Learning Forum

[javat33489]

I'm simulating SPH drilling of sandstone particles using Mohr Coulomb in WB LS-Dyna ACT.

Drill - rigid body.

Nozzles on the drill are deformable.

Steel properties:

Sandstone properties:

Why do my baits bend so much? They are much harder than sandstone. Drilling does not occur:

Calculation time 0.001 s.

I am using Displacement:

Rotate 180 degrees and move 5 mm.

[Ram Gopisetti]

Hi javat, 

rethink the material model for sandstone with some failure criteria , read the paper title "Numerical simulation of impact on pneumatic DTH hammer percussive drilling " by Changgen Bu et.al .

cheers Ram 

[javat33489]

I read, thank you what I need.

BUT I can't add that kind of stuff to Dyna ACT WB.

1. I tried to add a MAT_JOHNSON-HOLMQUIST_CONCRETE snippet and PART card to link the rock to be drilled to the material, but the workbench gives me errors:

Then I decided to add a section map, it didn't help either:

How to add material snippet to Dyna ACT WB?

I have a rigid drill. Rock / blank - sph - I want to assign the material to it through the map:

2. Then I decided to add material to DYNE Prepost. And the calculation did not work again, the following error appears:

But with a simple plastic material he thinks

 

[javat33489]

I figured out the LS Dina ACT.

The material snippet needs to be inserted into the geometry and not into the solver.

BUT the material still does not work. When inserting a snippet:

writes an error:

If you insert without a TITLE, then the calculation does not start.

But the LS-Dine postprocessor (black) still does not work. Error above.