scholarly journals Void Formation in Geometry-Anisotropic Woven Fabrics in Resin Transfer Molding

2014 ◽  
Vol 40 (2) ◽  
pp. 62-70 ◽  
Author(s):  
Ryosuke MATSUZAKI ◽  
Daigo SETO ◽  
Akira TODOROKI ◽  
Yoshihiro MIZUTANI
Keyword(s):  
Resin Transfer Molding ◽  
Void Formation ◽  
Woven Fabrics ◽  
Transfer Molding

Void formation in geometry–anisotropic woven fabrics in resin transfer molding

2013 ◽  
Vol 23 (2) ◽  
pp. 99-114 ◽  
Author(s):  
Ryosuke Matsuzaki ◽  
Daigo Seto ◽  
Akira Todoroki ◽  
Yoshihiro Mizutani
Keyword(s):  
Resin Transfer Molding ◽  
Void Formation ◽  
Woven Fabrics ◽  
Transfer Molding

Analytical prediction of void formation in geometrically anisotropic woven fabrics during resin transfer molding

2015 ◽  
Vol 107 ◽  
pp. 154-161 ◽  
Author(s):  
Ryosuke Matuzaki ◽  
Daigo Seto ◽  
Masaki Naito ◽  
Akira Todoroki ◽  
Yoshihiro Mizutani
Keyword(s):  
Resin Transfer Molding ◽  
Void Formation ◽  
Woven Fabrics ◽  
Analytical Prediction ◽  
Transfer Molding

scholarly journals Examination of Void Formation Mechanism by Numerical Analysis

1997 ◽  
Vol 6 (1) ◽  
pp. 096369359700600
Author(s):  
Naoto Ikegawa ◽  
Hiroyuki Hamada ◽  
Zenichiro Maekawa
Keyword(s):  
Finite Element Method ◽  
Porous Medium ◽  
Numerical Analysis ◽  
Formation Mechanism ◽  
Flow Resistance ◽  
Flow Behavior ◽  
Resin Transfer Molding ◽  
Void Formation ◽  
Homogenization Method ◽  
Transfer Molding

In order to analyze flow behavior of resin in the system with porous medium such as fibrous reinforcement for Structural Resin Transfer Molding (SRTM), equivalent viscosity according to a concept of homogenization method was introduced as an index of flow resistance. Numerical analysis using finite element method (FEM) was performed to clarify the void formation mechanism.

Gate optimization for resin transfer molding in dual-scale porous media: Numerical simulation and experiment measurement

2019 ◽  
Vol 54 (16) ◽  
pp. 2131-2145
Author(s):  
Yutaka Oya ◽  
Tsubasa Matsumiya ◽  
Akira Ito ◽  
Ryosuke Matsuzaki ◽  
Tomonaga Okabe
Keyword(s):  
Resin Transfer Molding ◽  
Void Formation ◽  
Weld Line ◽  
Woven Fabric ◽  
Design Rule ◽  
Self Organizing Maps ◽  
Transfer Molding ◽  
Multi Objective ◽  
Filling Simulation ◽  
Visualization Techniques

For resin transfer molding in a woven fabric, this study developed a novel framework for optimization by combining a multi-objective genetic algorithm and mold-filling simulation including a void-formation model, which gives us not only the spatial distribution of the mesoscopic and microscopic voids but also the correlations between molding characteristics such as fill time, total amount of void, weld line, and wasted resin. Our experiment observation of one-point radial injection successfully captured the anisotropic distribution of mesoscopic voids, which qualitatively validates the simulated result. As a result of multi-objective optimization for an arrangement of two injection positions, we found the trade-off relations of weld line with the other characteristics, which also have positive correlation with each other. Furthermore, visualization techniques such as self-organizing maps and parallel coordinate maps extracted the design rule of the arrangement. For example, a diagonal gate arrangement with an appropriate distance is required for reducing the both total amount of voids, fill time, and wasted resin; however, the total area of the weld line becomes relatively large. Our framework and the knowledge obtained from this study will enable us to determine the appropriate mold design for resin transfer molding.

A Study on Resin Flow through a Multi-layered Preform in Resin Transfer Molding

2002 ◽  
Vol 10 (7) ◽  
pp. 493-510 ◽  
Author(s):  
D. G. Seong ◽  
K Chung ◽  
T. J. Kang ◽  
J. R. Youn
Keyword(s):  
Resin Transfer Molding ◽  
Mold Filling ◽  
Transverse Flow ◽  
Woven Fabrics ◽  
Weighted Averaging ◽  
Resin Flow ◽  
Flow Front ◽  
Transfer Molding ◽  
Filling Time ◽  
Flow Through

In resin transfer molding, mold filling is governed by the flow of resin through a preform which is considered as an anisotropic porous media. The resin flow is usually described by Darcy's law and the permeability tensor must be obtained for filling analysis. When the preform is composed of more than two layers with different in-plane permeability, effective average permeability should be determined for the flow analysis in the mold. The most frequently used averaging scheme is the weighted averaging scheme, but it does not account for the transverse flow between adjacent layers. A new averaging scheme is suggested to predict the effective average permeability of the multi-layered preform, which accounts for the transverse flow effect. When the flow in the mold is unsaturated, the effective average permeability is predicted by using the predicted mold filling time and transverse permeability. The new scheme is verified by measuring the effective permeability of the multi-layered preforms which consist of glass fiber random mats, carbon fiber woven fabrics, aramid fiber woven fabrics. Fluid flow through the preform composed of more than two layers with different in-plane permeability shows different flow fronts between layers. The difference in the flow front advancement is observed with a digital camcorder. The predicted flow front is compared with the experimental results and shows a good agreement. It is expected that the effective average permeability can be used for modeling the resin flow through the multi-layered preform.

Optical Measurement of Preform Impregnation in Resin Transfer Molding

1993 ◽  
Vol 305 ◽  
Author(s):  
Thomas Nowak ◽  
Jung-Hoon Chun
Keyword(s):  
High Performance ◽  
Optical Measurement ◽  
Resin Transfer Molding ◽  
Void Formation ◽  
Woven Fabric ◽  
Void Content ◽  
Trade Off ◽  
Transfer Molding ◽  
Scale Models ◽  
Visualization Experiments

AbstractInfiltration of preforms used to manufacture high-performance, advanced polymer composites can lead to void formation due to inhomogeneities within the preforms. Void formation occurs at three distinct length scales: the fiber, tow and part scales. Flow visualization experiments were used to characterize void formation at the tow and fiber scales. Effects of tow-scale inhomogeneities were studied by varying the warp angle of a woven fabric. Effects of fiber-scale inhomogeneities were studied using scale models of typical tows. The experiments indicate that minimization of void content requires a trade-off between fiberscale and tow-scale void formation.

Study on void formation in resin transfer molding

1998 ◽  
Vol 38 (5) ◽  
pp. 809-818 ◽  
Author(s):  
Chih-Yuan Chang ◽  
Lih-Wu Hourng
Keyword(s):  
Resin Transfer Molding ◽  
Void Formation ◽  
Transfer Molding
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