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Research Papers: Design and Analysis

Plastic Analysis for Cylindrical Vessels Under In-Plane Moment on the Nozzle

[+] Author and Article Information
B. H. Wu

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

Z. F. Sang

Department of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, People’s Republic of Chinawbh@wxtjy.com

G. E. O. Widera

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

J. Pressure Vessel Technol 132(6), 061203 (Oct 13, 2010) (8 pages) doi:10.1115/1.4001741 History: Received August 15, 2009; Revised April 29, 2010; Published October 13, 2010; Online October 13, 2010

Abstract

The objective of this paper is to determine the plastic limit moment for cylindrical vessels with a nozzle under in-plane moment loading. Three full scale test models with different $d/D$ ratios were fabricated for the experiment. A three-dimensional nonlinear finite element analysis was also performed. The plastic limit moment of the cylindrical vessel-nozzle connections was determined approximately by the twice-elastic-slope criterion. The results indicate that the plastic limit moments obtained by the experiment and finite element analysis are in good agreement. On the basis of the above results, a parametric analysis of the plastic limit moment for cylindrical vessels under in-plane moment on the nozzle was carried out, and an empirical formula is proposed. The results can serve as a supplement to the available data of plastic limit load for cylindrical vessel-nozzle connection structures under external load.

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Figures

Figure 1

Arrangement of the model vessels (mm)

Figure 2

The curve of the engineering stress-strain: (a) Q235-A; (b) 20#

Figure 3

Locations of the strain gauges for model L2

Figure 4

Photo of model L1 during the test

Figure 5

Load and elastic-plastic deformation response of the nozzle

Figure 6

Load-deformation of the test vessels: vessel Nos. (a) L1 and (b) L2

Figure 7

Load-displacement curves for the test models (sensor No.3): load-displacement curves (a) for the L1 vessel, (b) for L2 vessel, and (c) for L3 vessel

Figure 8

Load-strain curves for the test models (strain gauge No.6): load-strain curves (a) for the L1 vessel, (b) for the L2 vessel, and (c) for the L3 vessel

Figure 9

Finite element mesh for model vessel No. L2

Figure 10

Local deformation for model L2(Mi=13.05 kN m)

Figure 11

Load-displacement plots for the simulation models (sensor No.3): load-displacement plots (a) for the L1 vessel, (b) for the L2 vessel, and (c) for L3 vessel

Figure 12

Load-strain plots for simulation models (strain gauge No.6): load-strain plots (a) for L1 the vessel, (b) for the L2 vessel, and (c) for the L3 vessel

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