scholarly journals Optimization of a Totally Fiber-Reinforced Plastic Composite Sandwich Construction of Helicopter Floor for Weight Saving, Fuel Saving and Higher Safety

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2735
Author(s):  
Alaa Al-Fatlawi ◽  
Károly Jármai ◽  
György Kovács
Keyword(s):  
Epoxy Resin ◽  
Glass Fibers ◽  
Interior Point Algorithm ◽  
Structural Elements ◽  
Fiber Reinforced ◽  
Fiber Reinforced Plastic ◽  
Composite Sandwich ◽  
Weight Saving ◽  
Frp Composite ◽  
Reinforced Plastic

The application of fiber-reinforced plastic (FRP) composites as structural elements of air vehicles provides weight saving, which results in a reduction in fuel consumption, fuel cost, and air pollution, and a higher speed. The goal of this research was to elaborate a new optimization method for a totally FRP composite construction for helicopter floors. During the optimization, 46 different layer combinations of 4 different FRP layers (woven glass fibers with phenolic resin; woven glass fibers with epoxy resin; woven carbon fibers with epoxy resin; hybrid composite) and FRP honeycomb core structural elements were investigated. The face sheets were composed of a different number of layers with cross-ply, angle-ply, and multidirectional fiber orientations. During the optimization, nine design constraints were considered: deflection; face sheet stress (bending load, end loading); stiffness; buckling; core shear stress; skin wrinkling; intracell buckling; and shear crimping. The single-objective weight optimization was solved by applying the Interior Point Algorithm of the Matlab software, the Generalized Reduced Gradient (GRG) Nonlinear Algorithm of the Excel Solver software, and the Laminator software. The Digimat-HC software solved the numerical models for the optimum sandwich plates of helicopter floors. The main contribution is developing a new method for optimizing a totally FRP composite sandwich structure—due to its material constituents and construction—that is more advantageous than traditional helicopter floors. A case study validated this fact.

DERAKANE 8084

Alloy Digest ◽  
1991 ◽  
Vol 40 (11) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Physical Properties ◽  
Epoxy Resin ◽  
Tensile Properties ◽  
Fiber Reinforced ◽  
Fiber Reinforced Plastic ◽  
Chemical Company ◽  
Thermoset Resins ◽  
Reinforced Plastic

Abstract DERAKANE 8084 expands the serviceability of thermoset resins in traditional fiber-reinforced plastic applications. The inherent toughness of the epoxy resin has been enhanced with a reactive elastomer. This datasheet provides information on physical properties, hardness, and tensile properties. It also includes information on corrosion resistance. Filing Code: P-31. Producer or source: The Dow Chemical Company, Dow Plastics.

scholarly journals Characterization of the Epoxy Resin and Carbon Fiber Reinforced Plastic Stress-Strain State by Modified Carbon Nanotubes

2018 ◽  
Vol 20 (2) ◽  
pp. 137
Author(s):  
A. Yermakhanova ◽  
M. Ismailov
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Fiber ◽  
Plastic Strain ◽  
Epoxy Resin ◽  
Compression Strength ◽  
Carbon Fiber Reinforced Plastic ◽  
Fiber Reinforced ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic ◽  
Carbon Fiber Reinforced

The epoxy resin in the form of Etal Inject-T compound, Sigratex KDK carbon fabric, Taunit-M carbon nanotubes conditionally named as CNT-1, as well as functionalized (modified) variety of them by grafting to the surface of new chemical groups: carboxylated ‒ CNT-2, carboxyl-hydroxylated ‒ CNT-3, amidated ‒ CNT-4 were used in the work. The experiments were performed on the compression strength and bending strength of the samples. The injection of CNT-1 into epoxy resin or carbon fiber reinforced plastic did not produce the hardening. The injection of 0.05% of CNT-2 into the epoxy resin had the following effect: there is no influence in the area of quasielastic strains, the hardening was up to 25% in the areas of plastic and elastic-plastic strain. The injection of 0.15% of functionalized carbon nanotubes into the carbon fiber reinforced plastic produced the hardening for compression with CNT-2 ‒ 6%, CNT-3 ‒ 12%, CNT-4 – 17%, for bending – CNT-2 – 44%, CNT-3 – 59%, CNT-4 – 132%. It is established that with an increase in the strain rate of epoxy resin from 1 to 5 mm/min the areas of plastic and elastic-plastic strain gradually are reduced, there is only quasielastic strain with brittle fracture at 20 mm/ min, this value can be accepted as its strength characteristic. With an increase in the strain rate of carbon fiber reinforced plastic from 1 to 20 mm/min the compression strength gradually increases from 398 MPa to 425 MPa, and then stabilizes.

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