Documents published in Scipedia

• Dry carbon fiber applications in aerospace sector and automation options

  A. Gandarias, H. Gutierrez, J. Nuñez

  Materiales Compuestos (2022). Vol. 03 - Comunicaciones Matcomp17 (2019), (Núm. 3 - Procesos de Fabricación II y Materiales Avanzados), 5

  
  

  Abstract

  Considering the latest introduction of the dry multiaxial fabrics into Aeronautical applications/programs (wing skins, Vertical Tail Plane [VTP] skins, winglets, bulkheads, cargo doors, etc.), together with the lack of automation for the preform creation and its deposition onto the corresponding molds, this paper will cover different potential solutions for the manufacturing of skins and stiffeners. In all cases, looking to the automated dry multiaxial fabric preform creation, lay-up and forming.

  Abstract
  Considering the latest introduction of the dry multiaxial fabrics into Aeronautical applications/programs (wing skins, Vertical Tail Plane [VTP] skins, winglets, bulkheads, [...]

  • 0
  •  read

• PLATFORM: Study of the integration of materials manufactured with CNTs in current processes of manufacture by infusion in aeronautics

  L. Sánchez, B. López, I. Gaztelumendi, R. Seddon, M. Chapartegui, ,. P.Latko

  Materiales Compuestos (2022). Vol. 03 - Comunicaciones Matcomp17 (2019), (Núm. 3 - Procesos de Fabricación II y Materiales Avanzados), 4

  
  

  Abstract

  The need to improve non-intrinsic properties of composite materials is a fact that leads to studies such as the one carried out in this project, where the possibility of integrating new materials development into common materials is analyzed to provide them with an improved properties: mechanical or electric. The main objective of the project is to analyze the possibility of introducing the new materials into the current manufacturing processes, improving the properties of the raw material (dry carbon fiber fabric infused with monocomponent epoxy resin), under aeronautical requirements. Two material developments are made with carbon nanotubes in two different formats: buckypapers and thermoplastic doped veils. The implementation of each materials has been studied in current infusion processes, more concretely manufacturing processes by RTM (Resin Transfer Molding). The studied possibilities are: buckypapers incorporated in dry preforms, for their subsequent infusion and doped veils embedded in dry preforms, for their subsequent infusion. The obtained results at this moment (2nd year of the project) are satisfactory, although it´s necessary to optimize the materials to improve the automation of the manufacturing process and achieve a greater improvement of properties.

  Abstract
  The need to improve non-intrinsic properties of composite materials is a fact that leads to studies such as the one carried out in this project, where the [...]

  • 2
  •  read

• Accurate Vacuum Assisted Resin Infusion simulation through a fluid-solid coupled modeling

  A. Dereims, L. Dufort, A. Juan

  Materiales Compuestos (2022). Vol. 03 - Comunicaciones Matcomp17 (2019), (Núm. 3 - Procesos de Fabricación II y Materiales Avanzados), 3

  
  

  Abstract

  The need for an increase of production rate in aerospace industry implies a growing interest in composite manufacturing process simulation with a strong requirement on predictive accuracy. In this context, ESI enhanced its PAM-COMPOSITES software introducing fluid-solid coupled approach in PAM-RTM module in order to simulate more accurately Vacuum Assisted Resin Infusion (VARI) process. VARI consists in impregnating a dry preform laid on a rigid mold and placed under a distribution medium and a vacuum bag. During the impregnation resin flows preferentially into the distribution medium and then in the preform which may undergo deformations due to the flexibility of the vacuum bag. Usual 2.5D approaches, using shell elements with thickness depending on resin pressure, cannot account for resin flow through the thickness due to permeability and fiber fraction gradients implied by the material used and/or solid mechanics effects (such as compression in curvatures). ESI new approach, resulting from several years of collaboration with academics, consists in a 3D finite element modeling. It is based on the coupling of resin flow, governed by Darcy’s law, with the preform behavior, considered as porous medium undergoing deformations, through Terzaghi’s principle. Thus it results in more predictive filling time and properties (thicknesses, fiber volume contents, geometry) of the final product.

  Abstract
  The need for an increase of production rate in aerospace industry implies a growing interest in composite manufacturing process simulation with a strong requirement on predictive [...]

  • 8
  •  read