• Title/Summary/Keyword: 수지 주입구 위치

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Resin Flow Analysis of RTM Manufacturing Method for Design of Composite Fluid Storage Tank Structure (복합재료 유체 저장 탱크 구조 설계를 위한 RTM 공법 수지 유동 해석)

  • Park, Hyunbum
    • Journal of Aerospace System Engineering
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    • v.13 no.1
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    • pp.69-76
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    • 2019
  • In this study, resin flow analysis of resin transfer moulding (RTM) method was performed for mould design of composite structure. The target composite structure was a tank used for fluid storage. Natural c fiber composite was adopted for composite structural design of the fluid storage tank. RTM was adopted for manufacturing of the tank using natural fiber composites. Resin flow analysis was performed to find the proper RTM conditions of the tank. The resin flow analysis was performed using the commercial FEM flow simulation software. After repeated analysis while changing the location of resin inlet and outlet, the proper resin filling time and pattern were found.

A Study on Determining Optimal Gate Positions for Cavity Fill-Uniformity in Injection Molding Design (사출성형 설계에서 캐비티 충전 균형을 위한 수지 주입구의 최적 위치 결정에 관한 연구)

  • Park, Jong-Cheon;Seong, Yeong-Kyu
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.9 no.6
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    • pp.21-28
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    • 2010
  • This study shows an optimization procedure for an automatic determination on the gate position to ensure the fill-uniformity within a part cavity by using the injection molding simulation. For an optimization, the maximum pressure-difference within a part cavity induced at the stage of filling is used to evaluate degree of fill-uniformity. In addition, a direct search scheme based on the reduction of design space is developed and applied in the optimization problem. This corresponding proposed methodology was applied in the optimization on the gate location for a CD-tray molding, as a result, showed the improvement of the fill-uniformity within the cavity.

Analysis of RTM Process to Manufacture Composite Bogie Frame Considering Fiber Orientation (섬유방향성을 고려한 복합소재 대차 프레임의 RTM 성형 특성 해석)

  • Kim, Moo Sun;Kim, Jung-Seok;Kim, Seung Mo
    • Journal of the Korean Society for Railway
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    • v.18 no.4
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    • pp.301-308
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    • 2015
  • To reduce the weight of a railroad vehicle, a bogie frame skin is considered for manufacture using an RTM process and composite material. Compared to other processes, RTM has merits in that it demands only simple manufacturing facilities and can produce a large and complex structure in a short cycle time. On the other hand, it is important to determine the proper number and locations of gates and vents to prevent void formation inside a structure. In this study, we numerically predicted the flow pattern in a bogie frame skin during the RTM process by distinguishing the permeability of a fiber mat as isotropic or anisotropic. Using the results, we analyzed the RTM process conditions of the bogie frame to predict skin void formation, mold filling time, and optimum location of vents depending on the permeability conditions.

Three-Dimensional Numerical Simulation of Mold-Filing and Void Formation During Vacuum-Assisted Resin Transfer Molding (VARTM 공정에서의 금형 충전 및 기공 형성에 관한 3차원 수치해석)

  • 강문구;배준호;이우일
    • Composites Research
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    • v.17 no.3
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    • pp.1-7
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    • 2004
  • In the vacuum assisted RTM (VARTM) process that has become the center of attention for manufacturing massive composite structures, a good evacuation of air in the fiber preform is recognized as the prime factor. The microvoids, or the dry spots, are formed as a result of improper gate/vent locations and the mold geometry. The non-uniform resin velocity at the flow front leads to the formation of microvoids in the fibers, whereas the air in the microvoids can migrate along with the resin flow during mold filling. The residual air in the internal voids of a composite structure may cause a degradation of the mechanical properties as well as the structural failure. In this study, a unified macro- and micro analysis methods were developed to investigate the formation and transport of air in resin during VARTM process. A numerical simulation program was developed to analyze the three-dimensional flow pattern as well as the macro- and microscopic distribution of air in a composite part fabricated by VARTM process.