Axial Strength of Tube-to-Tubesheet Joints: Finite Element and Experimental Evaluations

[+] Author and Article Information
M. Allam

Research and Development Engineering, Pratt & Whitney, Middletown, CT 06457e-mail: allamm@pweh.com

A. Bazergui

Ecole Polytechnique of Montreal, Montreal, Quebec H3C 3A7 Canadae-mail: andre.bazergui@innovitech.com

J. Pressure Vessel Technol 124(1), 22-31 (May 22, 2001) (10 pages) doi:10.1115/1.1398555 History: Received June 14, 1999; Revised May 22, 2001
Copyright © 2002 by ASME
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Joint axial strength as predicted by different analytical models
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Three different ways of evaluating the joint axial strength by the FE method
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3-D finite element model
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Axisymmetric finite element model
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Typical relation between shearing force and tube micro-motion
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Tube and tubesheet frictional test specimens
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Experimental friction test setup—1-two tube specimens, 2-apparatus support, 3-two tubesheet specimens, 4-movable frame, 5-known weight, 6-load gaging cell, 7-linear spring, 8-3-D arm, 9-displacement transducer, 10-X-Y plotter
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Typical relation between shearing force and displacement
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Local coefficient of friction versus normal pressure
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Photograph of test sample, rigid ball, and locking cylinder
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Illustration of pull-out test setup—1-steel cylinder, 2-sleeve, 3-MTS lower arm, 4-displacement cell, 5-steel rod, 6-load transducer, 7-displacement cell (under MTS upper arm), 8-microcomputer, 9-printer
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Typical relation between shearing and relative displacement (CASE: 1-1)
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Relation between shearing force and relative displacement as given by MTS displacement cell and Mμ-checker (CASE: 2-2)
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Relation between shearing force and relative displacements given by FE solution (CASE: 1-1)
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Relation between joint axial strength and initial residual contact pressure as predicted by the FE analysis
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Statistical relation between interference contact pressure (VAR2) and initial residual contact pressure (VAR1)




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