Prepreg, tape and fabric technology for advanced composites

Molyneux, M.; Murray, Patrick; Murray, Both P.

doi:10.1016/s0010-4361(83)80003-2

Cited by 37 publications

(19 citation statements)

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“…Vacuum bag only (VBO) processing of prepregs, in particular, is an appealing out-of-autoclave technique for high-performance applications. Advantages of prepreg over other OoA methods such as infusion or resin transfer molding include the capacity to use higher-performance and higher viscosity resins and incorporate modifiers, as well as the ability to precisely control fiber alignment and fiber volume fraction [1][2][3]. Additionally, VBO processing of prepregs utilizes many of the same protocols and consumables as autoclave manufacturing, but enables the use of lower pressures and temperatures during cure, allowing for the use of inexpensive tooling and flexible curing environments [4,5].…”

Section: Introductionmentioning

confidence: 99%

Effect of prepreg format on defect control in out-of-autoclave processing

Grunenfelder

Dills

Centea

2017

Composites Part A: Applied Science and Manufacturing

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Prepreg format plays a key role in part quality for composites produced using vacuum bag only (VBO) techniques. To date, however, VBO prepregs have been produced by modifying existing autoclave formats. In this work, we introduce USCpreg, a prepreg format designed specifically for out-of-autoclave cure, featuring through-thickness permeability. We describe the fabrication and analysis of laminates processed with USCpreg, as well as laminates fabricated from traditional VBO prepreg formats. The through-thickness pathways for air transport in USCpreg result in near-zero internal porosity and defect-free surfaces in parts cured under VBO conditions, even under challenging processing conditions. Results highlight the fact that surface and internal porosity depend on prepreg format, and that through-thickness permeability is critical to achieving high quality parts in non-ideal manufacturing scenarios.

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Section: Introductionmentioning

confidence: 99%

Effect of prepreg format on defect control in out-of-autoclave processing

Grunenfelder

Dills

Centea

2017

Composites Part A: Applied Science and Manufacturing

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“…. Prepregs have become accepted wherever performance, material qualification, and product consistency are the prime requirements for many industrial applications like aerospace, defence, marine, offshore, and renewable energy sectors . The factors which can distinguish prepregs from other composite forms are precise combination of resin and reinforcements prior to the molding process, high accurate resin impregnations to ensure uniformity and consistency, analyzing chemical issues and resolve them at early stages of product making i.e., before the molding processes, and highly suitable material for safety concerns due to low‐risk in terms of handling hazards, and zero volatile emissions.…”

Section: Introductionmentioning

confidence: 99%

Mechanical characterization and fractography of glass fiber/polyamide (PA6) composites

et al. 2014

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The mechanical properties of the glass fiber reinforced Polyamide (PA6) composites made by prepreg tapes and commingled yarns were studied by in-plane compression, short-beam shear, and flexural tests. The composites were fabricated with different fiber volume contents (prepregs-47%, 55%, 60%, and commingled-48%, 48%, 49%, respectively) by using vacuum consolidation technique. To evaluate laminate quality in terms of fiber wet-out at filament level, homogeneity of fiber/matrix distribution, and matrix/ fiber bonding standard microscopic methods like optical microscopy and scanning electron microscopy (SEM) were used. Both commingled and prepreg glass fiber/PA6 composites (with V f 48%) give mechanical properties such as compression strength (530-570 MPa), inter-laminar shear strength (70-80 MPa), and transverse strength (80-90 MPa). By increasing small percentage in the fiber content show significant rise in compression strength, slight decrease in the ILSS and transverse strengths, whereas semipreg give very poor properties with the slight increase in fiber content. Overall comparison of mechanical properties indicates commingled glass fiber/PA6 composite shows much better performance compared with prepregs due to uniform distribution of fiber and matrix, better meltimpregnation while processing, perfect alignment of glass fibers in the composite. This study proves again that the presence of voids and poor interface bonding between matrix/fiber leads to decrease in the mechanical properties. Fractographic characterization of postfailure surfaces reveals information about the cause and sequence of failure. POLYM. COMPOS., 00:000-000,

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“…1 However, these composites do not come without disadvantages. Residual stresses resulting from cure-induced or thermally induced differential volume changes between the resin and filler can lead to deteriorated performance and premature failure of these materials.…”

Section: Introductionmentioning

confidence: 99%

Viscoelastic properties and residual stresses in polyhedral oligomeric silsesquioxane‐reinforced epoxy matrices

Hutcheson

McKenna

et al. 2008

J Polym Sci B Polym Phys

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Fiber-filled thermosetting polymer composites are extensively used in aerospace industries. One disadvantage of these materials is cure induced or thermally induced residual stresses in the matrix, which may result in deteriorated performance and premature failure. This article explores the use of epoxy/multifunctional polyhedral oligomeric silsesquioxane (POSS) nanocomposites as resins with reduced thermal stress coefficients that result in mitigated residual stresses. The effect of POSS loading on the thermal stress coefficient of the epoxy/POSS nanocomposite resins was investigated from below the b-relaxation to the a-relaxation, or glass transition temperature, (i.e., from À100 to 180 C) by measuring the shear modulus and linear thermal expansion coefficient. The thermal stress coefficient of the epoxy/POSS nanocomposites is found to be a strong function of temperature, decreasing rapidly with decreasing temperature through the a-relaxation region, increasing in the vicinity of the b-relaxation, and then decreasing below the temperature associated with the peak in the b-relaxation. With increasing POSS content, the thermal stress coefficient is reduced compared with the neat resin in the vicinity of the a-relaxation; however, the thermal stress coefficient increases with increasing POSS content below the temperature of the b-relaxation peak.

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Prepreg, tape and fabric technology for advanced composites

Cited by 37 publications

References 0 publications

Effect of prepreg format on defect control in out-of-autoclave processing

Effect of prepreg format on defect control in out-of-autoclave processing

Mechanical characterization and fractography of glass fiber/polyamide (PA6) composites

Viscoelastic properties and residual stresses in polyhedral oligomeric silsesquioxane‐reinforced epoxy matrices

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