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Abstract
Most of the existing local approaches for cleavage fracture derive from the assumptions that global failure is a weakest-link event and that only the tail of the size distribution of micro-crack initiating features is significant. This appears to be sufficient in predicting lower shelf toughness under high constraint conditions, but may fail when attempting to predict toughness in the transition region or for low constraint conditions when using the same parameters. While coupled ductile damage models with Beremin-like failure probability could be useful in the transition region, uncoupled models with "a posteriori" probability calculations are advantageous to the engineering community. Cleavage toughness predictions in the transition regime, which can be extended to low constraint conditions, are here made with improved criterion for particle failure and experimentally based size distribution of initiators for specific RPV steel. The model is shown to predict experimentally measured locations of cleavage initiators. Further, the model predicts the fracture toughness in a large part of the transition region and accurately predicts a measured shift with irradiation. All results are obtained without changes in model parameters. This suggests that the model can be used for assessing toughness changes due to constraint- And temperature-driven plasticity changes. Copyright © (2013) by International Conference on Fracture.
Original language | English |
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Title of host publication | 13th International Conference on Fracture 2013, ICF 2013|Int. Conf. Fract., ICF |
Place of Publication | Beijing |
Publisher | Chinese Society of Theoretical and Applied Mechanics |
Pages | 5591-5600 |
Number of pages | 9 |
Volume | 7 |
Publication status | Published - 2013 |
Event | 13th International Conference on Fracture 2013, ICF 2013 - Beijing, China Duration: 16 Jun 2013 → 21 Jun 2013 |
Conference
Conference | 13th International Conference on Fracture 2013, ICF 2013 |
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Country/Territory | China |
City | Beijing |
Period | 16/06/13 → 21/06/13 |
Keywords
- Global failure probability
- Local failure criterion
- RPV steel
- Transition temperature regime
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Dive into the research topics of 'Cleavage modelling with experimental particle size distribution and novel particle failure criterion'. Together they form a unique fingerprint.Activities
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Cleavage modelling with experimental particle size distribution and novel particle failure criterion
Jivkov, A. (Speaker)
18 Jun 2013Activity: Talk or presentation › Oral presentation › Research