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Title: Ductile fracture of X-65 API linepipe under severe loading
Category: Technical papers from the Journal of Pipeline Engineering
Downloadable: Yes 
Catalog No.: 2352s
Date of Publication: 2015-06-01
Price: $25.00 US
Authors: Dr Sirous Yasseri
Abstract: DUCTILE-CRACK INITIATION under large- scale deformation is more likely to happen under extreme loading when flaws are small and material is tough. This paper discusses the stress-modified critical-strain (SMCS) model, and its applications to pipelines subjected to severe deformation such as due to geohazards, denting, dropped objects, or explosion. This paper presents results of investigation of applicability of the SMCS theory to 35 samples taken from an X-65 steel pipe and from the heat- affected zone (HAZ) as well as the weld. The investigation involves experiments and replication of the each experimental result using finite-element analyses. Key findings include the accuracy of the model in predicting ductile fracture in X-65 steel pipe, under severe deformation. The model is also compared with test results available in the technical literature for X-65 and similar steels.
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