A fracture-propagation-control model for pipelines transportingCO2-rich mixtures including a new method for material-model calibration
| Autor: | Marion Fourmeau, Håkon Ottar Nordhagen, Gaute Gruben, Stephane Dumoulin, Svend Tollak Munkejord, Morten Hammer |
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| Rok vydání: | 2017 |
| Předmět: |
Work (thermodynamics)
Equation of state Materials science business.industry 02 engineering and technology Structural engineering Plasticity Computational fluid dynamics Finite element method Stress (mechanics) 020303 mechanical engineering & transports 020401 chemical engineering 0203 mechanical engineering Fluid dynamics Fracture (geology) 0204 chemical engineering business Civil and Structural Engineering |
| Zdroj: | Engineering Structures. 143:245-260 |
| ISSN: | 0141-0296 |
| Popis: | This work considers a predictive numerical modelling approach for fracture-propagation control in CO 2 -transport pipelines, an area where current engineering tools do not work. Fluid–structure interaction model simulations are compared with three published medium-scale crack-arrest experiments with CO 2 -rich mixtures. The fluid flow is calculated by a one-dimensional homogeneous equilibrium model, and the thermodynamic properties of CO 2 are modelled using the Span–Wagner and the Peng–Robinson equation of state. The pipe material is represented by a finite-element model taking into account large deformations and fracture propagation. Material data commonly found in the literature for steel pipes in crack-arrest experiments is not sufficient to directly calibrate the material model used here. A novel three-step calibration procedure is proposed to fill the information gap in the material data. The resulting material model is based on J 2 plasticity and a phenomenological ductile fracture criterion. It is shown that the numerical model provides good predictions of the pressure along the pipe, the ductile fracture speed and a conservative estimate of the final crack length. An approximately plane-strain stress state ahead of crack tip implies that a fracture criterion accounting for a wide range of stress states is not necessary. |
| Databáze: | OpenAIRE |
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