الفهرس 
Linear Elastic Fracture Mechanics (LEFM)
Chemical AnalysisOnly 14 pages are availabe for public view
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Abstract
The current work is focused on studying the Fracture assessment of steels pipe with different grades. The research is divided into two parts. The first part is focused on determination of the fracture energy for materials used in natural gas pipelines. Double edge notch tension (DENT) samples with different ligament lengths of each pipe thickness were tested in tension to determine the fracture energy of each material. Increasing the pipe thickness increased the essential work of fracture. The results have a qualitative agreement with previous work.
The second part is studying the fracture toughness on full scale steel pipes under internal pressure with axial partially-through crack using two analytical methods Folin-Ciocalteu method (FC method) and Gauss–Seidel method (GS method). In this work, a comparison is made between results obtained from FC and GS methods. The GS is more conservative assessment method as it provides smaller crack depth (a) corresponding to (Jcr). In addition, Finite Element model was established to simulate the crack propagation in full scale pipe. Generally, Finite Element model is almost more conservative than the analytical methods and its results close to the experimental values.