SYMPOSIA PAPER Published: 01 January 2003
STP11076S

Cell Model Predictions of Ductile Fracture in Damaged Pipelines

Source

This study explores further extension of the computational cell methodology to model Mode I crack extension in a high strength pipeline steel. Plane-strain analyses of a tubular structure containing longitudinal cracks with varying crack depth to thickness ratios (a/t) are employed to characterize crack-tip constraint for cracked pipes under internal pressure. Laboratory testing of an API 5L X70 steel at room temperature using standard, deep crack C(T) specimens provides the crack growth resistance curve to calibrate the micromechanics cell parameters for the material. The cell model incorporating the calibrated material-specific parameters is then applied to predict the burst pressure of a thin-walled gas pipeline containing longitudinal cracks with varying crack depth to thickness ratios (a/t). The numerical analyses demonstrate the capability of the computational cell approach to simulate ductile crack growth in fracture specimens and to predict the burst pressure of thin-walled tubular structures containing crack-like defects.

Author Information

Ruggieri, C
University of São Paulo, São Paulo, Brazil
Hippert, E
University of São Paulo, São Paulo, Brazil
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Details
Developed by Committee: E08
Pages: 176–191
DOI: 10.1520/STP11076S
ISBN-EB: 978-0-8031-5472-8
ISBN-13: 978-0-8031-2899-6