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Research Papers: Design and Analysis

Study of Elastic Strength for Cylinders With Hillside Nozzle

[+] Author and Article Information
J. Fang, Z. F. Sang

Department of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, P.R.C.

N. Li

Department of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, P.R.C.; State Power Environmental Protection Research Institute, Nanjing 210031, P.R.C.

G. E. Widera

Center for Joining and Manufacturing Assembly, Marquette University, Milwaukee, WI 53233

J. Pressure Vessel Technol 131(5), 051202 (Jul 27, 2009) (8 pages) doi:10.1115/1.3148085 History: Received September 08, 2008; Revised February 03, 2009; Published July 27, 2009

The objective of this paper is to investigate the elastic strength of cylindrical vessels with hillside nozzle under out-of-plane moment on the nozzle. A total of 5 model vessels with different hillside nozzle angles and loading directions were fabricated for study by experimental and finite element numerical simulation methods. The results indicate that an obvious stress concentration exists at the intersection area between vessel and nozzle. The maximum elastic stress occurs at the inside corner of the nozzle-cylinder intersection in transverse section of the cylinders. The dominant stress is the circumferential stress in the cylindrical vessels. The maximum elastic stress and the stress ratio decrease with an increase in the hillside nozzle angle and so does the nozzle displacement.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 9

Deformation of vessel models under the same moment (a) M1, (b) M2, (c) M3, (d) M4, and (e) M5

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Figure 8

Local stress of models under the moment 1.0kNm

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Figure 7

Finite element mesh of model M2

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Figure 6

Stress distributions in transverse section for model M4 under 1.0kNm: (a) the tensioned side of model M4, (b) the compressed side of model M4, and (c) around the line section of model M4

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Figure 5

Stress distributions in transverse section for model M2 under 1.0kNm: (a) the tensioned side of model M2, (b) the compressed side of model M2, and (c) around the line section of model M2

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Figure 4

Experimental photo of model M3 in the test: (a) before the loading process and (b) during the loading process

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Figure 3

Locations of strain measuring points for model M3

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Figure 2

Weld construction of experimental models

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Figure 1

Structure of experimental vessels

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