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Research Papers: Design and Analysis

Functionally Graded Hollow Sphere With Piezoelectric Internal and External Layers Under Asymmetric Transient Thermomechanical Loads

[+] Author and Article Information
M. Jabbari

Mechanical Engineering Department,
South Tehran Branch,
Islamic Azad University,
P.O. Box 145 781 5751,
Tehran, Iran

S. M. Mousavi

Mechanical Engineering Department,
South Tehran Branch, Islamic Azad University,
P.O. Box 146 963 6136,
Tehran, Iran

M. A. Kiani

Mechanical Engineering Department,
South Tehran Branch, Islamic Azad University,
P.O. Box 615 563 5893,
Ahvaz, Iran

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received July 2, 2016; final manuscript received June 21, 2017; published online August 31, 2017. Assoc. Editor: Albert E. Segall.

J. Pressure Vessel Technol 139(5), 051207 (Aug 31, 2017) (20 pages) Paper No: PVT-16-1101; doi: 10.1115/1.4037444 History: Received July 02, 2016; Revised June 21, 2017

In this paper, an analytical method is developed to obtain the solution for the two-dimensional (2D) (r,θ) transient thermal and mechanical stresses in a hollow sphere made of functionally graded (FG) material and piezoelectric layers. The FGM properties vary continuously across the thickness, according to the power functions of radial direction. The temperature distribution as a function of radial and circumferential directions and time is obtained solving the energy equation, using the method of separation of variables and Legendre series. The Navier equations are solved analytically using the Legendre polynomials and the system of Euler differential equations.

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References

Figures

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Fig. 1

Geometry of the problem studied

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Fig. 2

Transient temperature distribution in the outer piezo layer hollow sphere

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Fig. 3

Transient temperature distribution in FGM hollow sphere

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Fig. 4

Transient temperature distribution in the inner piezo layer hollow sphere

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Fig. 5

Radial displacement in the FGM layer

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Fig. 6

Circumferential displacement in the FGM layer

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Fig. 7

Radial stress in the FGM layer

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Fig. 8

Circumferential stress in the FGM layer

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Fig. 9

Radial electrical displacement in the sensor layer

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Fig. 10

Electric potential in the sensor layer

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Fig. 11

Electric potential in the actuator layer

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Fig. 12

Radial stress in the piezo FGM hollow sphere along the thickness

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Fig. 13

Circumferential stress in the piezo FGM hollow sphere along the thickness

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Fig. 14

Radial electrical displacement in the sensor layer along the thickness

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Fig. 15

Electric potential in the actuator along the thickness

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Fig. 16

Electric potential in the sensor layer along the thickness

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Fig. 17

The comparison of Radial stress in the FGM hollow sphere along the thickness by present and the finite element method

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