Controllable effective complex permittivity of functionally graded composite materials: A numerical investigation

2007 ◽  
Vol 102 (9) ◽  
pp. 094105 ◽  
Author(s):  
Abdelilah Mejdoubi ◽  
Christian Brosseau
Keyword(s):  
Composite Materials ◽  
Numerical Investigation ◽  
Complex Permittivity ◽  
Functionally Graded ◽  
Functionally Graded Composite

scholarly journals Functionally Graded Composite Materials: An Overview

2014 ◽  
Vol 5 ◽  
pp. 1291-1299 ◽  
Author(s):  
Gururaja Udupa ◽  
S. Shrikantha Rao ◽  
K.V. Gangadharan
Keyword(s):  
Composite Materials ◽  
Functionally Graded ◽  
Functionally Graded Composite

Impact of the gamma and neutron attenuation behaviors on the functionally graded composite materials

2021 ◽  
Author(s):  
Uğur Gökmen ◽  
Zübeyde Özkan ◽  
Sema Bilge Ocak
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Energy Range ◽  
Gamma Ray ◽  
Effective Conductivity ◽  
Effective Atomic Number ◽  
Mean Free Path ◽  
Functionally Graded ◽  
Neutron Shielding ◽  
Functionally Graded Composite

Abstract Gamma-ray and neutron shielding properties of the AA6082 + TiO2 (0-50wt.%) functionally graded composite materials (FGCMs) were investigated using the PSD software. The values of the mean free path (MFP), half-value layer (HVL), linear attenuation coefficients (LAC), mass attenuation coefficient (MAC), tenth-value layer (TVL), exposure buildup factors (EBF), effective atomic number (Zeff), effective conductivity (Ceff), and fast neutron removal cross-sections (FNRC) were found for the energy range between 0.015–15 MeV. The increase in the TiO2 content in the AA6082 composite material has raised the values of MAC and LAC. The calculations for the EBFs were carried out using the G-P fitting method for the energy range between 0.015–15 MeV and penetration depth of up to 40 mfp. The results revealed that HVL values ranged between 0.01-0.116 cm, TVL values ranged between 0.01-0.385 cm, FNRC values ranged between 7.918-10.017 cm-1, and Ceff values ranged between 5.67 x1010 and 9.85x1010 S/m. The AA6082 + TiO2 (50%) composite material was observed to provide the maximum photon and neutron shielding capacity since it offered the highest Zeff, MAC, and FNRC values, and the lowest HVL value. In terms of several aspects, the research is considered original. Besides contributing to several technologies including nanotechnology and space technologies, present research’s results may contribute to nuclear technology.

Design of Functionally Graded Composite Structures for Control of Stress

2001 ◽  
Vol 702 ◽  
Author(s):  
Robert Lipton ◽  
Ani Velo
Keyword(s):  
Composite Materials ◽  
Numerical Method ◽  
Functionally Graded Materials ◽  
Composite Structures ◽  
Functionally Graded ◽  
Structural Components ◽  
Graded Materials ◽  
Functionally Graded Composite ◽  
Minimum Stress

ABSTRACTIn this paper a methodology is introduced for the design of structural components made from composite materials for the control of stress. A numerical method is developed for designing functionally graded materials with minimum stress in prescribed sub-domains inside the structure.

Thermal Post-Buckling Analysis of Functionally Graded Composite Plates with Nonlinear Aerodynamic Forces

2010 ◽  
Vol 123-125 ◽  
pp. 280-283
Author(s):  
Chang Yull Lee ◽  
Ji Hwan Kim
Keyword(s):  
Material Properties ◽  
Numerical Solutions ◽  
Virtual Work ◽  
Shear Deformation Theory ◽  
Composite Plates ◽  
Buckling Analysis ◽  
Functionally Graded ◽  
Governing Equations ◽  
Functionally Graded Composite ◽  
Post Buckling

The post-buckling of the functionally graded composite plate under thermal environment with aerodynamic loading is studied. The structural model has three layers with ceramic, FGM and metal, respectively. The outer layers of the sandwich plate are different homogeneous and isotropic material properties for ceramic and metal. Whereas the core is FGM layer, material properties vary continuously from one interface to the other in the thickness direction according to a simple power law distribution in terms of the volume fractions. Governing equations are derived by using the principle of virtual work and numerical solutions are solved through a finite element method. The first-order shear deformation theory and von-Karman strain-displacement relations are based to derive governing equations of the plate. Aerodynamic effects are dealt by adopting nonlinear third-order piston theory for structural and aerodynamic nonlinearity. The Newton-Raphson iterative method applied for solving the nonlinear equations of the thermal post-buckling analysis

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