic wave propagation have to be taken into account. In this article, fundamentals and applications of two analytical approaches to three-dimensional elastic beam field calculation are presented. Results for both isotropic materials including curved interfaces and for anisotropic media like composites are presented, covering field profiles for various types of transducers and the modeling of time-dependent rf-signals.

Inspection of A Deteriorated Bridge Pier Cap Using Common Nondestructive and Destructive Test (파괴 및 비파괴 검사를 이용한 노후 교량의 교각 두부 조사)

  • Kim, Tae Wan;Hong, Sung Nam;Han, Kyoung Bong;Park, Sun Kyu
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.12 no.2
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    • pp.91-102
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    • 2008
  • Nondestructive testing techniques have been historically and commonly used to evaluate the quality of existing concrete structures. The techniques utilized included visual inspection, hammer sounding, Schmidt hammer rebounding, and ultrasonic pulse velocity testing including tomographic imaging. Results of the nondestructive tests were used to determine areas to be tested with local destructive tests. These tests included concrete compressive strengths, chloride testing, and petrographic testing. The overall results indicate that inside core of each of the pier caps are healthy. On all of the pier caps, extensive exterior concrete layer rehabilitation needs to be completed. This paper shows the application and interpretation of common nondestructive testing techniques and the consequent repair, rehabilitation, maintenance decisions and safety assesment.

Nondestructive Inspection of Launch Vehicle Structural Components (우주 발사체 구조 요소의 비파피검사)

  • Kong, Cheol-Won;Youn, Jong-Hoon;Park, Jae-Sung;Eun, Se-Won;Jang, Young-Soon;Yi, Yeong-Moo
    • Journal of the Korean Society for Nondestructive Testing
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    • v.29 no.4
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    • pp.331-337
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    • 2009
  • Space launch vehicles require highly reliable, lightweight structures. It is thus important to monitor the structural health of these components with nondestructive inspections. In this paper, we studied an example of a nondestructive inspection that was partially applied to the manufacture and inspection of a launch vehicle. Ultrasonic tests, X-rays, tapping, and acoustic emissions comprised the inspection method. A payload fairing, high pressure tank, fastener part, and bonding part were used as hardware to be inspected. We proposed a quantitative standard for debonding inspection of the payload fairing and acoustic emission data for the proof test of the high pressure tank. We analyzed the fracture mode of the sandwich fastener part according to frequency changes. We also proposed a standard specimen for ultrasonic inspection of bonds of different materials. The present analyses and results provide data for evaluation of the launch operation sequence to ensure launch vehicles afford high reliability.