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RESEARCH PAPERS

Plastic Limit Loads of Pad Reinforced Cylindrical Vessels Under Out-of-Plane Moment of Nozzle

[+] Author and Article Information
Z. F. Sang, H. F. Wang

Department of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing, 210009, People’s Republic of China

L. P. Xue, G. E. O. Widera

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

J. Pressure Vessel Technol 128(1), 49-56 (Nov 01, 2005) (8 pages) doi:10.1115/1.2140800 History: Received September 26, 2005; Revised November 01, 2005

The purpose of this work is to study the plastic limit load of pad reinforced cylindrical vessels with different d/D ratios under out-of-plane moment loading on a nozzle. Three full-scale test models were designed and fabricated. A 3-D nonlinear finite element numerical analysis was also performed. Data on plastic limit moment is obtained from load-displacement and load-strain responses. The results indicate that plastic limit loads determined by test (including displacement and strain measurements) and finite element analysis are in agreement.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Construction of the model vessel J1p

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Figure 2

Typical engineering stress-strain curves (ambient temperature, strain rate=10%): (a) Engineering σ-ε curve for material Q235-A(T=8mm); and (b) engineering σ-ε curve for material 20 (ϕ133×4mm)

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Figure 3

Details of the welds (dimensions in mm)

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Figure 4

Loading system: 1. support frame, 2. hydraulic jacket, 3. force sensor, 4. connection rod, 5. displacement sensor, 6. nozzle, 7. mandrel, 8. cylinder, 9. bolts and nuts, 10. flange, 11. base plate, and 12. pad

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Figure 5

Locations of strain gauges for vessel J2p

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Figure 6

Data acquisition system

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Figure 7

A photograph of vessel J2p during the test

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Figure 8

Load-displacement plots and limit loads for model vessel J1p: (a) For displacement sensor No. 1; (b) for displacement sensor No. 2; (c) for displacement sensor No. 3; and (d) for displacement sensor No. 4

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Figure 9

Load-strain plots and plastic limit loads for model vessel J1p: (a) Measuring point No. 1; (b) measuring point No. 6; (c) measuring point No. 11; and (d) measuring point No. 16

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Figure 10

Finite element mesh of model vessels J2p

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Figure 11

FE load-displacement curves and corresponding plastic limit loads: (a) Location of displacement sensor No. 1 for J1p vessel; (b) location of displacement sensor No. 1 for J2p vessel; and (c) location of displacement sensor No. 1 for J3p vessel

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Figure 12

FE load-strain curves and corresponding plastic limit loads: (a) Location of strain gauge No. 11 for J1p vessel; (b) location of strain gauge No. 16 for J1p vessel; (c) location of strain gauge No. 11 for J2p vessel; (d) location of strain gauge No. 16 for J2p vessel; (e) location of strain gauge No. 11 for J3p vessel; and (f) location of strain gauge No. 16 for J3p vessel

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