Application of the local fracture stress model on the cleavage fracture of the reactor pressure vessel steels in the transition temperature region

Won J. Yang, Bong Sang Lee, Moo Young Huh, Jun H. Hong

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The fracture toughness in the ductile-brittle transition region of reactor pressure vessel steels was evaluated by means of an RKR-type model which describes the temperature dependence of the cleavage fracture toughness based on the constant fracture stress σf. The fracture stress σf and the characteristic distance are two main parameters in the RKR model. In order to apply the RKR model to the transition temperature region, these two parameters were investigated in different manners. In this study, the local fracture stress, σf*, was determined from the pre-cracked specimens. The results showed that the local fracture stress σf* determined from the pre-cracked specimens was higher than the fracture stress σf from the notched specimens, while those values were practically independent of the temperatures. The CID (cleavage initiation distance), which represents the distance from the crack tip to the cleavage initiation site, was measured in every fractured specimen. The measured CID values were strongly dependent on the test temperatures. Besides, the fracture toughness KJC in the transition region was dependent on the measured CID. The RKR model, when the local fracture stress σf* and the measured CIDs were applied, could describe the temperature dependency of the median transition fracture toughness KJC(med).

Original languageEnglish
Pages (from-to)234-242
Number of pages9
JournalJournal of Nuclear Materials
Volume317
Issue number2-3
DOIs
Publication statusPublished - 2003 May 1

Fingerprint

pressure vessels
Steel structures
Superconducting transition temperature
cleavage
transition temperature
reactors
steels
fracture strength
Fracture toughness
charge injection devices
ductile-brittle transition
Temperature
crack tips
Crack tips
temperature
temperature dependence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Application of the local fracture stress model on the cleavage fracture of the reactor pressure vessel steels in the transition temperature region. / Yang, Won J.; Lee, Bong Sang; Huh, Moo Young; Hong, Jun H.

In: Journal of Nuclear Materials, Vol. 317, No. 2-3, 01.05.2003, p. 234-242.

Research output: Contribution to journalArticle

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