A new method for assessing high temperature crack growth

AJ Fookes, DJ Smith

Research output: Contribution to journalArticle (Academic Journal)

3 Citations (Scopus)

Abstract

Experimental creep crack growth (CCG) test data are obtained by following standards that characterize CCG rates using the C* parameter. Such data are then used in high-temperature failure assessment procedures. An alternative approach to defect assessment at high-temperature failure is an extension of the R6 failure assessment diagram (FAD). At high temperature, creep toughness, Kcmat, can be estimated from CCG tests and replaces low-temperature toughness in R6. This approach has the advantage that it is not necessary to establish a creep fracture regime, such as small-scale, primary or widespread creep. Also, a new strain-based FAD has been developed, potentially allowing variations of stress and temperature to be accommodated. In this paper, the results of a series of crack growth tests performed on ex-service 316H stainless steel at 550 °C are examined in the light of the limitations imposed by ASTM for CCG testing. The results are then explored in terms of toughness and presented in FADs.
Translated title of the contributionA new method for assessing high temperature crack growth
Original languageEnglish
Pages (from-to)769 - 778
JournalFatigue and Fracture of Engineering Materials and Structures
Volume28
DOIs
Publication statusPublished - Sep 2005

Bibliographical note

Publisher: Blackwell

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