Development of Composites Sandwich Structures Usin

发布时间：2019-10-22

Journal of Materials Science and Engineering A 8 (5-6 (2018 100-107 doi: 10.17265/2161-6213/2018.5-6.003 D DAVID PUBLISHING
Development of Composites Sandwich Structures Using a Core Cork D. Regaçon1 and A. Garay2
1. UFN, University Franciscana Santa Maria, Santa Maria, RS 97015-001 Brazil 2. PPGEM, Federal University of Rio Grande do Sul (UFRGS, Porto Alegre, RS 91501-970, Brazil
Abstract: Sandwich structures are comprised of two external faces/skins (usually made of synthetic fiber/resin and a core between them, being lightweight and with high stiffness. The employment of composite materials such as engineering materials has achieved more space in various segments of the industry, due to the following properties found: low density, stiffness, resistance to abrasion, impact and corrosion developed along the technological advancement of materials. This study aimed to develop a composite structure sandwich with cork core using in the face resin unsaturated polyester and glass fiber material, in order to obtain a final material with improved mechanical and physical properties compared to a conventional composite, without core. The samples were obtained by pressing process for different volume percentage of glass fiber in order to evaluate the influence of this parameter on the behavior of the material. The different samples were mechanically analyzed using the tests by tensile, bending and hardness, revealing high efficiency, except for the bending test in which the sandwich composite showed lower values compared to the composite standard. It was also performed to test water absorption, thermal and acoustic insulation test achieving satisfactory results and proving the effectiveness of cork in the search for materials with insulating characteristics, thus enabling the use of cork as a raw material for this class of materials contributing to sustainability and helping to generate values and innovation. In addition, it functions as a great thermal and acoustic insulation.
Key words: Composite sandwich, cork core, mechanical and physical properties, thermal and acoustic properties.
1. Introduction
The sandwich composite panels were developed during World War II by the need for lighter materials and high rigidity, these structures have been developed over time and gaining more demanding applications [1]. A sandwich panel consists of two skins, or facings, with a core material in between, and it basically works like an I-beam. The skins take up the normal strains and give the structure a hard wearing surface [1], being sometimes built with a reinforcement made of glass or carbon fibers and a polymeric resin (e.g. epoxy or vinyl ester as matrix [2]. The core material must have adequate shear stiffness to absorb applied shear forces, distributing them over a large area, and low specific weight, being
Corresponding author: André Cechin Garay, Ph.D. in materials science and technology, research field: composites materials.
joined to the faces mechanically or by adhesive bonding. Among the range of cores available the most common are wood and cork no synthetic, and PVC, PET, PU, PS, PET and PVC foam cores synthetic. Cork is a biological tissue, non-toxic and renewable resources, recyclable, coating obtained from the trunk of the trees. The tree of Sobreiro (Quercus suber L. is the main feature of commercial cork extraction, although not the only species of the genus Quercus trees from which to get the cork [3]. It presents interesting physical and chemical properties which lead to more demanding applications. It is a practically impermeable material to liquids and gases, with high lightness, low thermal and electrical conductivity and a great acoustic absorber and vibration. The material is harmless, which has almost no lateral expansion when subjected to compression between Cork features that highlight the chemical and biological stability and good fire resistance [4].

Development of Composites Sandwich Structures Usin

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