A quasi-static analysis is presented in this paper for in-service pressurised pipelines subjected to an external impact. Based on the assumed simple rigid, perfectly plastic deformation model, a simple relationship is obtained between the external denting force F and the maximum dent depth delta0. Results from the theoretical analysis are in reasonable agreement with results from finite element analyses. These show that the pressure p=pin-pout has a large influence on the pipe resistance to the indentation, where pin and pout are the internal and external pressure, respectively. For the same dent depth, a higher external denting force is required for pipes with higher pressure, p. The difference of the required force between a lowly pressurised pipe and a highly pressurised pipe increases with increasing denting depth.
Theoretical analysis of local indentation on pressured pipes
International Journal of Pressure Vessels and Piping ; 81 , 12 ; 931-939
2004
9 Seiten, 7 Quellen
Article (Journal)
English
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