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HyperCrash - Initial velocity

Altair Forum User

Hello everyone!

I would like to ask your help to create an initial rotational velocity with a defined rotational axis out of the part. My problem is when all the nodes are selected of the part that I would like rotate, it seems like that the nodes want to rotate around their own axis. This way only a vibration develops.

Thank you in advance.

Sanyo

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Altair Forum User

Hi sanyo,

How are you applying the initial velocity?

can you share the model and output files?

Altair Forum User

In HyperCrash I choose Loadcases - Initial velocity, there the transition is changed to rotational YY, the rotational speed is set, then I create a skew to rotate around. I need to choose all the nodes of the part, because otherwise a stress and vibration is developing in the first moment.

The other method I tried was to create a rigid-body with a fixed mater node connecting to all the nodes of the part, but this is not so helpful, because in this case it is not possible to connect more rigid bodies to the nodes, and the nodes are fixed together, so no stresses and deformations are developing.

I am not at the files now, I will send them later.

Thanks a lot!