Characterization of membranes used in pressure driven composite processing

Amouroux, Solange C.; Heider, Dirk; Gillespie, John W.

doi:10.1016/j.compositesa.2009.10.014

Cited by 9 publications

(10 citation statements)

References 24 publications

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“…The confluence of flow fronts is not critical in this process, and therefore, no additional vent ports have to be provided, which are the last to be reached by the flow front in other infusion processes. 11,12 An autoclave is used for the production of wing covers for the Airbus A220 (formerly Bombardier Cseries). The patent for the resin transfer infusion (RTI) process, published in 1998, shows that a bagging blanket with stiffened and soft areas is used (see Figure 3).…”

Section: Overview Of Infusion Processesmentioning

confidence: 99%

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Experimental investigation of a method to avoid channel marks during vacuum infusion

Hindersmann

2019

Journal of Composite Materials

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Today the impregnation of dry fibre materials is a production method preferred for large composite parts like wind turbine rotor blades or aircraft wing covers. One of the recurring problems of the production process is that the used resin distribution channels leave marks on the surface of the part. The result of the marks in the channel area is a localized deformation of the fibre material, and hence the laminate becomes more prone to shear buckling in this area. The purpose of this paper is to present a report on an unconventional infusion method to avoid channel marks on composite part's surfaces. The channels can be activated by a pressure difference. If the channels are deactivated during a specific process window no channel marks will be left on the part's surface. In order to verify the inexistence of channel marks, three analytical processes are used.

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Section: Overview Of Infusion Processesmentioning

confidence: 99%

Section: State-of-the-art Infusion Processesmentioning

confidence: 99%

Experimental investigation of a method to avoid channel marks during vacuum infusion

Hindersmann

2019

Journal of Composite Materials

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“…If contaminated with the catalyzed resin, vacuum lines are either to be flushed with solvent or thrown away in ease. On the other hand, a pressure gradient that develops during infusion process causes a thickness gradient across the part, which adversely influences the fiber volume fraction variation across the part [3][4][5]. CVIP remains therefore vastly lacking in terms of the required part quality for advanced composite applications.…”

Section: Introductionmentioning

confidence: 99%

“…CVIP remains therefore vastly lacking in terms of the required part quality for advanced composite applications. In order to enhance the repeatability of the part characteristics, CVIP has been recently modified with a gas-permeable membrane, a thin, flexible film or fabric typically made from either polytetrafluoroethylene (PTFE) or thermoplastic polyurethane (TPU), that permits uniform vacuum distribution during infusion [3][4]. These types of membranes have been privileged as potential pathways to easy, repeatable, and high-quality vacuum infusion.…”

Section: Introductionmentioning

confidence: 99%

“…These types of membranes have been privileged as potential pathways to easy, repeatable, and high-quality vacuum infusion. It was recommended that they be used as an additional layer in all or some parts of the fabric preform, thus bringing up a full vacuum gradient combined with a continued degassing across the part surface during process [3][4][5][6]. This feature enables MAVIP to be superior over CVIP where the vacuum is applied just at one end-edge of the part.…”

Section: Introductionmentioning

confidence: 99%

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Evaluating addition of a membrane layer in vacuum infusion processing of fiber reinforced epoxy composites in terms of flexural properties and void content

Seyhan¹

2017

ANADOLU UNIVERSITY JOURNAL OF SCIENCE AND TECHNOLOGY a - Applied Sciences and Engineering

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The effect of addition of a membrane layer in vacuum infusion process was investigated with emphasis being placed on the flexural properties and void content of the resulting composites. E-glass fiber and epoxy were, respectively, used as filler and matrix constituents to produce the composites. Conducting a facile TGA based methodology, fiber volume fraction, density, and void content measurements were carried out on the samples taken from different zones across the composite parts. Despite giving rise to the composite thickness, 16 % high compared to the part thickness produced by vacuum infusion without any membrane, infusion with incorporation of the membrane layer resulted in a relatively high composite fiber volume fraction with reduced void content at no expense of compaction. At the vacuum port, flexural strength and modulus values of the composites produced by membrane added vacuum infusion process (MAVIP) were found to be, respectively, 11 and 8 % higher than those of the composites produced by conventional vacuum infusion process (CVIP). On the other hand, at the inlet port, composites produced by MAVIP exhibited 12 and 9 % high flexural strength and modulus values compared to those produced by CVIP. Moreover, the load-deflection response (P/) of the samples taken from different zones along the parts was correlated with respect to their length-to-width aspect ratio (L/b) based on the plane strain analytical approach. Once L/b aspect ratio was greater than 6.5, plane strain approach was found to converge to more definite beam modulus values, regardless of the process used.

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Resin Infusion Under Flexible Tooling ( RIFT )

Summerscales

2012

Wiley Encyclopedia of Composites

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The traditional processes for the manufacture of high performance composite shell structures are (i) vacuum bagging (VB)/VB with autoclave cure VB(A), (ii) resin transfer molding (RTM), and (iii) compression molding. Over recent years, there have been a number of novel “infusion” processes introduced, which span the gap between VB(A) and RTM. The new processes are known by a confusing set of names or acronyms—each company uses a distinct name, yet often the processes are near identical. The infusion processes can be mapped onto four distinct generic processes: Resin infusion in the plane of the fabric (Type I), Resin infusion with a flow medium/transport or distribution mesh (Type II), Resin film infusion (Type III), and Semipreg techniques (Type IV). This article describes the attributes of each of the four variants above and considers their relative advantages and issues.

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Characterization of membranes used in pressure driven composite processing

Cited by 9 publications

References 24 publications

Experimental investigation of a method to avoid channel marks during vacuum infusion

Experimental investigation of a method to avoid channel marks during vacuum infusion

Evaluating addition of a membrane layer in vacuum infusion processing of fiber reinforced epoxy composites in terms of flexural properties and void content

Resin Infusion Under Flexible Tooling ( RIFT )

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