Characterization and Mechanical Analysis of Functionally Graded Al-Si3N4 Composites through Centrifugal Process

2021 ◽  
Author(s):  
R. Ambigai ◽  
S. Prabhu
Keyword(s):  
Mechanical Analysis ◽  
Functionally Graded ◽  
Centrifugal Process

Mechanical analysis of shrink-fitted thick FG cylinders based on first order shear deformation theory and FE simulation

2021 ◽  
pp. 095440622110127
Author(s):  
Mohammad Reza Salehi Kolahi ◽  
Hossein Rahmani ◽  
Hossein Moeinkhah
Keyword(s):  
Shear Deformation ◽  
Deformation Theory ◽  
Fe Simulation ◽  
Shear Deformation Theory ◽  
Mechanical Analysis ◽  
Plane Elasticity ◽  
Functionally Graded ◽  
First Order ◽  
Analytical Functions ◽  
Plane Elasticity Theory

In this paper, the first order shear deformation theory is used to derive an analytical formulation for shrink-fitted thick-walled functionally graded cylinders. It is assumed that the cylinders have constant Poisson’s ratio and the elastic modulus varies radially along the thickness with a power function. Furthermore, a finite element simulation is carried out using COMSOL Multiphysics, which has the advantage of defining material properties as analytical functions. The results from first order shear deformation theory are compared with the findings of both plane elasticity theory and FE simulation. The results of this study could be used to design and manufacture for elastic shrink-fitted FG cylinders.

Numerical Simulation of a Centrifugal Process to Fabricate Permittivity Graded FGM from Alumina/Epoxy Mixture

2005 ◽  
Vol 492-493 ◽  
pp. 459-464 ◽  
Author(s):  
Shin-ichiro Tsuru ◽  
Noriyuki Hayashi ◽  
Tomohiko Onoda ◽  
Yasushi Sakamoto ◽  
Masanori Hara
Keyword(s):  
Reasonable Agreement ◽  
Simulation Method ◽  
Packing Fraction ◽  
Functionally Graded ◽  
Solid Particles ◽  
Number Density ◽  
Graded Materials ◽  
Filler Size ◽  
Centrifugal Process ◽  
Filler Distribution

A new numerical method to simulate the centrifugal process of fabricating functionally graded materials (FGMs) from solid-particles/viscous-matrix mixtures is proposed, and the simulation method was successfully applied to a practical fabrication process of FGM from an alumina-fillers/epoxy-resin mixture. Gradient profiles of dielectric constant of the resultant FGM were estimated by using the proposed method and compared with the experimental ones, resulting in reasonable agreement between them. Based on the numerical results, gradient pro- files of the number density and size of the dispersed fillers were confirmed, and contribution of the filler size toward the gradient in the packing fraction was demonstrated. It is concluded that the gradient in the filler distribution can be intentionally regulated by changing not only the centrifugal conditions, but also the size distribution of the fillers.

Thermo-mechanical analysis and optimization of functionally graded rotating disks

2020 ◽  
Vol 55 (5-6) ◽  
pp. 159-171
Author(s):  
Hassan Mohamed Abdelalim Abdalla ◽  
Daniele Casagrande ◽  
Luciano Moro
Keyword(s):  
Finite Element ◽  
Equivalent Stress ◽  
Rotating Disk ◽  
Mechanical Analysis ◽  
Theory Of Elasticity ◽  
Functionally Graded ◽  
Rotating Disks ◽  
Maximum Equivalent Stress ◽  
Quadratic Programming Method ◽  
Stress Uniformity

The behavior of thermo-mechanical stresses in functionally graded axisymmetric rotating hollow disks with variable thickness is analyzed. The material is assumed to be functionally graded in the radial direction. First, a two-dimensional axisymmetric model of the functionally graded rotating disk is developed using the finite element method. Exact solutions for stresses are then obtained assuming that the plane theory of elasticity holds. These solutions are in accordance with finite element ones, thus showing the validity of the assumption. Finally, in order to reduce the maximum equivalent stress along the radius, the optimization of the material distribution is addressed. To avoid subsequent finite element simulations in the optimization process, which can be computationally demanding, a nonlinear constrained optimization problem is proposed, for which the solution is obtained numerically by the sequential quadratic programming method, showing prominent results in terms of equivalent stress uniformity.

Mechanical Analysis of Functionally Graded Porous Structures: A Review

2020 ◽  
Vol 20 (13) ◽  
pp. 2041015
Author(s):  
Helong Wu ◽  
Jie Yang ◽  
Sritawat Kitipornchai
Keyword(s):  
Porous Materials ◽  
Material Properties ◽  
Mechanical Analysis ◽  
Functionally Graded ◽  
Future Research ◽  
Spatial Gradient ◽  
Porous Structures ◽  
Research Activities ◽  
Key Factor ◽  
New Generation

Functionally graded porous structures (FGPSs), characterized by a continuous spatial gradient in both porosity and material properties, have been considered as the new generation lightweight structures. Research activities on FGPSs have grown rapidly in recent years. This paper is devoted to review the existing research works on FGPSs and to highlight the important advances in this emerging area. It consists of: (i) a brief introduction of porous materials and Functionally graded porous materials (FGPMs); (ii) an elaboration of the key factor and micromechanical models related to material properties of FGPMs; (iii) a comprehensive review of mechanical analysis of FGPSs; (iv) a detailed discussion of the main challenges and future research directions; (v) a conclusion.

Thermo-Mechanical Analysis Of Functionally Graded Shells

2010 ◽  
Vol 33 (10) ◽  
pp. 942-963 ◽  
Author(s):  
M. Cinefra ◽  
E. Carrera ◽  
S. Brischetto ◽  
S. Belouettar
Keyword(s):  
Mechanical Analysis ◽  
Functionally Graded

Functionally Graded Nanocomposites: Manufacturing and Characterization

Aerospace ◽  
2006 ◽  
Author(s):  
Jared A. Rud ◽  
Yuri M. Shkel ◽  
Donald R. Matthys ◽  
Jeffrey P. Davidson
Keyword(s):  
Electric Field ◽  
Carbon Nanofiber ◽  
Speckle Pattern ◽  
Matrix Material ◽  
Mechanical Analysis ◽  
Functionally Graded ◽  
Electronic Speckle Pattern Interferometry ◽  
Random Orientation ◽  
The Matrix ◽  
Particle Alignment

Multi-walled carbon nanofiber (MWCN) composites having tailored internal structure are created using Field Aided Micro Tailoring (FAiMTa) technology. FAiMTa is a technique that relies on the application of an electric field to a suspension while it cures. The particles in the suspension align in the direction of the electric field while the matrix material hardens, locking the aligned particles in place. The outcome is an orthotropic micro-tailored composite. Three 1% by volume MWCN/epoxy composite systems are manufactured and characterized: (a) random orientation, (b) fibers aligned through the thickness of the sample, and (c) half-aligned through the thickness and half random orientation. Electronic Speckle Pattern Interferometry (ESPI) and Dynamic Mechanical Analysis (DMA) are used to evaluate mechanical material properties as a function of particle alignment. The half aligned sample demonstrates the ability of FAiMTa to locally tailor a material.

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