Effect of Process Variables on the Quality of Compression Resin Transfer Molding

Chang, Chih-Yuan; Hourng, Lih‐Wu; Chou, Tai‐Li

doi:10.1177/0731684406064997

Cited by 28 publications

(22 citation statements)

References 10 publications

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“…As expected, a higher vacuum makes a better quality part, due to the less formed voids [1 -5] . A high mold cavity can reduce the resin flow resistance offered by the preform and be favorable for the resin penetration into the interstices of the preform [19] . However, it is not necessarily appropriate to use an excessively high mold cavity, since the C 1 is slightly less than C 2 in η .…”

Section: Figurementioning

confidence: 99%

“…Many studies have been done to analyze the liquid flow, heat transfer and required clamping force [9 -17] . Investigations of the mechanical properties of the CRTM part are given in [18,19] . A new process, based on the separation and para llelization of the process steps " impregnation " and " forming and curing " , was also developed, to manufacture the parts with a high fiber volume fraction [20] .…”

Section: Introductionmentioning

confidence: 99%

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Unsaturated polyester/E-glass fiber composites made by vacuum assisted compression resin transfer molding

Chang¹,

Lin²

2012

Journal of Polymer Engineering

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A variant process incorporating the method of bag compression into resin transfer molding (RTM), called vacuum assisted compression RTM (VACRTM), has been developed to reduce the cycling period and improve the quality of the part. The process utilizes a flexible bag placed between the upper mold and the preform compared with RTM. By controlling the stretchable bag, the resin is easily introduced into the cavity filled with a loose preform. Then, ambient pressure is applied on the bag that compacts the preform and drives the resin through the remaining dry preform. The objective of this research is to explore the simplified VACRTM feasibility and investigate the effects of process variables, including resin temperature, resin infusion pressure, mold cavity height and cure temperature, on the mechanical strength of the part, by applying Taguchi ' s method. The results show that VACRTM has advantages in terms of its being an easy and good seal among mold parts and the the lack of a need to clean the upper mold. The resin infusion pressure is a significant variable for improvement of the mechanical strength of the part. Optimal VACRTM reduces the filling time by 58 % and increases the flexural strength by 10 % , as compared with typical vacuum assisted RTM (VARTM).

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Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Unsaturated polyester/E-glass fiber composites made by vacuum assisted compression resin transfer molding

Chang¹,

Lin²

2012

Journal of Polymer Engineering

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“…However, the mold is more expensive due to a sophisticated sealing system [68, 116,117]. Process optimization of the numerous process parameters has been done by means of modeling of all process stages [116,118,119].…”

Section: Compression Resin Transfer Molding (Crtm)mentioning

confidence: 99%

Manufacturing and Processing of Polymer Composites

Schuster¹,

Duhovic²,

Bhattacharyya³

2012

Synthetic Polymer-Polymer Composites

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“…No major difference could be identified for the two sets of flexural strength for both RTM and CTM processes. Chang et al [15] investigated the effects of process variables, including injection pressure, mold opening distance, resin temperature, compression pressure, pre-heated mold temperature and cure temperature, on the quality of CRTM products by applying Taguchi's method. They reported that the compression pressure and the resin temperature are significant variables for improvements in the mechanical properties of the part.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Compression Effect on Filling Process in Compression Resin Transfer Molding

Chang

2011

Advanced Composite Materials

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The compression resin transfer molding (CRTM) filling process involves two stages: the injection phase and the compression phase. Two injection modes are considered -constant volumetric flow rate and constant pressure -while the constant compression velocity is utilized in this study. Three typical cases are used to investigate the compression initiation effects on the filling process. When the inlet condition is a constant flow rate, the numerical results show that the compression has both increase and decrease effects on the inlet pressure. Thus, a discontinuity in the inlet pressure is present at the onset or the end of compression. Among three CRTM cases, the process with a simultaneous injection and compression end maximally reduces the inlet pressure by 80% but increases the mold filling time by 65% compared with the resin transfer molding (RTM). For the inlet condition being a constant pressure, the resin may flow out of the mold cavity through the inlet when an excessively low injection pressure and high compression speed are applied concurrently. Compared with RTM, the CRTM processes reduce the mold filling time by 68-76% but cannot ensure a reduction in inlet pressure.

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Effect of Process Variables on the Quality of Compression Resin Transfer Molding

Cited by 28 publications

References 10 publications

Unsaturated polyester/E-glass fiber composites made by vacuum assisted compression resin transfer molding

Unsaturated polyester/E-glass fiber composites made by vacuum assisted compression resin transfer molding

Manufacturing and Processing of Polymer Composites

Simulation of Compression Effect on Filling Process in Compression Resin Transfer Molding

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