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An Approach to Modification of Compact Tension J-R Curves for Analysis of Surface Cracked Pipe Stability

[+] Author Affiliations
Richard Olson

Battelle Memorial Institute, Columbus, OH

Paper No. PVP2016-63170, pp. V003T03A071; 8 pages
doi:10.1115/PVP2016-63170
From:
  • ASME 2016 Pressure Vessels and Piping Conference
  • Volume 3: Design and Analysis
  • Vancouver, British Columbia, Canada, July 17–21, 2016
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-5039-8
  • Copyright © 2016 by ASME

abstract

It is well known that J-R curves from C(T) specimens do not have the correct constraint for surface cracked (SC) pipes. More appropriately, fracture toughness for surface cracked pipes is better characterized by two-parameter models where toughness is not a single value like J, but rather is a curve that defines a critical locus of fracture toughness and constraint values. Unfortunately, for the vast majority of situations, toughness property data for pipe fracture analyses using elastic-plastic fracture mechanics (EPFM) J-estimation scheme techniques to assess the load carrying capacity of the cracked pipe section, consist only of C(T) specimen J-R curves. The alternatives, when analyzing a surface crack, are to simply use the C(T) data and live with the consequences or else perform the analysis using some sort of “correction” applied to the C(T) specimen data to get better predictions of surface crack stability.

This paper examines the feasibility of using a correction to a C(T) specimen J-R curve to yield better predictions of the load carrying capacity of surface cracked pipe. The analyses discussed herein are constrained by: a) The availability and limitations of analytical models of the relevant phenomenon, and b) The availability of experimental pipe fracture data to test hypotheses about the form of a “correction”. Within these constraints, an initial estimate of a “correction” has been developed and is tested against some surface crack pipe experimental data.

Copyright © 2016 by ASME
Topics: Stability , Pipes , Tension

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