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Reaction forces on a moving rigid plate ANSYS LS-DYNA

    • AhmetKaya

      Hello everyone,

      I am currently working on a crushing analysis in ANSYS LS-Dyna and could use some guidance. My simulation involves a fixed rigid pool containing a flexible body, with the flexible body being compressed by an upper rigid plate. My goal is to compress the flexible body up to a specific point.

      I already have experimental data from a conducted test, which includes a stress vs. time graph. The stress in the experiment was calculated as the reaction forces on the plate divided by the plate's area. Now, I'm looking for a straightforward method to determine the reaction forces on the moving rigid plate within ANSYS LS-Dyna. I have attached my model picure for better understanding, and any suggestions for improving the model are also welcome.

      Any advice or suggestions would be greatly appreciated.

      Thank you in advance!


    • Armin_A


      Hi Ahmet,

      The reaction force in the plate is due to the interactions of the rigid plate with the deformable body. In Workbench LS-DYNA, you can define a body contact tracker and scope it to the rigid plate before running the analysis. Next, you can define a Contact Force tracker (see screenshot below), and then select the proper contact region and orientation. This should provide you with the reaction forces on the moving plate.
       As a side note, under Analysis Settings, make sure your desired frequency at which the histotry data is reported is specified under Time History Output Controls.

      Finally, if you have access to Ansys Learning Hub (ALH), the following course on Ansys Workbench LS-DYNA might be of interest to you: SuccessFactors Learning: Item Details for Ansys Workbench LS-DYNA Getting Started (



      • AhmetKaya


        Thank you so much, Armin_A. Your advice has been incredibly helpful. I did attempt this previously but mistakenly selected the wrong contact parameters, resulting in unrealistic reaction forces. Now, with your guidance, the results appear to be much more reliable.

        I hope you have a wonderful day ahead!

        Best regards, Ahmet K.


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