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论文类型：期刊论文

发表时间：2019-11-01

发表刊物：OCEAN ENGINEERING

收录刊物：EI、SCIE

卷号：191

ISSN号：0029-8018

关键字：Strength criterion; Corrosion defect; Failure pressure; Analytical solution; Corrosion depth; Corrosion width

摘要：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.