Study on the effect of functionally graded coating layers on elastic deformation of thick circular plates: A closed-form elasticity solution

Functionally Gradient Coatings (FGCs) are emerging materials with an improved service life and have a promising future for the production of (a) tailored components for applications subjected to large thermal gradients, (b) smart coating with improved corrosion and wear resistance, (c) improved fatigue wear, and (d) improved material structures for energy applications like batteries, fuel cells, etc. FGCs may be developed by physical/chemical vapor deposition, electro/electroless deposition, thermal spray deposition technique, etc. Thermal spraying refers to the technique or a group of techniques whereby molten or semi-molten droplets of materials are sprayed onto a solid substrate to develop the coating. In this chapter, detailed overviews of the development of functionally graded coating by thermal spray deposition techniques are presented. In addition, a few research results on the development of functionally graded coating for tribological and thermal barrier applications are presented.

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A closed form solution for bending/stretching analysis of functionally graded circular plates under asymmetric loading using the Green function

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/09544062jmes1818 ◽

2010 ◽

Vol 224 (6) ◽

pp. 1153-1163 ◽

Cited By ~ 2

Author(s):

A R Saidi ◽

A Naderi ◽

E Jomehzadeh

Keyword(s):

Green Function ◽

Closed Form ◽

Volume Fraction ◽

Plate Theory ◽

Closed Form Solution ◽

Form Solution ◽

Functionally Graded ◽

Transverse Displacement ◽

Circular Plates ◽

Equilibrium Equations

In this article, a closed-form solution for bending/stretching analysis of functionally graded (FG) circular plates under asymmetric loads is presented. It is assumed that the material properties of the FG plate are described by a power function of the thickness variable. The equilibrium equations are derived according to the classical plate theory using the principle of total potential energy. Two new functions are introduced to decouple the governing equilibrium equations. The three highly coupled partial differential equations are then converted into an independent equation in terms of transverse displacement. A closed-form solution for deflection of FG circular plates under arbitrary lateral eccentric concentrated force is obtained by defining a new coordinate system. This solution can be used as a Green function to obtain the closed-form solution of the FG plate under arbitrary loadings. Also, the solution is employed to solve some different asymmetric problems. Finally, the stress and displacement components are obtained exactly for each problem and the effect of volume fraction is also studied.

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Analysis on Functionally Graded Material Coating Interface Crack

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.602-604.1596 ◽

2012 ◽

Vol 602-604 ◽

pp. 1596-1599

Author(s):

Bo He ◽

Chang Qing Sun

Keyword(s):

Elastic Modulus ◽

Stress Intensity ◽

Intensity Factor ◽

Interface Crack ◽

Functionally Graded ◽

Physical Parameters ◽

Mode I ◽

Modulus Ratio ◽

Functionally Graded Coating ◽

Graded Coating

It is assumed that the physical parameters of functionally graded coating material accords with the variation of degree n polynomial, and based on this material model, the behavior of crack fracture on the interface of functionally graded coating is studied. The results show that when the functionally graded coating structure bears a tension load, stress intensity factors of mode I and mode II exist at the same time generally, and the intensity factor of mode I occupies a leading position all along. Besides, when the elastic modulus ratio of the base to the functionally graded coating top is 5 and the elastic modulus of functionally graded coating varies linearly, the stress intensity factor of interface crack is the smallest, and with the increasing of elastic modulus ratio, the optimal non-uniform parameter tends to be larger than 1.

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