The creep behavior of a pressurized tank, which is assumed to be made of functionally graded materials, is studied in this paper. The elastic response under the internal and external pressures is first obtained when Young’s modulus obeys a power function along with the wall thickness. If the creep exponent remains constant and the creep coefficient varies with the radial coordinate, a closed-form solution can be derived for the time-dependent behavior of the spherical tank. The effects of material gradients on the creep stress and strain are investigated in detail. The results show that the stress level under the steady creep state is determined by the distribution of the creep properties. However, the magnitude of the creep strain is influenced by the elastic modulus distribution, as well as the creep property distribution inside the functionally graded materials. Compared with the finite element analysis results, the optimum time step value is also investigated. Some fundamental knowledge of the materials distribution is achieved to reduce the maximum creep stress/strain and to uniformize the stress level inside the functionally graded materials tank.
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e-mail: chenjj@wm.cau.ac.kr
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October 2011
Research Papers
Creep Behavior of Pressurized Tank Composed of Functionally Graded Materials
JianJun Chen,
JianJun Chen
Department of Mechanical Engineering,
e-mail: chenjj@wm.cau.ac.kr
Chung-Ang University
, Seoul 156756, Korea; School of Mechanical and Power Engineering, East China University of Science and Technology
, Shanghai 200237, China
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KeeBong Yoon,
KeeBong Yoon
Department of Mechanical Engineering,
Chung-Ang University
, Seoul 156756, Korea
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Shan-Tung Tu
Shan-Tung Tu
School of Mechanical and Power Engineering,
East China University of Science and Technology
, Shanghai 200237, China
Search for other works by this author on:
JianJun Chen
Department of Mechanical Engineering,
Chung-Ang University
, Seoul 156756, Korea; School of Mechanical and Power Engineering, East China University of Science and Technology
, Shanghai 200237, Chinae-mail: chenjj@wm.cau.ac.kr
KeeBong Yoon
Department of Mechanical Engineering,
Chung-Ang University
, Seoul 156756, Korea
Shan-Tung Tu
School of Mechanical and Power Engineering,
East China University of Science and Technology
, Shanghai 200237, ChinaJ. Pressure Vessel Technol. Oct 2011, 133(5): 051401 (9 pages)
Published Online: July 11, 2011
Article history
Received:
September 17, 2008
Revised:
January 4, 2011
Online:
July 11, 2011
Published:
July 11, 2011
Citation
Chen, J., Yoon, K., and Tu, S. (July 11, 2011). "Creep Behavior of Pressurized Tank Composed of Functionally Graded Materials." ASME. J. Pressure Vessel Technol. October 2011; 133(5): 051401. https://doi.org/10.1115/1.4003455
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