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Research Papers: Design and Analysis

New Criterion for the Definition of Plastic Limit Load in Nozzle Connections of Pressure Vessels

[+] Author and Article Information
V. N. Skopinsky

Moscow State Industrial University,
Chair of Material Strength

N. A. Berkov

Moscow State Industrial University,
Moscow 115280, Russia
e-mail: skopin-j@mail.msiu.ru

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the Journal of Pressure Vessel Technology. Manuscript received January 31, 2012; final manuscript received April 3, 2012; published online March 18, 2013. Assoc. Editor: G. E. Otto Widera.

J. Pressure Vessel Technol 135(2), 021206 (Mar 18, 2013) (6 pages) Paper No: PVT-12-1013; doi: 10.1115/1.4007188 History: Received January 31, 2012; Revised April 03, 2012

In this research, a new criterion for determining the plastic limit load in shell intersections using elastic-plastic finite element analysis is presented. Using the proposed maximum criterion of the rate of the change of the relative plastic work (PW), a numerical procedure is described to define the plastic pressure. Also, a specific plastic work criterion is presented using a local deformation parameter. Results of comparisons with different criteria were considered for experimental models of cylindrical vessels with radial and nonradial (lateral) nozzles. A parametric study of the radial intersections of cylindrical shells under the internal pressure loading was performed to examine the influence of the diameter ratio on the plastic limit pressure on the basis of the proposed criteria.

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Figures

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Fig. 1

Vessel-nozzle geometry

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Fig. 2

Finite element mesh for model No. 4

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Fig. 3

Maximum criterion of rate of change of relative plastic work (model No. 1). (a) Relative plastic work—load curve. (b) Rate of change of relative plastic work—load curve.

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Fig. 4

Specific plastic work criterion (model 1)

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Fig. 5

Effect of d/D on plastic limit pressure: 1—criterion of the maximum rate of change of the relative plastic work and 2—specific plastic work criterion

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