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Modeling for ductile-to-brittle transition under ductile crack growth for reactor pressure vessel steels |
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| Affiliation: | 1. Institute of Electronics Packaging Technology and Reliability, College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China;2. Department of Engineering Mechanics, AML, Tsinghua University, Beijing 100084, China;3. Department of Mechanical Engineering, University of South Carolina, 300 S. Main Street Columbia, SC 29208, United States;4. Department of Mechanical & Aerospace Engineering, University of Strathclyde, Glasgow G1 1XJ, UK |
| Abstract: | The local stress–strain state (SSS) near the crack tip is investigated by the finite element method in the finite strain statement (with regard to a change of the crack tip blunting) for both stationary cracks and crack growing by a ductile mechanism. Using the revealed particularities of SSS near the stationary and growing crack tips and the local cleavage fracture criterion the phenomenon of the ductile-to-brittle transition is explained for reactor pressure vessel steels. The model is proposed to predict the amount of ductile crack extension preceding the ductile-to-brittle transition as a function of the test temperature. The procedure for calculation of the cleavage fracture toughness is also elaborated with regard to ductile crack extensions. Analysis of the obtained calculated results and available experimental data is made. Alternative approaches for the interpretation of the ductile-to-brittle transition are discussed. |
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