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prescribed_motion_rigid problem

- February 20, 2026 at 9:57 pm
  
  zahra.abd994
  Subscriber
  
  Hello there,
  I have a model in which an indenter penetrates a cubic material. The indenter is a rigid body and the cube is SPH node. I also used a node_to_surface contact. For the penetration, I want the indenter to move downward for 5mm. So, I used the PRESCRIBED_MORION_RIGID and also defined a curve (for displacement, so x axis is time) as follows:
  (0,0)
  (1.1,-5)
  The termination time is 1. The problem is that the indenter stuck in 2.5mm and does not move downward to 5mm which I applied. I have tried several contact parameters but no changes happened (still get stuck in 2.5). After that I tried the following displacement curve and time:
  (0,0)
  (1,-5)
  (2.1,-5)
  The termination time is 2. The output of this simulation was different and the indenter moved downward more that 2.5; however, it is now goes to 10mm. Which is more that the prescribed displacement in curve.
  I would be very grateful if someone can help in this regard. Am I applying the displacement in a wrong way? Is the curve wrong? Do I understand the prescribed_motion_rigid keyword wrongly?
  I do appreciate any feedback and advice.

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