Strain capacity assessment of API X65 steel using damage mechanics
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http://orcid.org/0000-0001-2345-6789
Nicola Bonora
University of Cassino and Southern Lazio, Italy
Domenico Gentile
University of Cassino and Southern Lazio, Italy
Andrew Ruggiero
University of Cassino and Southern Lazio, Italy
Gianluca Iannitti
University of Cassino and Southern Lazio, Italy
Antonio Carlucci
SAIPEM SA, Italy
Yazid Madi
EPF-Ecole d'ingénieurs / MINES ParisTech, France
Abstract
Strain-based design for offshore pipeline requires a considerable experimental work aimed to determine the material fracture toughness and the effective strain capacity of pipe and welds. Continuum damage mechanics can be used to limit the experimental effort and to perform most of the assessment analysis and evaluation in a simulation environment. In this work, the possibility to predict accurately fracture resistance of X65 steel using a CDM model proposed by the authors, is shown. The procedure for material and damage model parameters identification is presented. Damage model predictive capability was demonstrated predicting ductile crack growth in SENB and SENT fracture specimens.
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