I would like to ask which of you has done research on buckling restraint of submarine pipelines？
I would like to ask which one of you has done research on buckling control of submarine pipelines, for example, using sleepers to control buckling. I have built a model, but it cannot reach the experimental buckling amplitude, which is puzzling to me.
The pipe is 6 meters long and rests on sleepers
Best Answers

HuiLiu Ansys Employee Posts: 89
How does the result look like, buckling mode, critical load etc? Also what's the BC and loading definition? The "sleeper" seems to be extremely narrow, so how is the mesh on these pieces?

HuiLiu Ansys Employee Posts: 89
To clarify, you are doing a nonlinear static analysis, not eigenvalue buckling, right? From the graph you shared, looks like both buckling load and post buckling behavior are not the same as your test result. In general if you need to compare FEA results with experimental data, make sure the setup in FEA model realistically reflect the physical test. For example, material properties, boundary conditions (say if you have some fixed support, is it rigidly fixed in your experiments as well?), etc.
Numerically, you might want to check to see if you have stabilization energy activated, and if it is too high. The regular NewtonRaphson method will need stabilization to be able to converge a solution upon buckling and post buckling.
Answers
How does the result look like, buckling mode, critical load etc? Also what's the BC and loading definition? The "sleeper" seems to be extremely narrow, so how is the mesh on these pieces?
First of all, thank you for answering my questions, thank you for your patience, and I will introduce some of my models.The following figure is the model data of the experiment
The following is my ansys model diagram，There is a sleeper with a height of 2mm in the middle, and the seabed plane is a rigid plane. Units 170 and 177 are used when the pipeline contacts the seabed, and units 170 and 176 are used when the submarine pipe contacts the sleeper. The initial bending degree caused by the sleeper in the middle of the pipeline is simulated by a formula.
The following is my comparison chart
I don't understand why the uplift degree of my model pipe is lower than the experimental value. I am puzzled, but there is nothing I can do.
First of all, thank you for answering my questions, thank you for your patience, and I will introduce some of my models.The following figure is the model data of the experiment
The following is my ansys model diagram，There is a sleeper with a height of 2mm in the middle, and the seabed plane is a rigid plane. Units 170 and 177 are used when the pipeline contacts the seabed, and units 170 and 176 are used when the submarine pipe contacts the sleeper. The initial bending degree caused by the sleeper in the middle of the pipeline is simulated by a formula.
The following is my comparison chart
I don't understand why the uplift degree of my model pipe is lower than the experimental value. I am puzzled, but there is nothing I can do.
To clarify, you are doing a nonlinear static analysis, not eigenvalue buckling, right? From the graph you shared, looks like both buckling load and post buckling behavior are not the same as your test result. In general if you need to compare FEA results with experimental data, make sure the setup in FEA model realistically reflect the physical test. For example, material properties, boundary conditions (say if you have some fixed support, is it rigidly fixed in your experiments as well?), etc.
Numerically, you might want to check to see if you have stabilization energy activated, and if it is too high. The regular NewtonRaphson method will need stabilization to be able to converge a solution upon buckling and post buckling.
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