期刊
ENGINEERING FAILURE ANALYSIS
卷 14, 期 8, 页码 1574-1585出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfailanal.2006.12.004
关键词
creep crack initiation; time dependent failure assessment diagram; two criteria diagram; NSW-model
In large components such as rotors defects due to manufacturing processes have to be taken into account and crack assessments based on findings of non-destructive evaluation are necessary. Approaches are used in remaining life estimations, for example: Time Dependent Failure Assessment Diagram (TDFAD), Two Criteria Diagram (2CD) and Nikbin-Smith-Webster-Model (NSW-Model). The TDFAD approach is currently being developed within the R5 procedures as an alternative to conventional methods for predicting incubation and the early stages of Creep Crack growth. A key requirement of TDFAD approaches is the evaluation of a time dependent creep toughness, denoted K-c mat. The 2CD approach has been developed independently in Germany to assess Creep crack incubation in ferritic steels. This approach uses crack tip and ligament damage parameters, R-K and R-sigma, respectively. Furthermore the NSW-Model is employed for the estimation of creep crack initiation by using the creep fracture mechanics parameter C*. Calculations and used parameters were compared for a ferritic 1CrMoV-steel. (c) 2007 Elsevier Ltd. All rights reserved.
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