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Evaluation of Fracture Toughness Characteristic for Nuclear Piping Using Various Types of Specimens

[+] Author Affiliations
Soo Park, Sang-soo Yoo, Jun-ki Min, Jae-Mean Koo, Chang-Sung Seok

Sungkyunkwan University, Suwon, Gyeonggi, Korea

Paper No. PVP2010-25540, pp. 1195-1202; 8 pages
doi:10.1115/PVP2010-25540
From:
  • ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference
  • ASME 2010 Pressure Vessels and Piping Conference: Volume 6, Parts A and B
  • Bellevue, Washington, USA, July 18–22, 2010
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-49255 | eISBN: 978-0-7918-3878-5
  • Copyright © 2010 by ASME

abstract

The leak-before-break (LBB) concept is based on the fracture resistance curve obtained by J-R tests on various types of specimens. But it has been also known that the fracture toughness data by various types of specimens are different each other. For example, the estimates for fracture toughness of standard specimens are conservative when compared to the fracture toughness of real pipes owing to the difference of the constraint effect between real pipes and standard specimens. Therefore for estimating the integrity of real pipes on the basis of elastic-plastic fracture mechanics, we have to first establish the relations among real pipes, standard CT specimens and curved CT specimens. In this study, we performed the fracture toughness tests for nuclear piping material by various types of specimen. And each J-R curve considered in the constraint effect was compared.

Copyright © 2010 by ASME

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