Damage-reliability approach for fatigue crack propagation in MDPE gas pipe
| Autor: | Khaoula BERKAS, Kamel CHAOUI |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | International Journal of Applied Mechanics and Engineering, Vol 28, Iss 3, Pp 42-52 (2023) |
| Druh dokumentu: | article |
| ISSN: | 1734-4492 2353-9003 |
| DOI: | 10.59441/ijame/172897 |
| Popis: | Fatigue crack propagation tests are carried out on arc-shaped specimens prepared from MDPE gas pipes. Damage zone characterization is achieved using the diamond wafer sectioning technique from partially propagated and prematurely arrested cracks. Damage ahead of the crack-tip is used to assess a damage parameter and reliability based on statistical laws and subsequent use the PHIMECA Software. It is shown that a length and a width associated with a corresponding change in thickness at the fracture surface satisfactorily describe the damage zone size. The 3-parameter Weibull model gives the best reliability behavior and a critical lifetime of 82%. When considering separately both the Dugdale model and experimental damage zone measurements, it is possible to establish the evolution of the reliability index as a function of crack length. It is concluded that the reliability index approach based on damage provides a more consistent representation compared to analytical models. |
| Databáze: | Directory of Open Access Journals |
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