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vacuum bags

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Published: 01 November 2010
Fig. 5.19 Low-temperature vacuum bag (LTVB) bagging schematic. Source: Ref 5 More
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Published: 01 November 2010
Fig. 5.12 Typical vacuum-bagging schematic More
Image
Published: 01 November 2010
Fig. 5.17 Notional cure cycle for low-temperature curing/vacuum bag prepreg parts More
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Published: 01 November 2010
Fig. 5.18 Low-temperature vacuum bag (LTVB) cured laminate. Source: Ref 5 More
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Published: 01 November 2010
Fig. 6.3 Typical vacuum bag configuration More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870119
EISBN: 978-1-62708-314-0
... Abstract This chapter familiarizes readers with the many and varied thermoset composite fabrication processes and the types of applications for which they were developed. It describes wet lay-up, prepreg lay-up, and low-temperature vacuum bag curing prepreg processes, which are best suited...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870517
EISBN: 978-1-62708-314-0
... made of prepreg, wet lay-ups, precured composites, or thin titanium sheets adhesively bonded together. Since field repairs are conducted with only vacuum bag pressure (≤14.7 psia or less), the quality of the repair is not as high as that of the original laminate, which was cured in an autoclave at 100...
Image
Published: 01 October 2012
Fig. 8.38 Principle of autoclave curing. The autoclave vessel is pressurized with gas, usually nitrogen or carbon dioxide, at some pressure (e.g., 690 kPa, or 100 psi). Because the laminate inside the vacuum bag is either at atmospheric pressure or has an applied vacuum, there exists More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870101
EISBN: 978-1-62708-314-0
... be placed on a large, flat aluminum project plate. This plate is then covered with a single vacuum bag for cure, a considerable cost savings compared to bagging each individual part. Another application for aluminum tools is matched-die tooling, where all surfaces are tooled, as shown for the spar in Fig...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550385
EISBN: 978-1-62708-307-2
... prepregs (<93 °C, or 200 °F) that could be cured under only vacuum bag pressure. The driver for this development was the need to be able to produce small numbers of parts without large expenditures for expensive autoclave-hardened tooling. Initially, the same prepregs that were being used to produce...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870235
EISBN: 978-1-62708-314-0
... in reducing air entrapment is to stage and emboss the adhesive, as shown in Fig. 8.14 . This can be done by placing the film adhesive on a flat plate, then covering it with a layer of polytetrafluoroethylene (PTFE) film. A section of honeycomb core is then placed on top of the PTFE film and a vacuum bag...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870373
EISBN: 978-1-62708-314-0
... and fabric prepreg that can be vacuum bag or autoclave molded. Again, E-glass, being fairly low in cost, is the most prevalent product form. For demanding aerospace applications, the higher-cost S-2 glass can be used. As shown in Table 14.8 , S-2 glass provides both higher strengths and stiffnesses...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870201
EISBN: 978-1-62708-314-0
... the top of a dam, the result can be a localized low-pressure area along the edge of the laminate that will experience voids or possibly even large delaminations. Finally, if the outer vacuum bag (usually nylon film) bridges and ruptures during the autoclave cycle, a partial or total loss of the compaction...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870489
EISBN: 978-1-62708-314-0
... into a special gun that chops the fibers into short lengths and simultaneously mixes them with either a polyester or a vinyl ester resin that is then sprayed onto the tool. Manual compaction with rollers is used to compact the lay-up. Vacuum bag cures can be used to improve part quality, but this is not common...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2001
DOI: 10.31399/asm.tb.aub.t61170550
EISBN: 978-1-62708-297-6
..., 30% Cu, 28% Zn, 2% Sn). For the brazing of stainless steel, the nickel-bearing alloy BAg-3 (UNS P07501 with 50% Ag, 15% Cu, 16% Zn, 16% Cd, 3% Ni) is most commonly used, but many other silver-base brazing alloys are applicable as well. Vacuum brazing grades, BVAg-x, are also available. These filler...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870183
EISBN: 978-1-62708-314-0
..., the actual cycle time to heat and cool large tools is normally in the range of 5 to 15 hours. In spite of all of these disadvantages, autoclaves have a place in thermoplastic composite part fabrication for parts that are too complex to make by other methods. Fig. 6.3 Typical vacuum bag configuration...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870573
EISBN: 978-1-62708-314-0
... at the attachment locations. The part is vacuum bagged and autoclave cured at 300 °F (150 °C) for eight hours. The cured part is rough trimmed, x-rayed, and ultrasonically inspected. The part is then postcured by placing it in a graphite restraining fixture, loading it into a furnace, and heating it to 500 °F (260...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230401
EISBN: 978-1-62708-298-3
.... Furthermore, improper surface preparation and/or contamination during the welding process may also adversely affect the weldability. Fusion welding is limited to methods where either a vacuum or complete shielding from the ambient atmosphere is used. Welding operations should be designed to minimize heat...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.cfap.t69780064
EISBN: 978-1-62708-281-5
... n n n y y     Prepreg 0.5–5 0.07–0.75 30 3370 6.0 65 y n n y n n n n y y     Vacuum bag 0.1 0.015 n/a n/a … … n n y y n y n n n y Hand lay-up 0 0 n/a n/a … … n n y y n y n n n y Injection     Powder 100 14.5 10 1120 0.1 1.1 y...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870333
EISBN: 978-1-62708-314-0
... parameters along the length of the structure. A summary of some of the defects detected by x-ray in honeycomb bonded assemblies is shown in Fig. 12.13 . Blown core is usually caused by a vacuum bag leak during bonding. Small leaks can result in small areas of blown core, while large leaks, for example...