Experimental analysis and simulation of flow through multi-layer fiber reinforcements in liquid composite molding

1998 ◽  
Vol 19 (3) ◽  
pp. 246-256 ◽  
Author(s):  
M. L. Diallo ◽  
R. Gauvin ◽  
F. Trochu
Keyword(s):  
Experimental Analysis ◽  
Liquid Composite Molding ◽  
Composite Molding ◽  
Fiber Reinforcements ◽  
Flow Through ◽  
Layer Fiber

A Model for the Two-Phase Flow Through a Dual-Scale Porous Medium in Liquid Composite Molding

2007 ◽  
Author(s):  
N. K. Yamaleev ◽  
R. V. Mohan
Keyword(s):  
Porous Medium ◽  
Two Phase Flow ◽  
Fiber Bundles ◽  
Phase Flow ◽  
Liquid Composite Molding ◽  
Two Phase ◽  
Individual Fiber ◽  
Composite Molding ◽  
Flow Through ◽  
Dual Scale

The macroscopic flow during processing of composite structures by liquid composite molding is accompanied by the microscopic flow through individual fiber bundles. This concurrent microscopic flow occurs at length and time scales different than those of the macroscopic flow and influences the macroscopic flow behavior, impacting the void formation during composite manufacturing. A reduced-order model developed by the authors of this paper in [Proc. 2005 ASME Conf., IMECE2005-82436] for modeling the microscopic impregnation of individual fiber bundles is currently used to simulate the transient dynamics of the 1-D two-phase flow though a dual-scale porous medium during resin transfer molding (RTM). As has been show in our previous work [Inter. J. of Multiphase Flow, Vol. 32, pp. 1219–1233, 2006] the vapor-liquid phase transition and multidimensional effects of the gas entrapped inside fiber tows can play a significant role in the advancement of the macroscopic resin front and the formation of voids, thus indicating the need to account for these phenomena in the simulation of liquid composite molding processes. These effects are quantified by introducing a nonzero sink term into the right hand side of the mass conservation equation for the dual-scale porous medium, which couples the microscopic two-phase flow inside fiber bundles with the macro-flow through the perform. Two numerical methods, one of which is based on the moving coordinate system associated with the macroscopic resin front and the other one based on the fill factor technique on a fixed Eulerian coordinate system, are used to solve the resin flow through the preform. The comparative analysis of the fill factor and moving front methods as well as the results demonstrating the effect of phase transition and impregnation of individual fiber bundles on macroscopic flow parameters during RTM are presented.

Numerical Modeling of the Flow of Particle-Filled Resin through a Dual Scale Fibrous Media

2015 ◽  
Vol 1099 ◽  
pp. 44-51
Author(s):  
Hind Haji ◽  
Abdelghani Saouab
Keyword(s):  
Retention Mechanism ◽  
Resin Flow ◽  
Liquid Composite Molding ◽  
Mesoscopic Scale ◽  
Fibrous Media ◽  
Composites Manufacturing ◽  
Composite Molding ◽  
Particle Retention ◽  
Flow Through ◽  
Dual Scale

We present numerical simulation of particle filled resin flow through a fibrous media taking into account dual scale porosity in LCM (Liquid Composite Molding) processes. During the flow, a strong interaction between the particle motion and the fluid flow takes place at the porous medium wall or at the fiber bundle surface. A model is developed to describe the particle retention and filtration in the porous media. In this study, the Stokes-Darcy equation is solved to describe the resin flow in a mesoscopic scale. The particle retention mechanism is extensively studied taking into account the influences from such parameters as size and concentration of particles. The particle filled resin flow through a fibrous media simulation is performed to demonstrate the effect on the retention and filtration mechanism during the composites manufacturing by LCM processes.

