The studies presented in this dissertation investigated the characteristics of dynamic ductile crack propagation and arrest in a pressurized pipeline, and developed an improved model for providing more reliable and economical design guidelines. This research was able to device and perform model scale ductile pipe rupture experiment. The quantitative results include crack velocity, depressurization history, crack opening and near tip crack tip opening angle (CTOA), and strain history. Experiments on investigation pipe flap constraint effect confirm that the driving force comes from the pressure on the fractured flap behind and very near the crack tip. An experimentally observed and measured CTOA versus crack velocity relationship justify the use of CTOA as propagating ductile pipe fracture criterion. A Split Ring Model, based on a force analysis and experimentally/numerically incorporated plastic energy dissipation, was developed which successfully prodict the full scale pipe fracture. The model also shows the capability of predicting the effect of pipe flap constraint. The characteristic curve predicted by the model, CTOA versus crack velocity, for a specific pipe configuration and operating conditions can be used to ensure a self-arrest pipe fracture.
A propagating ductile model for a pressurized pipeline
Modell eines sich ausbreitenden duktilen Bruchs fuer eine Druckrohrleitung
1987
214 Seiten
Theses
English
A study of ductile crack propagation in gas pressurized pipelines
Tema Archive | 1974
|Wounding Composite Pipeline with Internally Pressurized Conditions
Tema Archive | 2013
|Numerical Investigation of the Leakage Flow from a Pressurized CO2 Pipeline
Tema Archive | 2014
|The effect of prestrain on ductile fracture toughness of reeled pipeline steels
Tema Archive | 2011
|