Projects per year
Abstract
Local approaches (LA) to cleavage fracture incorporate microstructure information and failure mechanisms into mathematical models for calculation of component failure probability. They offer a promising mechanistic alternative to global approaches and have been successfully applied to predict cleavage fracture toughness (CFT) changes due to material degradation and geometry effects. Predicting the dependence of CFT on temperature, specifically in the ductile-to-brittle transition (DBT) regime, remains a challenge. This work offers one avenue for addressing the challenge by revisiting the mathematical basis of LA and demonstrating that changes in continuum mechanical fields due to changes of deformation properties with temperature are insufficient to deliver predictions in agreement with experimentally measured CFT dependence on temperature. This suggests that the process by which cleavage initiators are generated is dependent on temperature separately from the dependence of the deformation properties on temperature. The temperature dependence of the generation process is derived for the material studied in the work. A methodology is described for predicting CFT in the DBT regime, using deformation and fracture toughness properties at one temperature and deformation properties at any other temperature of interest.
Original language | English |
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Pages (from-to) | 39-44 |
Journal | Procedia Structural Integrity |
Volume | 23 |
DOIs | |
Publication status | Published - 15 Dec 2019 |
Keywords
- Ferritic steels; Cleavage fracture; Ductile-to-brittle transition; Local approach
Fingerprint
Dive into the research topics of 'Progress and challenges with local approaches to cleavage fracture'. Together they form a unique fingerprint.Projects
- 1 Finished
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Geometric Mechanics of Solids: new analysis of modern engineering materials - GEMS
Jivkov, A. (PI) & Margetts, L. (CoI)
1/11/16 → 31/10/21
Project: Research
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A probabilistic approach for cleavage fracture including the statistics of microcracks: Application to a reactor pressure vessel steel
Ruggieri, C. & Jivkov, A. P., 1 Sept 2022, In: Engineering Fracture Mechanics. 272, 15 p., 108702.Research output: Contribution to journal › Article › peer-review
Open AccessFile82 Downloads (Pure) -
Capturing the Temperature Dependence of Cleavage Fracture Toughness in the Ductile-to-Brittle Transition Regime in Ferritic Steels using an Improved Engineering Local Approach
Yankova, M., Jivkov, A., Patel, R. & Sherry, A. H., 1 Jun 2022, In: Journal of Pressure Vessel Technology, Transactions of the ASME. 144, 3, 10 p., 031503.Research output: Contribution to journal › Article › peer-review
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Incorporation of obstacle hardening into local approach to cleavage fracture to predict temperature effects in the ductile to brittle transition regime
Yankova, M., Jivkov, A. & Patel, R., 5 Mar 2021, In: Materials. 14, 5, p. 1-12 12 p., 1224.Research output: Contribution to journal › Article › peer-review
Open AccessFile87 Downloads (Pure)
Activities
- 1 Invited talk
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Progress and challenges with local approaches to cleavage fracture
Jivkov, A. (Speaker)
26 Jun 2019Activity: Talk or presentation › Invited talk › Research