Compression Resin Transfer Molding Using Inflatable Seals

2021 ◽  
Vol 900 ◽  
pp. 3-8
Author(s):  
Ahmed Ouezgan ◽  
Said Adima ◽  
Aziz Maziri ◽  
El Hassan Mallil ◽  
Jamal Echaabi
Keyword(s):  
Resin Transfer Molding ◽  
Mold Cavity ◽  
Liquid Composite Molding ◽  
Transfer Molding ◽  
Resin Injection ◽  
New Variant ◽  
Filling Time ◽  
Composite Molding ◽  
Fiber Reinforcements ◽  
Compression Resin Transfer Molding

Compression resin transfer molding using inflatable seals is a new variant of LCM (“Liquid composite molding”) processes, which uses the inflatable seals to compress the fiber reinforcements and drive the resin to impregnate the fabric preform, resulting to fill the entire mold cavity. During resin injection, the preform is relaxed. Consequently, the resin enters easily and quickly into the mold cavity. After, the necessary resin is injected into the mold cavity, the compression stage takes place, in a stepwise manner, by swelling the inflatable seals. The objective of this paper is to present this new process and study the effect of the number of inflatable seals on the filling time.

Measurement of Transverse Permeability of Fabric Preforms Using Ultrasound Monitoring Technique in LCM Processes

2011 ◽  
Vol 311-313 ◽  
pp. 214-217 ◽  
Author(s):  
Jin Hua Jiang ◽  
Ze Xing Wang ◽  
Nan Liang Chen
Keyword(s):  
Transverse Direction ◽  
Process Analysis ◽  
Resin Flow ◽  
Liquid Composite Molding ◽  
Permeability Measurement ◽  
Ultrasound Monitoring ◽  
Monitoring Technique ◽  
Transverse Permeability ◽  
Composite Molding ◽  
Flow Through

Processes of the Liquid Composite Molding (LCM) are widely used in composites produced by impregnation of a dry preform with liquid resin. The resin flow through the preform is usually described by Darcy’s law and the permeability tensor must be obtained for filling process analysis and characterizing the ability of a porous material to be impregnated by a resin fluid. In generally, resin flow in the thickness direction can be neglected for thin parts, but the resin flow in the transverse direction is important for thicker parts. In this study, the transverse permeability measurement device using ultrasound method was developed, the transverse flowfront could be calculated, and global effective permeability and transverse were studied.

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

1993 ◽  
Vol 14 (2) ◽  
pp. 144-150 ◽  
Author(s):  
K. Han ◽  
L. Trevino ◽  
L. James Lee ◽  
Ming Liou
Keyword(s):  
Experimental Analysis ◽  
Liquid Composite Molding ◽  
Composite Molding

scholarly journals Modeling the reactive PA6 flow for LCM processes

2021 ◽  
Author(s):  
William Han ◽  
Quentin Govignon ◽  
Arthur Cantarel ◽  
Cédric Samuel ◽  
Fabrice Schmidt
Keyword(s):  
Thermoplastic Composites ◽  
Resin Flow ◽  
Liquid Composite Molding ◽  
Thermoset Composites ◽  
Low Viscosity ◽  
Composite Molding ◽  
Flow Through ◽  
Future Work ◽  
Plate Geometry

Fiber reinforced thermoplastic composites have shown to be attractive for industry as they can be reused, reshaped, welded and repaired, while keeping mechanical properties on par with thermoset composites. Since thermoplastics usually have high melt viscosities unsuitable for liquid composite molding processes, in-situ synthesis of PA6 from ε-caprolactam is considered. Its reactive mix has low viscosity which allows impregnation. However, the coupled crystallization and polymerization affects the resin viscosity and its flow is altered by the dual-scale permeability of the fiber preform. Thus, to predict the local differences in the thermoplastics properties, a coupled polymerization crystallization model needs to be integrated in the LCM processing simulation at representative scales. This study aims to propose a reliable simulation of the resin flow through a fibrous preform. Hence, viscosity measurements on the reactive mix are achieved using a rheometer with parallel-plate geometry, aiming to associate a viscosity model with the Hillier coupled polymerization-crystallization model previously determined by Vicard. The full chemorheological model will then be integrated into a simulation of LCM process in OpenFOAM®, an open source CFD software in order to follow the extent of the synthesis in the resin flow during the process. As a future work, simulations including microscale tow information extracted from a real textile specimen will permit to investigate the effect of permeability and double scale porosity in fibrous preforms on the final polymerization rate and crystallinity.

Simulation of Reactive Liquid Composite Molding

1998 ◽  
Vol 13 (4) ◽  
pp. 389-397 ◽  
Author(s):  
C.-H. Wu ◽  
H.-T. Chiu ◽  
L. J. Lee ◽  
S. Nakamura
Keyword(s):  
Liquid Composite Molding ◽  
Composite Molding ◽  
Reactive Liquid
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