• Title/Summary/Keyword: 압력용기

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Evaluation of Detectable Defect Size for Inner Defect of Pressure Vessel Using Laser Speckle Shearing Interferometry (레이저 스페클 전단간섭법을 이용한 압력용기 내부결함의 측정 가능한 결함 크기의 평가)

  • Kim, Kyeong-Suk;Seon, Sang-Woo;Choi, Tae-Ho;Kang, Chan-Geun;Na, Man-Gyun;Jung, Hyun-Chul
    • Journal of the Korean Society for Nondestructive Testing
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    • v.34 no.2
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    • pp.135-140
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    • 2014
  • Pressure vessels are used in various industrial fields. If a defect occurs on the inner or outer surface of a pressure vessel, it may cause a massive accident. A defect on the outer surface can be detected by visual inspection. However, a defect on the inner surface is generally impossible to detect with visual inspection. Nondestructive testing can be used to detect this type of defect. Laser speckle shearing interferometry is one nondestructive testing method that can optically detect a defect; its advantages include noncontact, full field, and real time inspection. This study evaluated the detectable size for an internal defect of a pressure vessel. The material of the pressure vessel was ASTM A53 Gr.B. The internal defect was detected when the pressure vessel was loaded by internal pressure controlled by a pneumatic system. The internal pressure was controlled from 0.2 MPa to 0.6 MPa in increments of 0.2 MPa. The results confirmed that an internal defect with a 25 % defect depth could be detected even at 0.2 MPa pressure variation.

Evaluation of the Residual Strength of CFRP Composite Pressure Vessel After Low Velocity Impact (CFRP 복합재압력용기의 충격후 잔류강도저하특성 평가)

  • Park, Jae-Beom;Kim, Dong-Ryun;Hwang, Tae-Kyung
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.439-442
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    • 2009
  • In this study, the residual strength of CFRP filament winding pressure vessel after low velocity impact was evaluated quantitatively. After impact test, the pressure vessel was sectioned to produce 25 mm-wide ring specimen and the bursting pressure of this specimen was measured. A finite element model was also fabricated to investigate the deformation and stress distribution characteristics of the impacted CFRP vessel. The degradation of the residual strength along with the increase of impact energy was successfully measured and reviewed.

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Evaluation of Residual Strength of CFRP Pressure Vessel After Low Velocity Impact (저속 충격 하중을 받은 탄소섬유강화 복합재 압력용기의 잔류강도 저하 평가)

  • Park, Jae-Beom;Kim, Dong-Ryun;Kim, Hyung-Geun;Hwang, Tae-Kyung
    • Composites Research
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    • v.21 no.3
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    • pp.9-17
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    • 2008
  • In this paper, the low velocity impact characteristics of filament winding CFRP pressure vessel was investigated using numerical and experimental methods. The cylinder part of CFRP vessel was impacted using triangular shape impactor which simulated the sharp edge of dropping tools and impact response behavior of CFRP was reviewed. The mechanical behavior, such as deformation and stress distribution, were also predicted by explicit finite element method and the validity of the model was investigated. For the quantitative evaluation of the residual strength of the pressure vessel after impact, a series of the ring specimens was cut from the impacted vessel and its burst pressure was measured by hydraulic pressure hoop tension test. As the results, the relationship between the residual strength degradation and the impact energy was successively obtained and a useful methodology to evaluate quantitatively the impact damage tolerance of CFRP pressure vessel was established.

원자로 압력용기소재 신뢰성 평가 및 향상기술

  • Yun, Ji-Hyeon
    • Journal of the KSME
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    • v.55 no.10
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    • pp.31-35
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    • 2015
  • 이 글에서는 원자력발전소의 안전성 확보를 위한 원자로 압력용기 재료의 신뢰성 평가 및 향상기술에 대해 개괄적으로 기술하였다. 압력용기 소재의 중요성과 가동 중 건전성 평가기술에 대해 다뤘으며 특히, 조사취화특성 평가와 관련한 기술현황을 중점적으로 소개하였다.

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Test Method to Evaluate the Fiber Material Properties of Filament Wound Composite Pressure Vessel (필라멘트 와인딩 복합재 압력용기의 섬유 방향 물성 평가 기법)

  • Hwang, Tae-Kyung;Park, Jae-Beom;Kim, Hyoung-Geun
    • Composites Research
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    • v.23 no.3
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    • pp.37-42
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    • 2010
  • The fiber material properties, elastic constant and strength, are the most important factors among the various material properties for the design of composite pressure vessel, because of it's dominant influence on the performance of composite pressure vessel. That is, the deformation and burst pressure of pressure vessel highly affected by the fiber material properties. Therefore, the establishment of test method for exact fiber material properties is a priority item to design a composite pressure vessel. However, the fiber material properties in filament wound pressure vessel is very sensitive on various processing variables (equipment, operator and environmental condition etc..) and size effect, so that it isn't possible to measure exact fiber material properties from existing test methods. The hydro-burst test with full scale pressure vessel is a best method to obtain fiber material properties, but it requires a enormous cost. Thus, this paper suggests a newly developed test method, hoop ring test, that is capable of pressure testing with ring specimens extracted from real composite pressure vessel. The fiber material properties from hoop ring test method showed good agreement with the results of hydro-burst test with full scale composite pressure vessels.

