Accurate numerical modeling for functionally graded (FG) cylinders of finite length subjected to thermo mechanical load (original) (raw)
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2016
Using non-dimensional parameters, the governing equations of the homogeneous and heterogeneous cylinders made of functionally graded material (FGM) were derived under a combination of thermo-mechanical loads. The equations were solved analytically and numerically in a severe temperature and pressure gradient environment. The radial and circumferential stresses together with the radial displacement of FGM cylinder were analytically evaluated and the obtained results of heterogeneous FGM cylinder were compared with conventional homogeneous one. Moreover, in order to assess the accuracy of the derived equations, a numerical solution (NS) was performed using finite element method which was in accordance with the analytical solution (AS). The results of present work show that the use of FGM can optimize the cylinders which are exposed to the joint mechanical and thermal loads.
2016
This research develops thermo-elastic analysis of a functionally graded cylinder under thermo-mechanical loadings. Heat conduction equation in cylindrical coordinate system is solved. Thermal conductivity coefficient is graded along the radial direction. By considering a symmetric distribution of temperature, loading and boundary conditions, strain-displacement and stress-strain relations can be developed. Material properties such as modulus of elasticity are graded along the radial direction. For validation of the obtained results; a complete numerical analysis using finite element approach is presented.
The Thermo-Mechanical Finite Element Analysis of Functionally Graded Material
2016
ABSTACT: Functionally Graded Materials (FGMs) are materials that can be characterized by the variation in composition and structure gradually over volume along at least one specific direction. These variations can occur as a result of the chosen manufacturing process and they cause corresponding changes in the properties of the material. Functionally graded materials can be designed for specific function and applications. Nowadays, the possibilities of using FGM seem to be almost limitless. According to the literature these materials can be used in engineering, optical, power, and even in nuclear physics and medicine applications. The problem of thermal residual stresses creation in sintered FGM material during cooling from sintering temperature was presented in this paper. The influence of transition zone layers number on the distribution of residual stress was analysed. The thermo-mechanical analysis was performed using the finite element method (FEM). During performed analyses th...
Mechanical And Thermal Stresses In Functionally Graded Cylinders
2014
In this study, thermal elastic stress distribution occurred on long hollow cylinders made of functionally graded material (FGM) was analytically defined under thermal, mechanical and thermo mechanical loads. In closed form solutions for elastic stresses and displacements are obtained analytically by using the infinitesimal deformation theory of elasticity. It was assumed that elasticity modulus, thermal expansion coefficient and density of cylinder materials could change in terms of an exponential function as for that Poisson's ratio was constant. A gradient parameter n is chosen between - 1 and 1. When n equals to zero, the disc becomes isotropic. Circumferential, radial and longitudinal stresses in the FGMs cylinders are depicted in the figures. As a result, the gradient parameters have great effects on the stress systems of FGMs cylinders.
Functionally Graded Material Plate Subject to Thermomechanical Loading: A Review
International Journal of Engineering Research & Technology (IJERT) IJERTIJERT ISSN: 2278-0181, 2014
The material property of the functionally graded material (FGM) can be tailored to accomplish the specific demands in various engineering utilizations to achieve the advantage of the properties of individual material. This is possible due to the material composition of the FGM changes sequentially in a preferred direction. The thermo-mechanical deformation of FGM structures have attracted the attention of many researchers in the past few years in different engineering applications which include design of aerospace structures, heat engine components and nuclear power plants etc. The varying nature of FGMs makes design and analysis more challenging compared to traditional materials. In this analysis technique properties are employed for each layer, and thus the actual distribution of the phases does not explicitly affect the structural solution for the plate. The concept of FGMs hinges on materials science and mechanics due to the integration of the material and structural considerations into the final design of structural components. Because of the many variables that control the design of functionally graded microstructures, full utilization of the FGMs potential requires the development of appropriate modeling strategies for their response to combined thermomechanical loads. This paper reviews the major work in functionally graded materials (FGMs) with an emphasis on the plate. Various aspects of plate theory, finite element formulation methods, software used, material gradient functions, boundary conditions and various combinations of functionally graded materials are reflected in this paper.