Pressure transfer mismatch from concrete to metal cylinder

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Wong Ming Hao

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Mar 11, 2026, 9:53:34 PM (7 days ago) Mar 11

to LS-DYNA2

Dear All,

I am modelling a metal cylinder embedded inside a concrete block, with a hollow core at the centre of the cylinder. The metal cylinder is represented using shell elements, while the concrete block is modelled using solid elements. The interaction between the cylinder and the concrete is defined using the Shell-In-Solid formulation.

Currently, I am trying to determine the pressure transferred from the concrete to the cylinder at Point A. However, I observed a significant discrepancy in the pressure values between the concrete solid and metal shell. May I know what's the correct way of doing this?

Screenshot 2026-03-12 094157.png

Thanks,
Ming Hao

l...@schwer.net

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Mar 12, 2026, 9:24:43 AM (7 days ago) Mar 12

to Wong Ming Hao, LS-DYNA2

1\ I do not think you are using *CONSTRAINED_SHELL_IN_SOLID appropriately. I believe this keyword assumes there will be solid (concrete) on both sides of the shell, i.e. embedded shell in solid.

2\ Even if *CONSTRAINED_SHELL_IN_SOLID works with solid on one side, I am not sure how to have LS-PrePost extract the penalty force that would be due to the interface pressure.

3\ Consider using a segment-to-segment contact and extracting the interface forces via the RCFORC option of the *DATABASE keyword.

--len

Thanks,
Ming Hao

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