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Sustainable sandwich composites made of recycled plastics
Published in Alphose Zingoni, Current Perspectives and New Directions in Mechanics, Modelling and Design of Structural Systems, 2022
This study explores the use of recycled PET (r-PET) plastic, and bio-resin reinforced with continuous PET fibers, as the core and facing components of a novel form of sandwich beams, respectively. The recycled plastic is sourced from postconsumer beverage/water bottles, whereas the bio-resin is derived from agricultural waste. The use of recycled plastic and bio-sourced resin yields a sandwich composite with a lower carbon footprint in regard to traditional sandwich panels/beams used structurally.
Testing the core of sandwich panels with square shear specimen
Published in Marian A. Giżejowski, Aleksander Kozłowski, Marcin Chybiński, Katarzyna Rzeszut, Robert Studziński, Maciej Szumigała, Modern Trends in Research on Steel, Aluminium and Composite Structures, 2021
Today lightweight sandwich panels are a common solution for roof and wall claddings. Due to their excellent weight to load ratio, their good heat insulation, their high load-bearing capacity as well as the economical manufacturing and erection process, sandwich panels are used frequently. Their load-bearing behaviour is usually analysed with beam models following their longitudinal axis, which also is the direction of production (x-axis) of linearly manufactured sandwich panels. Therefore, shear-test were developed for sandwich panels to determine the stiffness and strength of the core in the y-z-plane.
Direct sound transmission
Published in Carl Hopkins, Sound Insulation, 2020
Sandwich panels are sometimes used to form internal walls, external walls, doors, or roof elements. They usually consist of a relatively lightweight core material with a plate (e.g. plasterboard, cement particle board, steel) bonded to this core on each side (see Fig. 4.44). A variety of core materials are used such as foam, mineral wool, or a cardboard honeycomb. Initial design considerations are usually given to the structural and/or thermal performance so the properties of the core may end up being isotropic, orthotropic, or anisotropic, with or without rigid connections between the two plates across the core.
Carrera unified formulation for bending and free vibration analysis of sandwich plate with FG-CNT faces considering the both soft and stiff cores
Published in Mechanics of Advanced Materials and Structures, 2022
Davood Onvani, Amirhossein Jafari, Mohsen Botshekanan Dehkordi
Engineered materials, mostly inspired from nature, have been replacing the formal materials because of their high strength-to- and stiffness-to-weight ratios. Sandwich panels are known for their great bending rigidity, low specific weight, excellent vibration characteristics, and good fatigue properties. Sandwich structures have been widely used in the sandwich panels, and these kinds of panels can be used in engineering applications such as transportation, aerospace, marine sectors, and so forth. Generally, sandwich structures implicate two thin face-sheets connected to a relatively thick core by adhesion, welding or riveting. A typical sandwich structure may consist of a homogeneous core or a soft-core with two face sheets; top face sheet and bottom face sheet. To improve the mechanical properties of sandwich structure, the face sheets can be laminated composites [1], functionally graded materials [2], or polymer matrix with reinforcements [3].
Analytical modeling of textile reinforced concrete (TRC) sandwich panels: Consideration of nonlinear behavior and failure modes
Published in Mechanics of Advanced Materials and Structures, 2022
Zakaria Ilyes Djamai, Kamal Erroussafi, Amir Si Larbi, Ferdinando Salvatore, Gaochuang Cai
Sandwich panels have widely emerged in the building industry because their concept combines the development of lightweight structures with high flexural stiffness and good thermal and acoustic insulation. Sandwich panels often consist of two rigid facings and a thicker cellular core. The skin faces usually consist of steel reinforced concrete; however the design codes require thick covers to prevent steel corrosion which constitutes a barrier to attaining lightweight sandwich panels. Some researchers [1, 2] have focused on the use of fiber reinforced polymer (FRP) as sandwich panel skins. However, FRP has the constraints in terms of cost and the criteria of sustainable development, in addition to poor thermal stability, flammability and the toxicity of the fumes released from the polymer.
Design and production of sustainable lightweight concrete precast sandwich panels for non-load bearing partition walls
Published in Cogent Engineering, 2021
Fayez Moutassem, Kadhim Alamara
Although the sandwich panel system provides numerous advantages due to its lightweight and insulation properties, its application comes with challenges such as bonding issues and low strength. With the increased focus on sustainability and use of sustainable products, there is a need to optimize the design and production of quality lightweight partition wall systems to provide superior insulation, durability and rapid installation in comparison with conventional blocks while ensuring adequate bonding, strength and mechanical properties to sufficiently fit its purpose. This study involves the design and production of a lightweight precast concrete sandwich panel for a non-load bearing partition wall system, utilizing EPS concrete for the inner core. The optimum mixture proportions will be identified and proposed. Practical procedures for EPS concrete panel production and installation will be examined and proposed in this study. An experimental program will be developed to determine the physical and mechanical properties for the proposed EPS concrete wall system. In addition, technical and installation time comparisons between building a wall using conventional blocks as opposed to using the EPS concrete precast partition wall system will be drawn.