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LS Dyna

LS Dyna

Topics related to LS-DYNA, Autodyn, Explicit STR and more.

Constrained rigid body still affected by gravity – WB LS-Dyna

    • LeslieQuiroz
      Subscriber

      Hello everyone,

      I´m trying to simulate a impact. As you can see in the pictures the 6 bodies in the bottom are setted as constrained rigid bodies fixed at the 6 DOF but all the body still moves due to gravity including the constrained cubes. The connection between them and the "legs" is bonded. The legs and plate are rigid too but not constrained. The ball is flexible.

      Questions:

      Is there any tool to join the bodies to the ground like in mechanical ?

      Which tool could I use if I do not want to constrain all the body just the inferior part?

      Should I use another type of connection apart from bonded between the legs and the coinstrained cubes?

      About kinetic energy, constrained rigid bodies are afected by impact energy, in this case, of the ball?

      Thanks in advance¡¡?


    • Ram Gopisetti
      Ansys Employee
      Hi @LeslieQuiroz, having the rigid body constraints to those blocks will make the structure fixed in space with applied gravity, Do check your input again , the following is the result i got based on your definition.
      Cheers, Ram

    • LeslieQuiroz
      Subscriber

      Thank you for your answer. I checked the setup again but I can┬┤t find where is the error. I upload some pictures of the setup.

      It shows that the structure is moving and I do not why¡¡ As you said, it must be fixed in space. Any idea what should I do ? Leslie

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