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prepreg plies

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.omfrc.t53030137
EISBN: 978-1-62708-349-2
... performance. This chapter describes the optical microscopy and bright-field illumination techniques involved in analyzing ply terminations, prepreg plies, splices, and fiber orientation to provide the insight necessary for optimizing composite structure and performance. composites fiber orientation...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.omfrc.t53030223
EISBN: 978-1-62708-349-2
... of the prepreg between adjacent plies and on the tooling used for manufacture ( Ref 4 to 6 ). The development and degree of core crush has been documented and successfully measured for different material combinations ( Ref 7 ). Figure 13.2 ( a to c ) includes micrographs of areas in a honeycomb sandwich...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.omfrc.t53030147
EISBN: 978-1-62708-349-2
... part using prepreg materials, air may be entrapped between the adjacent plies, resulting in voids in the cured structure ( Ref 11 , 12 ). The quantity and location of the voids depends on many factors, including the tack, prepreg impregnation, surface morphology, lay-up and nesting, thickness of lay...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.omfrc.t53030067
EISBN: 978-1-62708-349-2
...) or staged prepreg plies are cut with sharp scissors and bonded together. The width of the overall sample, made from multiple plies of prepreg, that is in contact with the platen surface should be between 12.7 and 19 mm (0.5 and 0.75 in.) thick. The length of the prepreg should optimally be less than 50.8 mm...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.omfrc.t53030001
EISBN: 978-1-62708-349-2
...-melt impregnation of the matrix resin into the continuous unidirectional or woven fiber fabric materials ( Ref 5 , 6 ). These pre-engineered laminating materials have a discrete resin/fiber ratio that requires further lay-up of the continuous fiber plies to achieve the final composite. The prepreg lay...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.omfrc.9781627083492
EISBN: 978-1-62708-349-2
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870201
EISBN: 978-1-62708-314-0
... in matched metal tools. In order to get the lay-up to fit within these tools, the plies, or ply packs, either have to be hot debulked if the material is a net resin content prepreg or prebled to remove resin and compact the lay-up if the material is an excess resin content prepreg. These two factors, namely...
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
... moisture absorption/desorption computer programs to determine the appropriate drying time. The drying operation can often be combined with a trial run of the repair process by substituting dry glass cloth for the prepreg plies and bagging in the same manner as for the actual patch cure. This trial run...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.omfrc.t53030089
EISBN: 978-1-62708-349-2
... facets that are usually investigated using reflected-light bright-field illumination. Shown in the cross section are voids (dark areas), ply terminations (i.e., ply drops), carbon fiber plies having different thicknesses, different prepreg material combinations (glass fabric prepreg and carbon fiber...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870119
EISBN: 978-1-62708-314-0
... to mix the resin, impregnate the dry plies, and then roll out air and excess resin. As for wet lay-up, the main driver for using LTVB materials is the ability to make large parts with minimal tooling investment. These prepregs have been successfully used in a number of low-rate-prototype aerospace...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870063
EISBN: 978-1-62708-314-0
... , 1983 , p 3 – 14 10.1520/STP28535S 7. Carpenter J.F. , Assessment of Composite Starting Materials: Physiochemical Quality Control of Prepregs , AIAA/ASME Symposium on Aircraft Composites: The Emerging Methodology for Structural Assurance , San Diego, CA , 24–25 March 1977 10.2514...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870489
EISBN: 978-1-62708-314-0
... orientations and number of plies needed to meet strength and stiffness requirements; the designer took overall responsibility for the design, consulting with the proper engineering group when there was a technical question. Today’s design environment is totally different. Designs are now created...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 October 2012
DOI: 10.31399/asm.tb.lmub.t53550385
EISBN: 978-1-62708-307-2
..., and high-temperature and corrosion behaviors are determined by the orientation, shape, and spacing of fibers, the number of plies, resin properties, and consolidation and forming methods. The chapter also covers secondary fabrication processes, such as thermoforming, machining, and joining, as well...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870183
EISBN: 978-1-62708-314-0
... factors during forming. Resin percolation is the flow of the viscous polymer through or along the fiber bed that allows the plies to bond together, while transverse squeeze flow eliminates slight variations in prepreg thickness by allowing the prepreg layers to spread laterally due to applied pressure...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870373
EISBN: 978-1-62708-314-0
..., which are useful for comparing material systems but not for determining overall structural performance since purely unidirectional composites are almost never used in real applications; they must be cross-plied to accept loads in several directions; and (2) mechanical properties are very dependent...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2011
DOI: 10.31399/asm.tb.cfw.t52860065
EISBN: 978-1-62708-338-6
... deform the mandrel during winding and/or cure. However, the resin, if wet, may flow during heated cure and could end up all at one end, if proper precautions are not taken. Typical use involves prepregs rather than wet winding. The following describes one approach to fabrication via a vertical machine...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870255
EISBN: 978-1-62708-314-0
... and heat resistance. They can be thermoformed to contours and are capable of withstanding autoclave curing with prepregs. These foams are expensive and are usually reserved for high-performance aerospace applications. 9.3.1 Syntactic Core Cocuring is a process in which uncured composite plies...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2011
DOI: 10.31399/asm.tb.cfw.t52860095
EISBN: 978-1-62708-338-6
... of variation is greater than the mean value; in some cases, the models were all judged to be relatively equivalent. Unidirectional prepreg and prepreg tow of T-650-35/1902 were fabricated by Jensen et al. ( Ref 8.19 ) as several angle plies, both as hand-laidup flat specimens and as tubular filament-wound...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2005
DOI: 10.31399/asm.tb.mmfi.t69540319
EISBN: 978-1-62708-309-6
.... The ability to tailor a laminate, by adding plies in the directions most needed and leaving them out elsewhere, greatly contributes to the efficiency of advanced composite structures. Other than the ply properties themselves, the orientation and percentage of plies are the major design variables affecting...
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
... surface. If the part were constant in thickness or contained little thickness variation, then it might have been more sensible to tool it to the OML surface. Ease of part fabrication is another tooling concern. Depending on part geometry, it may be easier to lay up the plies on a particular surface...