Learning Forum

[Cyberz]

Hello all!

I'm trying to simulate a 2D frictional contact between a surgical instrument and what would be a human tissue. The current model with the current mesh.

[peteroznewman]

nChange the tool to a rigid body.nAdd small radius blends on the tool corners.nUse smaller elements on the skin, such as 4 nodes around a corner blend of the tool.nUse smaller time steps, initial and minimum substeps set to 1000.nWhich side of the contact is the skin? If you make the tool a rigid body, the tool must be on the Target side.nTry Linear elements.nTry an All Triangle mesh on the skin. n

[Cyberz]

Use smaller time steps, initial and minimum substeps set to 1000 -> Done, no effect.nTry an All Triangle mesh on the skin. -> Done, no effect.nTry Linear elements. -> Worked for a increased displacement (for the values I need it to work). With smaller element size and the increased displacement, failed.nLinear elements with All Triangle -> Done, convergence results got worse.n...the tool must be on the Target side. -> DonenChange the tool to a rigid body. -> Is there a way to do it and maintain the displacement applied to the tool? Or, in this case, the only option is to make the Skin move?n

[Cyberz]

To anyone out there having the same issues, additional steps that helped achieve convergence:nConnections ? Contacts ? Frictional ? Advanced ? Detection Method ? Nodal-Normal to Target (was Program Controlled)nConnections ? Contacts ? Frictional ? Advanced ? Normal Stiffness ? Factor 0.2 (was Program Controlled)nCheers!n