Abstract
Pipelines in Nuclear Power Plants (NPPs) work under high pressure and temperature which may cause a guillotine rupture on the highly pressurized pipe during a sudden fracture due to a failure of any working component. Owing to the serious safety concerns resulting from such failures, it becomes important to understand the behaviour of these pipe structures under dynamic loading, particularly, the pipe whipping effect. Therefore, this research study deals with understanding the structural response of pipe whip with a computationally efficient Finite Element (FE) model.The complete three-dimensional (3D) FE model is modified and coupled with a one-dimensional (1D) FE model (coupled 1D/3D FE model) and solved under the exact transient conditions, and compared with the complete 3D FE model. The computational time of the complete 3D approach was reduced to about 10 times using the coupled 1D/3D model without compromising on the accuracy of the numerical results. Furthermore, the numerical results were found to be in close agreement with the referenced experimental data. This research provides justifiable results from the FE models where the dynamic behaviour of high-pressure pipes under transient conditions can be simulated by using the proposed coupled 1D/3D modelling approach.
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