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Title: Experimental stress analyses of cylinder-to-cylinder shell models and comparisons with theoretical predictions

Abstract

Four carefully machined cylinder-to-cylinder shell models were tested, and the experimentally determined stresses were compared with theoretical predictions obtained from a thin-shell finite-element analysis. The models were idealized structures consisting of two circular cylindrical shells intersecting at right angles. The first model tested had a nozzle-to-cylinder diameter ratio of 0.5 and a diameter-to-thickness of 100 for both nozzle and cylinder. The second model had a nozzle-to-cylinder diameter ratio of 1.0 with a diameter-to-thickness ratio of 100. The third and fourth models had a nozzle-to-cylinder ratio of 0.129. For these models the diameter-to-thickness ratio was 50 for the cylinders and 7.68 for the nozzle of model 3, while it was 20.2 for the nozzle of model 4. All models were strain gaged and subjected to 13 separate loading cases. Comparisons of measured and predicted stress distributions are presented for three of these loadings - internal pressure, and in-plane and out-of-plane moments applied to the nozzle. The analytical predictions were obtained using a finite-element program that used flat-plate elements and which considered five degrees of freedom per node in the final assembled equations. The agreement between these particular finite-element predictions and the experimental results is shown to be reasonably good for themore » four models.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., Tenn. (USA)
OSTI Identifier:
7269739
Report Number(s):
CONF-760905-5
TRN: 76-018117
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: International joint pressure vessels and piping and petroleum mechanical engineering conference, Mexico City, Mexico, 19 Sep 1976
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; 42 ENGINEERING; REACTOR COMPONENTS; STRESS ANALYSIS; CYLINDERS; FINITE ELEMENT METHOD; MECHANICAL TESTS; NOZZLES; PIPE FITTINGS; SHELLS; MATERIALS TESTING; NUMERICAL SOLUTION; TESTING; 220200* - Nuclear Reactor Technology- Components & Accessories; 420200 - Engineering- Facilities, Equipment, & Techniques

Citation Formats

Gwaltney, R.C., Corum, J.M., Bolt, S.E., and Bryson, J.W.. Experimental stress analyses of cylinder-to-cylinder shell models and comparisons with theoretical predictions. United States: N. p., 1976. Web.
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Gwaltney, R.C., Corum, J.M., Bolt, S.E., & Bryson, J.W.. Experimental stress analyses of cylinder-to-cylinder shell models and comparisons with theoretical predictions. United States.
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Gwaltney, R.C., Corum, J.M., Bolt, S.E., and Bryson, J.W.. 1976. "Experimental stress analyses of cylinder-to-cylinder shell models and comparisons with theoretical predictions". United States. doi:. https://www.osti.gov/servlets/purl/7269739.
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@article{osti_7269739,
title = {Experimental stress analyses of cylinder-to-cylinder shell models and comparisons with theoretical predictions},
author = {Gwaltney, R.C. and Corum, J.M. and Bolt, S.E. and Bryson, J.W.},
abstractNote = {Four carefully machined cylinder-to-cylinder shell models were tested, and the experimentally determined stresses were compared with theoretical predictions obtained from a thin-shell finite-element analysis. The models were idealized structures consisting of two circular cylindrical shells intersecting at right angles. The first model tested had a nozzle-to-cylinder diameter ratio of 0.5 and a diameter-to-thickness of 100 for both nozzle and cylinder. The second model had a nozzle-to-cylinder diameter ratio of 1.0 with a diameter-to-thickness ratio of 100. The third and fourth models had a nozzle-to-cylinder ratio of 0.129. For these models the diameter-to-thickness ratio was 50 for the cylinders and 7.68 for the nozzle of model 3, while it was 20.2 for the nozzle of model 4. All models were strain gaged and subjected to 13 separate loading cases. Comparisons of measured and predicted stress distributions are presented for three of these loadings - internal pressure, and in-plane and out-of-plane moments applied to the nozzle. The analytical predictions were obtained using a finite-element program that used flat-plate elements and which considered five degrees of freedom per node in the final assembled equations. The agreement between these particular finite-element predictions and the experimental results is shown to be reasonably good for the four models.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1976,
month = 1
}
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    Model 2 in a series of four thin-shell cylinder-to-cylinder models was tested, and the experimentally determined elastic stress distributions were compared with theoretical predictions obtained from a thin-shell finite-element analysis. Both the cylinder and the nozzle of model 2 had outside diameters of 10 in., giving a d$sub 0$/D$sub 0$ ratio of 1.0, and both had outside diameter/ thickness ratios of 100. Sixteen separate loading cases in which one end of the cylinder was rigidly held were analyzed. An internal pressure loading, three mutually perpendicular force components, and three mutually perpendicular moment components were individually applied at the free endmore » of the cylinder and at the end of the nozzle. In addition to these 13 loadings, 3 additional loads were applied to the nozzle (in-plane bending moment, out-of-plane bending moment, and axial force) with the free end of the cylinder restrained. The experimental stress distributions for each of the 16 loadings were obtained using 152 three- gage strain rosettes located on the inner and outer surfaces. All the 16 loading cases were also analyzed theoretically using a finite-element shell analysis. The analysis used flat-plate elements and considered five degrees of freedom per node in the final assembled equations. The comparisons between theory and experiment show reasonably good general agreement, and it is felt that the analysis would be satisfactory for most engineering purposes. (auth)« less

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    Residual stress states that are a direct result of fabrication and processing are known to exist inside wound capacitors. Considerable insights into the nature of these mechanical and thermomechanical stress states have been gained through the application of analytical prediction capabilities that have been developed for that purpose. For example, analysis shows where roll slip may occur in the capacitor due to steep wound tension gradients or low radial pressures, and how the tension loss of individual plies is distributed throughout the capacitor. Significant tension loss differences between dielectric and conducting plies has also been predicted, with conducting plies notmore » only losing their initial winding tension, but actually experiencing a net compressive value of wound tension. While the results of these predictions are both quantitative and qualitative, only qualitative verification has been obtained thus far, such as visual observation of wrinkled conducting plies discovered in unwrapped capacitors. The purpose of this paper is to describe two experimental activities that were undertaken to support the analytical modeling effort and provide quantitative, experimental verification of some of the analysis predictions.« less