It is well understood that fracture toughness is dependent on the crack tip constraint and testing results from single edge notch bending specimens (SENB) are too conservative for engineering critical assessment of cracked pipelines, which are characterized by thin wall thickness and relatively high toughness. There is a general trend in the pipeline industry to accept the single edge notch tension specimen (SENT) as an alterative testing specimen for better fracture assessment of both virgin and pre-strained and welded pipelines. This paper will summarize the vast experience in the last decade in Norway and present the latest systematic numerical and experimental results on the development of a SENT methodology for pipeline applications. It includes the following aspects: the theoretical background for the SENT methodology; selection criterion and the technique to fine-tune the crack tip constraint of a SENT geometry to represent the cracked pipes; effect of weld metal mismatch and misalignment; effect of internal pressure on the fracture resistance of a pipe; size dependence and independence of the SENT fracture resistance curves. The paper will end by discussing the limitation and application windows of the SENT methodology.
SENT (Single Edge Notch Tension) Methodology for Pipeline Applications
Prüftechnische Gesichtspunkte zur einseitig gekerbten Zugprobe für Pipeline-Anwendungen
2010
8 Seiten, 7 Bilder, 16 Quellen
Conference paper
English
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