A further development of the Battelle two curve method (BTCM) used to determine the minimum of fracture arrest toughness of the pipeline material is presented in the paper. The crack propagation velocity model is incorporated into the proposed one-dimensional transient mathematical model of compressible thermal multi-component natural gas mixture flow in a shock tube, which is used to simulate a rapid decompression of the natural gases. The dynamic pressure at the crack tip is determined numerically using the proposed mathematical model of gas decompression. The set of the mass, momentum and enthalpy conservation equations is solved for the gas phase. Thermo-physical properties of multi-component gas mixture are calculated by solving the equation of state (EOS) in the form of the Soave-Redlich-Kwong (SRK-EOS) model. The decompression model was successfully validated against the experiments where the decompression wave speed in natural gases was measured. The proposed numerical approach simulates a continuous development of crack propagation together with rapid decompression process of the natural gas, and it's arrest (or not) in some time. The HLP and the Battelle crack propagation velocity models are considered and compared with each other. The performance of both crack velocity models is analyzed in the paper.
Approaches to modeling of the fracture propagation control
Näherungen für die Modellierung der Bruchfortschrittskontrolle
2013
7 Seiten, 5 Bilder, 1 Tabelle, 29 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
Pipeline , Stahlrohr , Bruchzähigkeit , Rissstopp , Rissausbreitung , Ausbreitungsgeschwindigkeit , mathematisches Modell , Erdgasfernleitung , kompressible Flüssigkeitsströmung , Rissspitze , dynamische Belastung , numerische Analyse , Gasmischung , Zustandsgleichung , Dekompression , Druckwelle , Simulationsmodell
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