Hits:

Indexed by:Journal Papers

Date of Publication:2019-11-01

Journal:OCEAN ENGINEERING

Included Journals:EI、SCIE

Volume:191

ISSN No.:0029-8018

Key Words:Strength criterion; Corrosion defect; Failure pressure; Analytical solution; Corrosion depth; Corrosion width

Abstract:Corrosion assessment analysis and failure pressure prediction of pipelines with corrosion defects are essential in the integrity assessment of transmission pipelines. A series of semi-empirical corrosion criteria have been proposed to predict the failure pressure. However, the influence of defect width on the failure pressure is not considered in theory. In this paper, an improved model for the end-capped pipe with infinite length defect is developed based on plastic instability theory and finite strain theory, by considering the corrosion depth and width. The constitutive behavior of the pipe steel material is characterized by a power-law hardening stress-strain curve. Thus, two theoretical solutions are developed based on von Mises and Tresca criteria, by considering the strain hardening effect. Finite element analysis and sixty-one full-scale burst tests for each pipe with a single longitudinal defect are performed to validate and define the application scope of these new solutions. The results show that the proposed model based on von Mises criterion makes the best prediction and is suitable for the cases of defect length longer than root 20Dt.