Learning Forum

[javat33489]

Hi all. I decided to write this post in a new thread. I am cutting geomechanical rock at LS-Dyna AST. When the cutter travels a short distance, the calculation freezes. And this happens because part of the rock breaks and flies away, and small particles scatter over a long distance:

I tried to limit the emitted particles using the BOX function. But it doesn't work:

Should the particles fly apart like this? Where is the mistake?

I tried moving the cutter lower, closer to the middle of the rock. Then the cutting condition is better there. The cutter goes further, but only until a part of the rock is torn off:

 

 

What can be done so that the particles do not scatter and the calculation ends normally?

Thanks.

[Chris Quan]

You need to examine the material model of rock in your model. The rock material needs to take account of the initiation of damage and the progression of damage.