Failure Assessment Research of Flawed Ductile Metals Used in Nuclear Plant
| Autor: | Rui Liu, Lijing Wen, Tieping Li |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Materials science
business.industry Tension (physics) Crack tip opening displacement Internal pressure General Medicine Structural engineering Gurson model Plastic limit load Finite element method Integrity assessment of nuclear pipelines Crack closure Fracture toughness business Failure assessment Displacement (fluid) Engineering(all) |
| Zdroj: | Procedia Engineering. 43:101-107 |
| ISSN: | 1877-7058 |
| DOI: | 10.1016/j.proeng.2012.08.018 |
| Popis: | A new method based on Gurson model to estimate plastic collapse failure for flawed high energy pipelines is put forward. First, standard fracture toughness measurement is explored on contact tension specimen made of ductile metal of S355. With increasing load, crack tip collapse occurs instead of crack extension, and local yielding appears around crack tip not the whole ligament, which coincides with recent research that NSC (neck-section-collapse) overestimates structure loading capability. From the test results, a method based on J-P curves is used to estimate collapse loads for contact tension specimen with different crack length. Second, tension process of contact tension specimen is simulated by finite element method combining with Gurson model, which is proved to simulate structure plastic failure well. Then, Gurson model is adapted to simulate failure process of circumferential cracked pipeline made of S355 with internal pressure. Finally, relationship between crack length and collapse CMOD (crack mouth opening displacement) is built, which is important for integrity assessment of nuclear pipelines. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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