Soil-Tool interaction

[Poita]

Ripper.inp

Hi all,

I am trying to get my head around Granoo but get a bit stuck on the topic of bonds between elements. I am looking to simulate interaction between soil particles and a tool. The attached .inp file works in so far that the tool interacts with the particles, but the particles fly off in all directions. I have made up the domain with the cooker utility. It looks like the particles are paired, but the bond definition is either lacking or not correctly defined ?

The Granoo documentation is a bit sparse, if someone could point me in the right direction then that would be greatly appreciated !

Cheers, Peter

[Damien André]

Hello, sorry for the late reply.

Yes, you need to affect mechanical bond to "element pair". If you want beams, you can  use the   "CONVERT-ELEMENT-PAIR-TO-BEAM" Plugin. You can take a look into the 00010 example.

Cheers, Damien.

[Poita]

Hi Damien,

Thank you for your reply. I am still learning and I thought it better to set up an Angle of Repose test to see how various parameters affect the simulation. To that end I have made up the attached .inp file, in which the particles made with cooker settle under gravity and then the support shape cylinder is deleted, so the particles can form a cone.

However, the "CONVERT-ELEMENT-PAIR-TO-BEAM" Plugin only makes 26 bonds and there are well over 3000 element pairs untouched. The documentation says the plugin should convert all element pairs ? With only 26 bonds the particles probably will not "clump" together like soil particles would ?

Cheers, PeterAngle_of_Repose_Bonds.inpCookingBook.inp

[Damien André]

Hum, probably, the beams reach directlty their ultimate bond strength. Please try :
<CONVERT-ELEMENT-PAIR-TO-BEAM MacroYoungModulus="5e4" MacroPoissonRatio="0.3"/>

PS :
When a beam is broken, it is directly converted to a "Core::Pair<DEM::Element>"

Cheers, Damien