In order to find alternative technique for measurement fracture toughness of already delivered pipeline segment, the new pipe-ring specimen has been proposed. Paper provides limit load solutions for pipe-ring containing two diametrical symmetric cracks with same depth ratio in range of 0.45≤a/W≤0.55. The limit load analysis was performed by finite element calculations with reduced integration element and work hardening material employed in the computations. The variation of outside radius of pipe-ring specimen has negligible effect on the limit load, if R/W=4 and W/B=2 are constants for crack depth ratio 0.45≤a/W≤0.55. A developed new limit load expression leads to limit load values prior crack initiation and stable crack growth. The limit load results are given regarding to yielding solution for non-cracked pipering specimen Fy0. The limit load solution is crucial for structure integrity assessment by using Failure Assessment Diagram (FAD) or Crack Driving Force (CDF) concepts. It provides also possibility for structure integrity assessment of different structural components by using fracture toughness testing results obtained on new pipe-ring specimen. The same approach is going to apply for limit load solutions with vary of different ratios R/W, W/B and crack depth a/W.
Determination of limit loads for new pipe-ring specimens
2013
7 Seiten, 6 Bilder, 1 Tabelle, 11 Quellen
Conference paper
English
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