A Study on the Sealing Characteristics of O-rings in Gas Pressure Vessel (O-링이 장착된 가스압력용기의 밀봉특성에 관한 연구)

  • Kim Chung Kyun;Cho Seung Hyun
    • Journal of the Korean Institute of Gas
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    • v.7 no.3
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    • pp.51-57
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    • 2003
  • This paper presents the temperature distribution and deformation characteristics of O-ring groove geometry in which is strongly related the sealing performance of pressure vessels. A working gas in pressure vessel may be heated by a heater and pressurized by a gas compressor. Thus, the pressure vessel should keep high Pressure and temperature for a limited working period. For these operation conditions, the working gas in pressure vessels should not leak to the air by two O-rings with a rectangular groove. The FEM computed results indicate that the thermal and mechanical properties of metal sealing material is very important for stopping a leakage of hot gas in a vessel. Based on the results, high thermal conductive and low mechanical strength material is recommended as a metal sealing one. This may improve the sealing characteristics of O-ring sealing mechanism with a rectangular groove, which reduces the sealing gap between a flange and a cylinder and the width of O-ring groove.

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경수로 압력용기 모의실험 PCA-REPLICA 차폐 벤치마크 해석

  • 길충섭;김정도;황원국
    • Proceedings of the Korean Nuclear Society Conference
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    • pp.163-168
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    • 1998
  • 경수로 압력용기의 취화는 주로 고속 중성자에 기인한다. 경수로 압력용기를 모의한 PCA-REPLICA실험을 해석하여 원자력 시설의 구조재로 쓰이는 철의 핵자료 검증과 MATXS/TRANSX/DANTSYS 계산체제의 유용성을 확인하고자 하였다. 라이브러리는 JEF-2.2를 이용한 KAFAX-F22가 기본 자료로 이용되었고, 이밖에 ENDF/B-Vl.1과 JENDI.-3.2의 철 핵자료도 비교 검증하였다. 계산결과는 실험오차 등을 고려하면 측정치와 근접하는 경향을 보였고, 앞으로 개발될 차폐해석용 라이브러리 검증에 유용한 자료가 될 수 있겠다.

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A Study on Improving Fatigue Life for Composite Cylinder with Seamless Integrated Liner (이음매 없는 일체형 라이너를 갖는 복합재 압력용기의 피로수명 향상에 대한 연구)

  • Kim, Hyo-Joon
    • Journal of the Korean Institute of Gas
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    • v.17 no.6
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    • pp.46-51
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    • 2013
  • Composite cylinder is used by hydrogen fuel cell vehicles and natural gas vehicles because of high specific modulus, specific strength and fatigue resistance. composite cylinder has a seamless integrated liner and it is fully overwrapped with structural fibers of high strength carbon fibers in an epoxy matrix. In this study, filament winding pattern and autofrettage pressure design technique are presented considering structural weakness of knuckle and compressive residual stress. Presented methodology is verified by pressure cycling test of composite cylinders.

A Study on Model for Gas Venting Characteristic of Pressure Vessel for Propulsion System (추진체계 가압용 압력용기의 기체배출특성 모델에 관한 연구)

  • Hwang, Yoojun;Byun, Jung Joo;Lee, Ju Young;Kim, Kiun
    • Journal of the Korean Society of Propulsion Engineers
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    • v.22 no.3
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    • pp.134-142
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    • 2018
  • Developing model to predict the characteristic of vented gas was vented through an orifice is presented. Simulations with models which were developed with assumptions considering heat transfer inside the vessel were conducted. Also, representative pressure and temperature were measured from experiments with the pressure vessel which is applicable to a propulsion system. Developed model were verified with comparison between calculations and experiments.

Development of high-pressure composite cylinder for compressed hydrogen storage of fuel cell vehicle: type 3 composite cylinder (수소연료전지 차량용 350bar Type3 복합재 압력용기 실증기술 개발)

  • 박지상;김태욱;정상수;정재한
    • 한국전기화학회:학술대회논문집
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    • pp.201-206
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    • 2005
  • 본 연구는 기 개발 완료된 천연가스차량용 200bar급 Type 3 복합재 압력용기를 개발로 축척된 핵심요소기술과 실질적인 경험을 바탕으로 수소연료전지 차량에 탑재할 350bar급 Type 3 복합재 압력용기에 대한 설계/해석과 시험평가의 핵심적인 사항을 고찰하였다. 설계/해석에는 350bar급 Type 3 복합재 압력용기에 대한 3차원 비선형 유한요소 모델링 및 해석기법이 제시되었고, 설계된 라이너형상과 와인딩 패턴을 이용하여 필라멘트 와인딩 공법으로 1차시제품을 제작하였다. 제작된 시제품에 대하여 파열시험 및 반복피로시험을 수행하여 설계/해석 기법의 타당성을 검증하였다.

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