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Comparison of Methods for Calculating Stress Intensity Factors for a Closure Thread

[+] Author Affiliations
David P. Kendall

Consultant, Troy, NY

Paper No. PVP2002-1161, pp. 27-30; 4 pages
  • ASME 2002 Pressure Vessels and Piping Conference
  • High Pressure Technology
  • Vancouver, BC, Canada, August 5–9, 2002
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-1947-7
  • Copyright © 2002 by ASME


Non-mandatory Appendix D of Section VIII, Division 3 of the ASME Boiler and Pressure Vessel Code [2] provides a method for calculating the stress intensity factors for the region of a thread root of a threaded closure. This method involves calculation of the distribution of stress acting on a plane normal to the axis of the thread. This distribution is fitted with several different cubic equations for different regions and the coefficients of these cubic equations are entered into an equation to calculate the distribution of stress intensity factor for each region. The values of stress intensity factor for each region after the first one are shifted to obtain a continuous distribution. Neubrand and Burns, 1999 [1] determined the distribution of stress intensity factor for a specific closure thread using weight function methods. In the present paper the stress intensity factors for this same closure design were calculated using the method from Appendix D of Division 3 as described above. Distributions are also calculated using a proposed modification of this method, and also by the method given in Appendix D for cracks in areas of the vessel at which the gradient of the stress distribution is less steep.

Copyright © 2002 by ASME
Topics: Stress , Thread



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