• Title, Summary, Keyword: 압력용기

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Probabilistic Fiber Strength of Composite Pressure Vessel (복합재 압력용기의 확률 섬유 강도)

  • 황태경;홍창선;김천곤
    • Composites Research
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    • v.16 no.6
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    • pp.1-9
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    • 2003
  • In this paper, probabilistic failure analysis based on Weibull distribution function is proposed to predict the fiber strength of composite pressure vessel. And, experimental tests were performed using fiber strand specimens, unidirectional laminate specimens and composite pressure vessels to confirm the volumetric size effect on the fiber strength. As an analytical method, the Weibull weakest link model and the sequential multi-step failure model are considered and mutually compared. The volumetric size effect shows the clearly observed tendency towards fiber strength degradation with increasing stressed volume. Good agreement of fiber strength distribution was shown between test data and predicted results for unidirectional laminate and hoop ply in pressure vessel. The site effect on fiber strength depends on material and processing factors, the reduction of fiber strength due to the stressed volume shows different values according to the variation of material and processing conditions.

Reliability Evaluation of a Composite Pressure Vessel (복합재 압력 용기의 신뢰도 예측)

  • Hwang Tae-Kyung;Park Jae-Beom;Kim Hyoung-Geun;Doh Young-Dae;Moon Soon-Il
    • Composites Research
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    • v.19 no.3
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    • pp.7-14
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    • 2006
  • In this paper, an integrated probabilistic strength analysis was conducted to predict the reliability of a composite pressure vessel under inner pressure loading condition. As a probabilistic strength analysis, the probabilistic progressive failure model consisting of progressive failure model and Monte Carlo simulation was incorporated with a commercial FEA code, ABAQUS Standard, to perform the probabilistic failure analysis of composite structure which has a complex shape and boundary conditions. As design random variables, the laminar strengths of each direction were considered. Finally, from probabilistic strength analysis, the scattering of burst pressure could be explained and the reliability of composite pressure vessel could be obtained for each component. In case of composite structures in mass production, the effects of uncertainties in material and manufacturing on the performance of composite structures would apparently become larger. So, the probabilistic strength analysis is essential for the structural design of composite structures in mass production.

Strength Safety Evaluation of Composite Pressure Container for Hydrogen Fuel Tanks (수소연료탱크용 복합소재 압력용기에 관한 강도안전성 평가연구)

  • Kim, Chung-Kyun;Kim, Do-Hyun
    • Journal of the Korean Institute of Gas
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    • v.15 no.1
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    • pp.30-34
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    • 2011
  • This paper presents a strength safety evaluation of composite pressure container for hydrogen fuel tanks with a storage capacity of 104 liter and 70MPa pressure. The carbon fiber composite container is manufactured by an aluminum liner of Al6061-T6 and composite multi-layers of hoop winding layer in circumferential direction, $12^{\circ}C$ inclined winding layer and $70^{\circ}C$winding layer in helical direction respectively. The FEM results on the strength safety of composite fuel tanks were evaluated with a criterion of design safety of US DOT-CFFC and KS B ISO 11119-2 codes. The FEM computed results indicate that the proposed design model of 104 liter composite container is safe based on two strength safety codes. But, the computed results of carbon fiber fuel tanks based on US DOT-CFFC code is safer compared with that of KS B ISO 11119-2. Thus the hydrogen gas pressure container of 70MPa may be evaluated and designed by US DOT-CFFC code for more strength safety.

A Study on the Design Safety of Metal Seals in High Pressure Vessels (초고압 압력용기에서 메탈시일의 설계 안전성에 관한 연구)

  • Kim Chung Kyun
    • Journal of the Korean Institute of Gas
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    • v.9 no.1
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    • pp.26-32
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    • 2005
  • This paper presents the design safety of metal seals in pressure vessels. For a high-pressure vessel, a metal seal is usually used as a primary sealing, and an elastomeric rubber O-ring is adopted as a secondary sealing unit. The FEM computed results show that an aluminium material for sealing a gas leakage is superior to a steel one because of the thermal expansion rate. The deformation and stress distributions on the metal seal and pressure vessel structures are mainly dominated by transferred temperature compared to those of the gas pressure in which is supplied by an external pump. Thus, the temperature of a metal seal material should be restricted to under $200^{\circ}C$.

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Study of Quantitative Assessment Standard for Type 1 and Type 2 Gas Cylinders Using Acoustic Emission Testing (음향방출법을 이용한 Type 1 및 Type 2 가스실린더의 정량적 평가기준에 대한 연구)

  • Kim, Dong-Hyun;Lee, Sang-Bum;Kim, Kyung-Hoon;Yoon, Dong-Jin;Bae, Dong-Myung
    • Journal of the Korean Society for Nondestructive Testing
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    • v.34 no.2
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    • pp.176-183
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    • 2014
  • Acoustic emission testing (AET) of cylinders is advantageous in that it can be directly conducted on cylinders installed in a car, without needing to dissemble them on a real-time basis. Therefore, users prefer AET over other nondestructive testing methods. Owing to these advantages of AET, it has been approved by the Department of Transportation of the U.S. as a safety evaluation method for pressure containers or as an alternative to the hydroproof testing method. This paper presents a study of the quantitative evaluation criteria for a container having ultrasonic testing defects and also for Type 1 and Type 2 gas cylinders, which are defective seamless pressure containers provided by NK, a manufacturer of pressure containers. For the Type 1 cylinder, the process from crack growth to leak was observed in a repetitive fatigue test using a 113 L container according to ASTM E 1419-02. Further, for the Type 2 cylinder, integrity was evaluated using a 119 L sound container and a container damaged by hydraulic pressure, by the slow-fill method according to ASTM E 2191-02. Based on the AET results of the Type 1 and Type 2 cylinders, quantitative evaluation criteria were established for a defective and non-defective container.

