Plate with 2 holes (boundary condition question)

[elsimeon]

Hello,

I need to analyse a plate with two holes in tension (pressure q0 on both sides, left and right). The holes are positioned so there is not symmetry in the plate.

As this cannot be directly imposed on ANSYS because it introduces free body motion need to specify other boundary conditions.

I tried to impose UX and UY = 0 at the left plate boundary and in order to confirm if this was correct I analysed the plate with central hole case using the symmetry BC's and using the whole model (I used the data from this tutorial:

https://confluence.cornell.edu/disp...c+plate+with+a+hole+-+Problem+Specification).

Could someone tell me if this is correct or if I should apply a different boundary condition?

Thanks

PS - this is a repost. I'm new to this website and I only found this forum after I posted the same thread on a different forum. I apologize for that

 

[elsimeon]

I forgot to say that the results for the 2 cases (full model vs quarter model) were not very close.

 

[EngAddict]

Quarter model will be wrong if there is no symmetry, run the full plate instead. You are correct in your approach, the reaction at the BC will be equal and opposite to your applied load.

 

[rb1957]

have you considered rigid body motion ? if you're applying load-reaction set of loads, then it should be sufficient to constrain a single node in 6 dof, or three nodes using the 3-2-1 dof constraint.