PREDICTION OF ARREST PRESSURE IN PIPE BASED ON CTOA
Résumé
Crack extension modelled by Finite Element method using CTOA criterion coupled with the the node release technique is used to predict the crack velocity, the arrest pressure and crack length. This method is compared with the different Two Curves Methods Batelle, HLP and HLP-Sumitomo and is close to the last one for two pipe steels API5L X65 and X100. Influence of pipe thickness is studied through the concept of triaxial stress constraint. This method confirms also that the arrest pressure decreases exponentially with the square root of the diameter.
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