A Study on the Structural Analysis with Geometry Design for Dome of a Composite Pressure Vessel (복합재 압력용기의 돔형상 설계에 따른 구조 해석)

  • Kim, Minsik;Bae, Joochan;Kim, Donggeon
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • pp.825-831
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    • 2017
  • In this study, we perform the design of dome geometry for the composite pressure vessel with applying the equation of Fulton and Vasiliev considering external load(thrusts). Variables of the dome geometry are opening radius ratio(${\rho}_0$) from 0.1 to 0.5 and thrust level from 40kN to 200kN. We conduct Finite Element Analysis(FEA) by using ABAQUS. As a result, the strain of the composite pressure vessel has shown strain gradient from inner to outer of dome surface. And the strain gradient may cause crack of resin inside the composite laminate. Strain gradient of Fulton dome is monotonously decreased as the ${\rho}_0$ increases, but the strain gradient of Vasiliev dome bas shown some different trend. when ${\rho}_0{\leq}0.1$, strain gradient of Fulton's is higher than Vasiliev's. But when 0.1<${\rho}_0$<0.35, strain gradient of Vasiliev's becomes higher than Fulton's. And in the case of $0.35{\leq}{\rho}_0$, strain gradient of Vasiliev's is higher than Fulton's. So the Vasiliev dome is more effective in ${\rho}_0{\leq}0.1$ condition and Fulton dome is more effective in $0.35{\leq}{\rho}_0$ condition. So, it's important for dome design to consider the crack of resin cause of the strain gradient.

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복합재 압력용기의 비파괴 시험과 평가

  • Jeong, Hyeon-Jo
    • Defense and Technology
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    • no.10
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    • pp.38-42
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    • 1992
  • 복합재 압력용기의 제작 및 사용중에 발생하는 결함(손상)의 비파괴검사를 통해 구조물의 건전성을 평가하는 것은 제품의 품질보증 관점에서 아주 중요합니다. 복합재에서는 여러 종류의 결함이 동시에 존재할수 있으며, 결함-기계적 성질-비파괴특성 사이의 상호관계는 완전히 알려져 있지 않습니다. 이글에서는 복합재 연소관에 존재하는 결함의 위험도와 결함 탐지를 위한 비파괴 검사 기법에 대해 먼저 살펴보았습니다. Filament Winding으로 제조한 복합재 연소관의 Proof Testing과 관련해 음향방출(AE)법에 의한 최근의 연구결과를 살펴본 다음, 연소관의 신뢰도 확보를 위한 비파괴 평가 방법에 대해 앞으로의 연구 방향을 제시하였습니다

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Status and Prospects of Nuclear Boiler and Pressure Vessel Code in Foreign Countries (주요 국가의 원전용 보일러 및 압력용기 기술기준 현황과 전망)

  • 김남하
    • Journal of the KSME
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    • v.33 no.8
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    • pp.717-727
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    • 1993
  • 주요국의 보일러 및 압력용기의 기술기준 개발방향이 금속재료기술의 발달, 비파괴검사 기술의 개발, 용접기술의 급진전, 품질요건의 국제적인 규정의 제정 및 준수 등의 현상으로 볼 때 이를 대체적으로 수용하는 ASME Sec. III의 방향으로 통합되어 가는 느낌을 받고 있다. 따라서 우 리나라도 전담기구의 설립 또는 지정을 서둘러 장기적인 안목에서 체계적으로 대처하여야 급격히 변화하는 세계적인 기술흐름에 맞추어 우리의 관련산업이 지속적으로 발전 될 수 있으며 이와 관련된 기술개발방향이 바르게 갈 수 있을 것이다.

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Shape Design of Pressure Vessel Dome (압력용기의 도움 형상설계)

  • 이영신;조원만
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.15 no.3
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    • pp.1057-1062
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    • 1991
  • 본 연구에서는 형상을 미소하게 변화시켜 좌굴을 방지할 수 있는 최적 도움형 상을 설계하였고 타원형, 토리-구형도움의 가장 얕은 형태의 최적도움형상도 설계하였] 으며, 실제 적용예를 수치로 제시하였다. 또한 수압(hydrostatic pressure)을 받는 수조(reservoir)의 도움형상에 대해서도 직경 및 길이 변화에 따른 형상설계 결과를 제시하였다.

Structural Optimization Study about Support Structure of Pressure Container (압력용기 지지구조물의 구조최적화 연구)

  • Kim, Chang-Sik
    • Journal of the Korea Institute of Military Science and Technology
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    • v.8 no.2
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    • pp.22-29
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    • 2005
  • In this study we performed topology optimization and size optimization about support structure of pressure container which is installed in a Common Bed. The optimization study shows that structure weight optimization results can be applied to navy ship. The topology optimization is performed by static load, homogenization and optimality criteria method and size optimization is performed by SOL200 of NASTRAN.