Damage-reliability approach for fatigue crack propagation in MDPE gas pipe

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 dam...

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Bibliographic Details
Published in:International Journal of Applied Mechanics and Engineering 2023-09, Vol.28 (3), p.42-52
Main Authors: BERKAS, Khaoula, CHAOUI, Kamel
Format: Article
Language:English
Subjects:
damage zone
fatigue crack propagation
limit state function
mdpe gas pipe
reliability index
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Summary: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.
ISSN:1734-4492
2353-9003
DOI:10.59441/ijame/172897