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A PROCEDURE FOR ANALYSIS OF LEAK BEFORE BREAK IN PIPES SUBJECTED TO FATIGUE OR IGSCC ACCOUNTING FOR COMPLEX CRACK SHAPES
Author(s) -
Bergman M.,
Brickstad B.
Publication year - 1995
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1995.tb00846.x
Subject(s) - leak , residual stress , materials science , structural engineering , crack closure , paris' law , fatigue testing , stress concentration , fracture mechanics , leakage (economics) , residual , welding , mechanism (biology) , forensic engineering , engineering , composite material , computer science , philosophy , epistemology , algorithm , environmental engineering , economics , macroeconomics
A procedure is described which predicts the growth of an initial circumferential surface crack through a pipe wall and further on to final failure of the pipe. The crack growth mechanism can either be fatigue or stress corrosion. Consideration is taken to complex crack shapes, since especially the last growth mechanism often results in a substantially longer crack length on the inside of the pipe than on the outside for the initial leaking crack due to the distribution of weld residual stresses. The procedure has been implemented in a computer program that in an integrated fashion calculates crack sizes and mass leak rates as a function of time and also predicts when leakage and final failure occur. The information obtained makes it possible to judge if the concept of leak before break is fulfilled.