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Hi, I am enforcing an elongation to a simple cube using a RBE2 on one of its sides.The model works with an enforced displacement (SPC and SPCD on the master node of the RBE2) equal to 3 (DOF1=3 for both SPC and SPCD), but whenever I reduce the displacement to 1, the RBE2 loses its rigidity and deflects in a strange way.The two conditions are completely identical for what regards the rest of the model.Does anybody have some hint which explains this behavior of the model?Thank you.The two models and a .png preview of the results are attached.
The issue is you have dof1=1 in the SPC and dof1=1 in the SPCD, which means these imposed displacements are superposed. There are two solutions:
-set the dof1=0 in the SPC
-remove the tload from loadstep, since dof1=1 in the SPC will do the same thing as dof1=1 in the SPCD (redundant).
Note that in the nonlinear static, loads or displacements are ramped up linearly by default. Only use TLOAD if the loading function is nonlinear.
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Hi,
make sure to also constrain the master node of the RBE2 in all degrees of freedom to prevent unwanted deflections.
Thank you very much for your help!
May I also ask why, imposing a displacement equal to 1 (DOF1=1 of SPC and SPCD), I obtain a displacement of 2 in the results?Thank you again.
Thank you for the clear explanation. Yuri
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