Resin infusion, film

Measurements were taken of e at 3-min time intervals during a resin film infusion (RFI) cure cycle in an autoclave at the Northrup Grumann Corporation Los Angeles plant. The T 

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In situ frequency dependent electromagnetic-impedence measurements provide a sensitive, convenient, automated technique to monitor the changes in macroscopic cure processing properties and the advancement of the reaction in situ in the fabrication tool. This chapter discusses the instrumentation, theory, and several applications of the techniques, including isothermal cure, complex time—temperature cure, resin film infusion, thick laminates, and smart, automated control of the cure process. 

As an example of cure monitoring in resin film infusion, Figure 4.16 shows the output of oje"(oj) from sensor 1 for the MY720 aromatic TGMDA epoxy system commercially sold as 3501-6 by Hercules. 

Zero s use is not restricted to high cost aerospace applications as A P designed the febric to provide affordable but superior performance. It can be used in a wide range of RP molding processes including resin transfer molding (RTM), vacuum assisted RTM (VARTM), resin film infusion, and hand lay-up (Chapter 5). 

A lead adopter, at least among production boat builders, of new resin film infusion materials is the French company Poncin Yachts, which offers hulls laid up in SP Systems Resin Infusion Technology (SPRINT) material. The company could equally have chosen Hexcel Composites HexFit, or another of the several semi- preg products now available on the market. 

In addition to unidirectional panels, four sets of [0/90]7s laminates were prepared using resin film infusion (RFI) molding. In spite of a statistically indistinguishable difference in notched quasistatic compression strength (Fig. 11.5), substantial differences in the fatigue limit were noted between the polyhydroxyether sized material, the polyvinylpyrrolidone sized material and the unsized materials. 

Pre-catalysed resin In sheet form Figure 21.54 Resin film Infusion. Source Reprinted from SP Systems, Newport, lOW, technical data, with kind... 

Resin film infusion (RFI), where dry fibres are laid up interleaved with layers of semi-solid resin film supplied on a release paper. The lay-up is vacuum bagged to remove the air through the dry fabrics and then heated to allow the resin to first melt and flow into the air-free fabrics, and then to cure. 

Various processes, such as RTM (resin transfer molding), VARTM (vacuum-assisted resin transfer molding), and RFl (resin film infusion) can be used to make composite parts. 

There are other variations of the RTM, VARTM and CRTM process which belong to the class of LCM processes such as RTM light in which a caul plate is introduced on top of the bag, resin infusion under flexible tooling (RIFT), resin film infusion (RFI) and vacuum injection preform relaxation (VIPR). In addition many of the same processes are known by different acronyms. It is useful to note that as the science base of RTM improved and led to better understanding of the variables and parameters that influence the flow and dry spot creation in RTM, it led to approaches and creative ideas to improve the process and cut down the cost. This learning continues today to evolve new modifications to the LCM family of processes. For example in VIPR one can now introduce flow control effectively to modify the flow front and create a part that is better than the SCRIMP process and is of consistent quality. ... 

Multiaxial prepreg Autoclave resin film infusion 0.31 0.60... 

D noncrimp fabric Resin film infusion resin transfer molding 0.30 0.55... 

Garschke C, Weimer C, Parlevliet P Fox B (2012), Out-of-autoclave cure cycle study of a resin film infusion process using in situ process monitoring . Composites A, 43, 935-944... 

Park J, Kang M K (2003) A numerical simulation of the resin film infusion process, Compos Struc 60 431-437,... 

Antonucci V, Giordano M, Nicolais L, Calabrd A, Cusano A, Cutolo A, Inserra S (2003) Resin flow monitoring in resin film infusion process, J Mater Proc Technol 143-144 687-692,... 

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