• Title/Summary/Keyword: Semi-Geodesic Path Equation

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Analysis of Filament Wound Pressure Tank Considering Winding Angle Variation in Thickness Direction (두께 방향의 와인딩 각도 변화를 고려한 필라멘트 와인딩 된 압력탱크의 해석)

  • 김철웅;박재성;홍창선;김천곤
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2000.04a
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    • pp.211-214
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    • 2000
  • Filament wound pressure vessels have been studied for the efficient design tool to consider the variation of fiber angles through-the thickness direction. Filament winding patterns were simulated from semi-geodesic fiber path equation to calculate fiber path on arbitrary surface. Finite element analyses were performed considering fiber angle variation in longitudinal and thickness directions by ABAQUS. For the finite element modeling of the pressure tank, the 3-dimensional layered solid element was utilized. From the stress results of pressure tanks, maximum stress criterion in transverse direction was applied to modify material properties for failed region. In the end of each load increment, resultant layer stresses were compared with a failure criterion and properties were reduced to 1/10 for a failed layer. Results of progressive failure analysis were compared with two experimental data.

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O Analysis of Filament Wound Pressure Tank Considering Winding Angle Variation In Thickness Direction (두께 방향의 와인딩 각도 변화를 고려한 필라멘트 와인딩 된 압력탱크의 해석)

  • 김철웅;박재성;홍창선;김천곤
    • Composites Research
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    • v.13 no.2
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    • pp.51-60
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    • 2000
  • Filament wound pressure vessels have been studied for the efficient design tool to consider the variation of fiber angles through-the thickness direction. Filament winding patterns were simulated from semi-geodesic fiber path equation to calculate fiber path on arbitrary surface. Finite element analyses were performed considering fiber angle variation in longitudinal and thickness directions by ABAQUS. For the finite element modeling of the pressure tank, the 3-dimensional layered solid element was utilized. From the stress results of pressure tanks, maximum stress criterion in transverse direction was applied to modify material properties for failed region. In the end of each load increment, resultant layer stresses were compared with a failure criterion and properties were reduced to 1/10 for a failed layer. Results of progressive failure analysis were compared with two experimental data.

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Structural Analysis and Strain Monitoring of the Filament Wound Composite Motor Case used in KSR-III Rocket (KSR-III 삼단 복합재 연소관의 구조 해석 및 변형률 측정)

  • 박재성;김철웅;조인현;오승협;홍창선;김천곤
    • Composites Research
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    • v.14 no.6
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    • pp.24-31
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    • 2001
  • Filament wound structures such as pressure tanks, pipes and motor cases of rockets are widely used in the aerospace application. The determination of a proper winding angle and thickness is very important to decrease manufacturing difficulties and to increase structural efficiency. In this study, possible winding angles considering the slippage between a fiber and a mandrel surface are calculated using the semi-geodesic path equation. In addition, finite element analysis using ABAcUS are performed to predict the behavior of filament wound structures considering continuous change of winding angle along the dome part. The water-pressuring tests of 3rd stage motor case are performed to verify the analysis procedure. The strain gages are attached on the surface in the fiber direction. Progressive failure analysis is performed to predict the burst pressure and the weakest region of the motor case. The effect of reinforcement is also studied to increase its performance.

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