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Title: Fracture-resistance testing of pipeline girth welds using bend and tensile fracture specimens
Category: Technical papers from the Journal of Pipeline Engineering
Downloadable: Yes 
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Catalog No.: 2299s
Date of Publication: 2013-09-01
Price: $25.00 US
Authors: Prof. Claudio Ruggieri and Leonardo L S Mathias
Abstract: STRUCTURAL-INTEGRITY ASSESSMENTS of pipe girth welds play a key role in the design and safe operation of pipeline systems. Current practices for structural-integrity assessments advocate the use of geometry dependent resistance curves so that crack tip constraint in both the test specimen and the structural component is similar. Thus, testing standards now under development to measure fracture resistance of pipeline steels often employ single edge-notched (SE(T)) specimens under tension. This paper presents an investigation of the ductile-tearing properties for a girth weld of an API 5L X- 80 pipeline steel using experimentally measured crack-growth-resistance curves (also termed J-R curves). Testing of the girthweld pipeline steels employed clamped SE(T) specimens and three-point bend (SE(B)) specimens with weld centreline cracks to determine the J-resistance curves. The experimental toughness data enables further evaluation of crack growth resistance properties of pipeline girth welds.
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