Reference Stress Approach for Fracture Assessment of Extrados Circumferential Through-Wall Crack at the Interface between Elbow and Pipe Subjected to Internal Pressure

  • Jirapong Kasivitamnuay Chulalongkorn University
  • Pairod Singhatanadgid Chulalongkorn University

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Abstract

The fracture assessment of a cracked component can provide a technical support for an effective maintenance and a prevention of catastrophic accident. The present study applies the reference stress method to extend the J-integral solution from the finite element analysis for the Ramberg-Osgood stress-strain relationship to other types of stress-strain relationship. The problem in this study is an extrados circumferential through-wall crack at the interface between elbow and pipe subjected to internal pressure. The finite element results from the literature were analyzed to determine the optimized reference pressure. The reference-stress-based failure assessment curve which incorporated with the obtained reference pressure can be used to estimate the finite-element-based failure assessment curve with a sufficient accuracy in fracture assessment. The failure load predicted from the reference-stress-based failure assessment curve deviated from that predicted from the finite-element-based failure assessment curve within the range of -7% to 11%.

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Author Biographies
Jirapong Kasivitamnuay Department of Mechnical Engineering, Faculty of Engineering, Chulalongkorn University Pairod Singhatanadgid

Department of Mechanical Engineering, Faculty of Engineering, Chulalongkorn University

Published
Vol 22 No 6, Dec 4, 2018
How to Cite
J. Kasivitamnuay and P. Singhatanadgid, “Reference Stress Approach for Fracture Assessment of Extrados Circumferential Through-Wall Crack at the Interface between Elbow and Pipe Subjected to Internal Pressure”, Eng. J., vol. 22, no. 6, pp. 151-163, Dec. 2018.

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