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High temperature fracture parameter for a weld interface crack
- Issue Date
- Jul-1999
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- crack; creep; weld; interface; high temperature
- Citation
- THEORETICAL AND APPLIED FRACTURE MECHANICS, v.32, no.1, pp 27 - 35
- Pages
- 9
- Journal Title
- THEORETICAL AND APPLIED FRACTURE MECHANICS
- Volume
- 32
- Number
- 1
- Start Page
- 27
- End Page
- 35
- ISSN
- 0167-8442
- Abstract
- A fracture parameter is introduced to characterize crack growth at elevated temperature for a weld interface crack. Finite element analyses are made for a compact tension (CT) specimen under constant load where an interface is modeled along the crack plane to simulate the dividing line of the weld metal (WM) and base metal (BM). A constitutive relation for an elastic-creeping material is used. The proposed time dependent fracture parameter is obtained for different creep constants of WM and BM. A transition time and fracture parameter for the homogeneous and welded specimens are defined such that the results can be normalized and presented in a general form for assessing the crack growth life. (C) 1999 Elsevier Science Ltd. All rights reserved.
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