A new coupled fluid–structure modeling methodology for running ductile fracture

Nordhagen, Håkon Ottar; Kragset, Steinar; Berstad, T.; Morin, Alexandre; Dørum, Cato; Munkejord, Svend Tollak

doi:10.1016/j.compstruc.2012.01.004

Cited by 45 publications

(29 citation statements)

References 33 publications

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“…This approximation is likely to overestimate the force on the opening flanks. Nevertheless, good agreement with both the experimentally obainted final crack-propagation lengths and pressure time histories at the crack position (12 o'clock) was obtained in [10]. Additionally, the coupled model simulates a pipeline on flat ground, while the uncoupled models are fitted to experiments with pipelines in a ditch.…”

Section: Resultsmentioning

confidence: 67%

“…With an explicit time-integration scheme, the deformation and fracture of the pipe has been calculated using shell elements and an elasto-plastic constitutive equation [10] with a local ductile fracture criterion [17]. Although pipeline materials often show a certain degree of plastic anisotropy and strain-rate sensitivity, we have for simplicity assumed an isotropic yield criterion (von Mises), with a strain-rate independent nonlinear isotropic work-hardening rule.…”

Section: Structure Modelmentioning

confidence: 99%

“…In [9,10], we presented a fully coupled fluid-structure model for the assessment of running-ductile fracture. Herein, the fluid flow was modelled as one-dimensional inside the pipe and through the crack opening.…”

Section: Introductionmentioning

confidence: 99%

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CO2 Pipeline Integrity: Comparison of a Coupled Fluid-structure Model and Uncoupled Two-curve Methods

et al. 2014

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One challenge in CCS is related to the prevention of running-ductile fracture in CO 2 -carrying pipelines. Commonly used tools for ensuring crack arrest in pipelines hinge mainly on semi-empirical models, which may not be appropriate for CO 2 transport since they have been developed and fitted for natural gas and older pipeline materials, and due to an assumed decoupling of the fluid decompression and fracture propagation phenomena. In this paper, we apply a coupled fluid-structure model to a case with pure dense liquid CO 2 in a modern high-toughness steel pipeline, and compare the results one would obtain from directly applying the uncoupled models to the same case without any re-fitting to test data. For this case, the coupled model indicates that a significantly thicker pipeline wall may be required to prevent running-ductile fracture than what is predicted by the uncoupled models. Therefore, using the uncoupled models for such cases might not be conservative.

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Section: Resultsmentioning

confidence: 67%

Section: Structure Modelmentioning

confidence: 99%

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CO2 Pipeline Integrity: Comparison of a Coupled Fluid-structure Model and Uncoupled Two-curve Methods

et al. 2014

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“…[6][7][8][9][10][11] Plastic and viscoplastic effects of the structure are also included in the modeling. [6][7][8][9][10][11] Plastic and viscoplastic effects of the structure are also included in the modeling.…”

Section: Overview Of Related Researchmentioning

confidence: 99%

“…Rupture of thin-walled tubes subjected to detonation waves traveling through the fluid contained in the pipe is the most widely simulated example. [6][7][8][9][10][11] Plastic and viscoplastic effects of the structure are also included in the modeling. This tube-rupture problem represents a motivation to study the accidents occurring in the cooling system of nuclear power plants and in underwater implosions.…”

Section: Overview Of Related Researchmentioning

confidence: 99%

A strongly coupled partitioned approach for fluid‐structure‐fracture interaction

Sudhakar

Wall

2018

Numerical Methods in Fluids

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Summary We present a novel method to model large deformation fluid‐structure‐fracture interaction, which is characterized by the fact that the fluid‐induced loads lead to fracture of the structure and the fluid medium fills the resulting crack opening; the mutual interaction between the crack faces and the surrounding fluid contributes substantially to the overall dynamics. A mesh refitting approach is used to model the quasi‐static fracture of the structure, and a robust embedded interface formulation is used to solve the fluid flow equations. The proposed method uses a strongly coupled partitioned scheme with Aitken's Δ2 method as convergence accelerator. Selected numerical examples of increasing complexity are presented to evaluate the performance of the proposed fluid‐structure‐fracture coupling algorithm. The most difficult simulation of the reported examples involves a number of complex phenomena: mixed‐mode crack propagation through the structure, fluid starts to fill the crack opening, complete fracture of the structure into two pieces of which one is carried away by the flow.

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Anisotropic Behaviors for X100 High Grade Pipeline Steel Under Stress Constraints

Yang

Sha

Yang

et al. 2017

The Minerals, Metals &Amp; Materials Series

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A new coupled fluid–structure modeling methodology for running ductile fracture

Cited by 45 publications

References 33 publications

CO2 Pipeline Integrity: Comparison of a Coupled Fluid-structure Model and Uncoupled Two-curve Methods

CO2 Pipeline Integrity: Comparison of a Coupled Fluid-structure Model and Uncoupled Two-curve Methods

A strongly coupled partitioned approach for fluid‐structure‐fracture interaction

Anisotropic Behaviors for X100 High Grade Pipeline Steel Under Stress Constraints

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