Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Fabrication and characterization of honeycomb panels with printed circuit board faces
Submission Author:
Pedro Alves , SP , Brazil
Co-Authors:
Pedro Alves, Mateus Sant'Ana, tiago rodrigues dos santos, Manuel Barcelos Júnior
Presenter: Pedro Alves
doi://10.26678/ABCM.COBEM2021.COB2021-1879
Abstract
Honeycomb structures are widely used, especially in the aeronautics, aerospace industry. This is because of the mechanical properties that give them high mechanical strength, low specific mass, high energy absorption and good acoustic insulation. Sandwich Structures are made by two faces of a resistant material in its exterior. They have their core composed of a different material, usually with lower density and resistance than the material of the external faces. There are several types of geometry for sandwich structures, as the normal hexagon, the reinforced every other ribbon, reinforced every ribbon, and others. Although, the most conventional is the hexagonal honeycomb core. The most common material used to manufacture honeycomb sandwich panels is aluminum alloy. This paper proposed a manufacturing process of honeycomb sandwich panels made by Fused Deposition Modeling (FDM) – also known as 3D printing. With this technology, it is now possible to fabricate the core with thermoplastic materials. In 3D printing, we employ some thermoplastic materials: polylactic acid (PLA), acrylonitrile butadiene styrene (ABS), and polyethylene terephthalate glycol (PETG). The faces are Phenolite laminate and Fiberglass laminate. To fabricate the sandwich panel, we used epoxy resin to bond the core to the faces. The Phenolite and Fiberglass laminates used for face sheets in honeycomb panels can still function as circuit boards. For instance, we can apply this configuration to optimize the volume of a small satellite. Therefore, this work aims to study honeycomb sandwich panel manufacturing with circuit boards for faces (Phenolite and Fiberglass laminates), and 3D printed thermoplastic cores (PLA, ABS, and PETG materials). We characterize the honeycomb sandwich specimens experimentally according to the standard ASTM C393 that regulates bending test and numerically by a finite element method simulation. The manufacture of the sandwich panels indicates good adhesion between the core and the faces. Comparing the bending tests' experimental and numerical results strictly in the elastic region presented satisfactory agreement.
Keywords
honeycomb structures, Sandwich Structures, Composite Materials, 3D printing, Printed Circuit Board
