Learning Forum

[hndoli002]

I'm simulating the axial crushing of a tube in ANSYS LS-DYNA Mechanical (2025 R2 Teaching license). While the analysis is working very well, I can't get reaction forces on either side of the tube.

The setup I'm using consists of a plate as an "anvil", the axial tube, and a block as a "hammer", which has velocity and gravitational conditions applied. To calculate the energy absorbed by the deformation, I need to integrate the force over the deformation of the tube. I can easily get data for how much the tube has deformed from the displacement of the 'hammer', but I'm having difficulty getting the force of the hammer on the tube. I would usually measure this between the tube and 'anvil' plate. If I explore Results →Worksheet, it appears that forces are not a user-defined result that I can directly get.

Is there a way of getting reaction forces on the supports on the plate, or of getting the contact force between the tube and plate directly? At the moment I'm getting the average pressure across the surface to calculate the force, but this is not seeming quite accurate - or should it be?

[Nanda]

Hello User,

Please refer to this forum thread: Force reaction in LS-Dyna workbench

Let us know if you need more help.

Regards,

Nanda.

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[hndoli002]

Hi Nanda,

Thanks, that worked perfectly! It also helped with my problem of the time stepping of the results, so that has been sorted out.

Kind regards,

Oli