Iteration method for directly determining J-resistance curves of nuclear structural steels

Thak Sang Byun, Bong Sang Lee, Ji Hyun Yoon, Jun Hwa Hong

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

An iteration method has been developed for determining crack growth and fracture resistance curves (J-R curves) of nuclear structural steels from the load versus load-line displacement record only. In this method, the hardening curve, the load versus displacement curve at a given crack length, is assumed to be a power-law function, where the exponent varies with the crack length. The exponent is determined by an iterative calculation method with the assumption that the exponent varies linearly with the load-line displacement. The proposed method was applied to the static J-R tests using compact tension (CT) specimens, a three-point bend (TPB) specimen, and a cracked round bar (CRB) specimen as well as it was applied to the quasi-dynamic J-R tests using CT specimens. The J-R curves determined by the proposed method were compared with those obtained by the conventional testing methodologies. The results showed that the J-R curves could be determined directly by the proposed iteration method with sufficient accuracy in the specimens from SA508 and SA516 pressure vessel steels and their welds and SA312 stainless steel.

Original languageEnglish
Pages (from-to)2039-2047
Number of pages9
JournalJournal of Materials Science
Volume34
Issue number9
DOIs
StatePublished - May 1 1999
Externally publishedYes

Funding

This work has been carried out as a part of the Reactor Pressure Boundary Materials Project that has been financially supported by MOST in Korea.

FundersFunder number
Ministry of Science and Technology

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