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51313-02858-Application of Plastic Strain Damage Models to Characterize Dent with Crack

Picture for Application of Plastic Strain Damage Models to Characterize Dent with Crack
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Product Number: 51313-02858-SG
ISBN: 02858 2013 CP
Author: Ming Gao
Publication Date: 2013
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Currently the allowable strain limit for a plain dent is 6 percent as per ASME B31.8. Field experience has shown that the 6% strain limit for plain dents could be overly conservative which can result in unnecessary excavations and repairs. Recently efforts to develop an alternative strain limit have been proposed.

In this paper two plastic damage based models (namely ductile failure damage and strain limit damage) and one minimum elongation based criterion are reviewed. Attempts have been made to use these models to characterize rock dents with associated cracks in terms of a plastic damage severity factor and its susceptibility to crack initiation. Field excavations and finite element analysis are utilized for model validation. The results have shown that the internal cracks were formed at the time of the initial indentation and can be predicted by the plastic strain damage based ductile failure models. On the basis of the model a newly developed approach that combines ILI technologies is introduced and utilized to discriminate between dent with corrosion and dent with crack and identify critical dents in the pipelines. Examples are given for illustration.

Currently the allowable strain limit for a plain dent is 6 percent as per ASME B31.8. Field experience has shown that the 6% strain limit for plain dents could be overly conservative which can result in unnecessary excavations and repairs. Recently efforts to develop an alternative strain limit have been proposed.

In this paper two plastic damage based models (namely ductile failure damage and strain limit damage) and one minimum elongation based criterion are reviewed. Attempts have been made to use these models to characterize rock dents with associated cracks in terms of a plastic damage severity factor and its susceptibility to crack initiation. Field excavations and finite element analysis are utilized for model validation. The results have shown that the internal cracks were formed at the time of the initial indentation and can be predicted by the plastic strain damage based ductile failure models. On the basis of the model a newly developed approach that combines ILI technologies is introduced and utilized to discriminate between dent with corrosion and dent with crack and identify critical dents in the pipelines. Examples are given for illustration.

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