Molding by reactive injection of reinforced plastics

Reboredo, María Marta; Rojas, A. J.

doi:10.1002/pen.760280712

Cited by 20 publications

(8 citation statements)

References 2 publications

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“…A proper time increment will ensure a reasonable a p proximation. The time constant for the filling process may be defined as (19) The physical meaning of the time constant is the time required to fill up one pore volume. The time constants along the principal axes may not be the same in a directional fiber mat.…”

Section: Time Constant For the Guasi-steady-state Processmentioning

confidence: 99%

“…Many other researches in RTM/SRIM such as Cai (18). and Reboredo and Rojas (19) have been conducted to improve the quality of the products. Based on the 1-D Darcy's law and constant inlet pressure, Cai proposed two principles of design: (1) the arrangement of the vents should assure the shortest filling path, and (2) the line gates or the gate should be arranged on the larger side such that the fluid be injected from the larger side to the smaller side and the applied pressure required is thus reduced.…”

Section: Introductionmentioning

confidence: 99%

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Permeable boundary condition for numerical simulation in resin transfer molding

Hourng

1995

Polymer Engineering & Sci

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In the present study of resin transfer molding, an effective gap located between the side wall and the fiber mats is proposed. The concept of the effective gap leads to a permeable boundary condition on the interface between the fiber mats and the side wall. The porosity is no longer assumed to be a constant in the whole domain. Results show that the effective gap concept can explain the phenomena of edge effects reasonably. In our model, the filling process is simulated by the body‐fitted finite element method and the limitation of the time increment for the quasi‐steady state process is discussed in detail.

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Section: Time Constant For the Guasi-steady-state Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Permeable boundary condition for numerical simulation in resin transfer molding

Hourng

1995

Polymer Engineering & Sci

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“…We can denote kxx = kX, k,,y = k,&dquo; sXX = sx, and s,,,, = sy. Equation (1) can thus be reduced to…”

Section: Modeling Of the Filling Processmentioning

confidence: 99%

“…Various investigations have been conducted. Reboredo and Rojas [1] considered a one-dimensional flow in a rectangular mold. Heat convection was considered and a modified Darcy's law was used.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Resin Injection Molding in Molds with Preplaced Fiber Mats

Hourng

Chang

1993

Journal of Reinforced Plastics and Composites

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The non-isothermal flow-field of a mold filling process in resin injection molding with preplaced fiber mats is numerically simulated in the present article. A bodyfitted coordinate transformation is applied such that the irregular, moving flow front can be fitted exactly as a boundary, and the error induced from the treatment of boundary conditions is thus reduced. The effects of several parameters, such as types of mats, porosity, mold wall temperature and flow rate of resin at the inlet, on the filling process is deeply investigated.KEY WORDS: resin transfer molding (RTM), structure reaction injection molding (SRIM), flow in porous media.

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“…The permeability of the porous media depends on how the fibrous reinforcement is oriented and stacked in the mold cavity. The flow through a n isotropic or anise tropic fiber preform with the application to mold filling has been studied by many researchers (1)(2)(3)(4)(5)(6)(7)(8). Most of these studies are based on the assumption that the fiber preform in the mold cavity is rigid and Darcy's law or a modified Darcy's law can be used to simulate the process.…”

Section: Introductionmentioning

confidence: 99%

Fiber mat deformation in liquid composite molding. I: Experimental analysis

et al. 1993

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When a resin in injected into the mold in liquid composite molding, the preplaced fiber mat may deform near the inlet gate because of the high momentum carried by the injected fluid. A fiber free region near the gate followed by the fiber mat deformation may emerge. This phenomenon is most likely to occur when the stacked fiber mats have low permeability and the resin has high viscosity. A set of mold filling experiments were carried out using an instrumented metal mold and a small transparent mold to investigate the fiber mat deformation during mold filling. Experimental results showed that the fiber mat deformation was limited to a small region near the gate and that deformation greatly reduced the molding pressure. A forced fiber mat deformation employing a modified gate design was proposed to facilitate mold filling in liquid composite molding.

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Molding by reactive injection of reinforced plastics

Cited by 20 publications

References 2 publications

Permeable boundary condition for numerical simulation in resin transfer molding

Permeable boundary condition for numerical simulation in resin transfer molding

Numerical Simulation of Resin Injection Molding in Molds with Preplaced Fiber Mats

Fiber mat deformation in liquid composite molding. I: Experimental analysis

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