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Title: Modelling crack propagation and arrest in gas pipes using the CTOA criterion
Category: Technical papers from the Journal of Pipeline Engineering
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: 2392s
Date of Publication: 2016-12-01
Price: $25.00 US
Authors: Dr Mohamed Ben Amara, Prof. Guy Pluvinage, Dr Julien Capelle, and Prof. Zitouni Azari
Abstract: ON THE ASSUMPTION THAT the fracture toughness and driving force can be expressed using the crack-propagation velocity and decompression wave speed, the gas pipeline standard codes, such as ASME B31.8, require a minimum toughness in term of the Charpy or DWTT energy to ensure ductile-fracture arrest. This approach involves the superposition of two curves: the gas-decompression-wave speed and the ductile characteristic fracture-propagation velocity, each as a function of the local gas pressure. For this reason, it is called the two-curve method (TCM). The most commonly used TCMs for crack-arrest problems are semi- empirical uncoupled models such as the Battelle method. This model is based on theoretical analysis and full-scale crack-arrest experiments. With the appearance of numerical simulations for ductile-crack extension based on the Gurson-Tvergaard-Needleman model, and critical damage given by strain-rate- dependent damage (SRDD) model or a critical crack-opening angle (CTOA), several authors tended to extend the TCM approach by using numerical analysis of pipeline crack-arrest-simulation results. Well known as a single parameter with low sensitivity to pipe geometry, the CTOA fracture criterion was used to perform a running-ductile-fracture simulation of pipeline made from API 5L X-65 steel. Then, a new arrest pressure equation base on critical CTOA, similar to the BTCM’s equation, was proposed and compared to a commonly used one, such as Battelle-TCM, HLP, and HLP-Sumitomo methods.
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