Influence from process parameters on void formation in resin transfer molding

1994 ◽  
Vol 15 (1) ◽  
pp. 25-33 ◽  
Author(s):  
T. Staffan Lundström ◽  
B. Rikard Gebart
Keyword(s):  
Process Parameters ◽  
Resin Transfer Molding ◽  
Void Formation ◽  
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

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.

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

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.

scholarly journals Optimizing Bladder Resin Transfer Molding Process to Manufacture Complex, Thin-Ply Thermoplastic Tubular Composite Structures: An Experimental Case Study

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4093
Author(s):  
Somen K. Bhudolia ◽  
Pavel Perrotey ◽  
Goram Gohel ◽  
Sunil C. Joshi ◽  
Pierre Gerard ◽  
...  
Keyword(s):  
Process Parameters ◽  
Composite Structures ◽  
Resin Transfer Molding ◽  
Low Permeability ◽  
Molding Process ◽  
Mechanical Fracture ◽  
Transfer Molding ◽  
Injection Process ◽  
Liquid Injection

The bladder molding process is primarily used in sporting applications but mostly with prepregs. Bladder-Assisted Resin Transfer Molding (B-RTM) presents the tremendous potential to automate and mass produce the complex hollow-composite profiles. Thin-ply, non-crimp fabrics (NCFs) provide excellent mechanical, fracture toughness, and vibration damping properties on top of the weight saving it offers to a final product. However, these fiber architectures are difficult to inject due to the resistance they provide for the polymer flow using the liquid injection process. Therefore, it is mandatory to optimize the process parameters to reduce the time for injection and simultaneously achieve better consolidation. This work presents a first, detailed, experimental case study to successfully inject a low-permeability, thin-ply, complex, thermoplastic tubular structure, and the effect of process parameters, boundary conditions, the associated manufacturing challenges, and proposed solutions are deliberated in this paper.

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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