0
RESEARCH PAPERS

Effect of Geometry of Grooves on Connection Strength of Hydraulically Expanded Tube-to-Tubesheet Joints

[+] Author and Article Information
H. F. Wang

Department of Mechanical Engineering, Nanjing University of Technology, Nanjing 210009, Chinahfwang99@etang.com

Z. F. Sang

Department of Mechanical Engineering, Nanjing University of Technology, Nanjing 210009, China

J. Pressure Vessel Technol 127(4), 430-435 (Jul 01, 2005) (6 pages) doi:10.1115/1.2061007 History: Received April 19, 2004; Revised July 01, 2005

The object of this paper is to investigate the effect of the geometry of circumferential grooves on the connection strength of hydraulically expanded tube-to-tubesheet joints of heat exchangers. Seven-tube models with different groove widths, depths, spacings, and locations were fabricated under the same expansion pressure by commercial hydraulic expanders. Then the corresponding pullout forces were gained by experimental means. In addition, the process of hydraulic expansion of tube-to-tubesheet joints was simulated using the nonlinear finite element method based on a two-dimensional (2D) axisymmetrical model. The residual stress and deformation of joints were determined, and the effect of geometrical parameters of the grooves on the connection strength of joints was studied in terms of the average residual contact pressure of the joints. The experimental and calculation results indicate that the most important geometrical factor for determining the connection strength is the groove width. Groove depth, spacing, and location have a secondary effect. Optimum geometrical sizes of grooves are proposed based on maximum axial strength. These can provide a reference for the revision of design and manufacturing codes.

FIGURES IN THIS ARTICLE
<>
Copyright © 2005 by American Society of Mechanical Engineers
Topics: Pressure , Geometry , Stress
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Specimens of tubesheet

Grahic Jump Location
Figure 2

Schematic diagram of hydraulic expansion

Grahic Jump Location
Figure 3

Dimension and structure of grooves

Grahic Jump Location
Figure 4

Effect of groove width on connection strength of joints (one groove)

Grahic Jump Location
Figure 5

Effect of groove location on connection strength of joints (one groove)

Grahic Jump Location
Figure 6

Effect of groove depth on connection strength of joints (one groove)

Grahic Jump Location
Figure 7

Effect of groove spacing on connection strength of joints (two grooves)

Grahic Jump Location
Figure 8

2D axisymmetric finite element model

Grahic Jump Location
Figure 9

The residual Von Mises stress: (a) one-groove hole and (b) two-groove hole

Grahic Jump Location
Figure 10

Distribution of residual contact pressure: (a) one-groove hole and (b) two-groove hole

Grahic Jump Location
Figure 11

Effect of groove width on connection strength (one groove)

Grahic Jump Location
Figure 12

Effect of groove location on connection strength (one groove)

Grahic Jump Location
Figure 13

Effect of groove depth on connection strength (one groove)

Grahic Jump Location
Figure 14

Effect of groove spacing on connection strength (two grooves)

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In