Sliding Contact for two solids 2

[SaeidII]

Hello, I have two solids with different Poisson ratio pushed against each other. Model is analyzed by ls-dyna and I have huge shear stresses on the surfaces of the solids. Contact friction is set to zero; Any idea if this is supposed to be like this?
I'd appreciate for your comments.

 

[sampurna]

in ansys i think u give no separation as a contact type ......

dont know how to do it in ls dyna

 

[SaeidII]

Hello Sampurna, for Explicit Analysis there must be no difference, since ansys uses ls-dyna code for explicit analysis. Can you please tell more?

 

[missil3]

Can you post the contact card you are using in lsdyna ? Are you use the sliding contacts ?

 

[GregLocock]

How about rerunning it with the same Poissons for each surface?

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[SaeidII]

Hello,
Missil, I am using solid to solid contact. I tried soft method and pinball and the results are similar.
Greg, Because the solids are cylinders with different diameters; if they don't slide freely when having radial deformation there will still be forces in the contact plane.
I checked the nodal forces for nodes of one of the cylinders and I notice out of 1700 nodes almost all of them only have x forces (axis x perpendicular to contact palne so all forces should be in x direction) but some node also have x and y forces. It's like they get stuck to the surface of the other solid and can't move or something like that. I tried the analysis with and without initial penetration elimination, no difference though.