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Research Papers: Design and Analysis

Study of Plastic Limit Load on Pressurized Cylinders With Lateral Nozzle

[+] Author and Article Information
N. Li

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

Z. F. Sang1

Department of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, P.R.C.zfsang@njut.edu.cn

G. E. Widera

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

1

Corresponding author.

J. Pressure Vessel Technol 130(4), 041210 (Oct 02, 2008) (7 pages) doi:10.1115/1.2967743 History: Received November 10, 2006; Revised June 25, 2007; Published October 02, 2008

The objective of this work is to study the plastic limit load of cylindrical vessels with different lateral angles θ under increasing internal loadings. Three full size test vessels with different structure dimensions were fabricated for testing. A three-dimensional, nonlinear, finite element numerical simulation was also performed. The approximate plastic limit load was obtained using a twice-elastic-slope criterion. The plastic deformation characteristics for the analysis model are discussed. The results show that distinct deformation characteristics occurred on the three experimental vessels. The intersection area shrank in the longitudinal section of the cylinder, while bulges appeared in the transverse section. The angle between the axis of lateral and the cylinder increased. The plastic limit loads determined by experiment and numerical simulation methods are in good agreement.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Typical stress-strain curves (Ambient temperature, strain rate 10%) (a) True stress-strain curve for material Q235-B (b) True stress-strain curve for Material 20#

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Figure 2

Details of the welds (dimension in mm)

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Figure 3

Location of the strain gauges for Experimental Vessel No. 3

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Figure 4

Photographs of Vessel 3 (a) A photograph of Vessel No. 3 during the test (b) A photograph of Vessel No. 3 after the test

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Figure 5

Load-strain plots and plastic limit load for Vessel No. 3 (θ=30deg) (a) Measuring point No. 6 (b) Measuring point No. 11 (c) Measuring point No. 16 (d) Measuring point No. 22 (e) Measuring point No. 28

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Figure 6

Finite element mesh of Model No. 3

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Figure 7

Deformation and outspread of the plastic area for Model No. 3 under different loads (a) 1.5MPa (displacement display scaling=4.0, plastic area first appears) (b) 8.0MPa (displacement display scaling=4.0)

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Figure 8

FEM load-strain curves and corresponding plastic limit loads for Model No. 3 (a) Location of Strain Gauge No. 22 for Model 3 (b) Location of Strain Gauge No. 16 for Model 3 (c) Location of Strain Gauge No. 11 for Model 3 (d) Location of Strain Gauge No. 1 for Model 3 (e) Location of Strain Gauge No. 6 for Model 3 (f) Location of Strain Gauge No. 28 for Model 3

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