期刊
ENGINEERING FRACTURE MECHANICS
卷 116, 期 -, 页码 41-57出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2013.12.015
关键词
Creep constraint; Load independence; Finite element; Creep crack growth; Application
类别
资金
- Projects of the National Natural Science Foundation of China [51375165, 51325504]
- National High Technology Research and Development Program of China [2012AA040103]
A load-independent creep constraint parameter R* was proposed, and its load-independence was validated using finite element results in previous studies. A fixed distance r = 0.2 mm from a crack tip is chosen to define the R, and the R* at steady-state creep can be used to evaluate constraint level with little conservatism for whole creep time. The R can be used for ranking constraint levels for different specimens or components, and for predicting constraint-dependent creep crack growth rates. The constraint-dependent creep crack growth rate equations of a Cr-Mo-V steel have been obtained, and it may be used in creep life assessments. (C) 2013 Elsevier Ltd. All rights reserved.
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