Sensitivity of reliability-based fatigue analysis to crack shape development in cracked pipeline

• Type: Article in International Conference Proceedings Book
• Date: 2019

Authors

Guillal A. (Author) Other; Abdelbaki N. (Author) Other; Seghier M.E.A.B. (Author) Other; Correia J.A.F.O. (Author) FEUP; Abilio M P De Jesus (Author) FEUP; Zhu S.P. (Author) Other

Conference proceedings International

Title: Procedia Structural Integrity

Pages: 201-210

3rd International Conference on Structural Integrity, ICSI 2019

2 September 2019 through 5 September 2019

Indexing

Scopus - 4 Citations

Other information

Authenticus ID: P-00Y-BBH

DOI: 10.1016/j.prostr.2020.01.026

Abstract (EN): An accurate prediction of crack shape development during fatigue propagation plays a key role in structural reliability assessment. To predict crack shape, aspect ratio variability (a/c; a: crack depth, c: half crack length) is wildly used and different correlations to estimate this later exist in literature. In this paper, reliability index of a pipeline with axially surface crack is evaluated. Initial aspect ratio was varied. Tow dimensional crack growth models based on Paris Law coupled to liner elastic fracture mechanics were used. The objective is to clarify the effect of initial aspect ratio and it variability during propagation on the life time prediction of cracked pipeline. Based on Importance sampling, reliability index is plotted against number of load cycle. Results show an important role of initial aspect ratio and crack growth model in reliability index estimation. Calculation of different sensitivity factors illustrates the effect of uncertainty and correlation of Paris law parameters on the predicted life time of the pipeline.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9