Homogenization of Stresses

[jun]

Dear all,

I am trying to include resiudal stresses to a half-circle in 3D. To accomplish that I start from an opening angle and use the spin command to "close" the ring (I use half the ring and symmetry bcs).

After I have closed the ring I try to release the BCs and let the solution homogenize. Unfortunately this does not happen - the stresses are still uneven ( I am looking at circumferential stresses).

Can anybody suggest what I am doing wrong ( i attached the input file)? Thanks a lot in advance and best wishes!

[Prof. R.L. Taylor]

Did you zero the boundary conditions you originally set? 

You can use the MESH command

     RESEt BOUN

to zero all the b.c.; RESEt also exists for DISP and FORC.

Then define the new values.

Probably both sets of boundary conditions are being used.

[Prof. R.L. Taylor]

For LOAD groups you may have to set the associated PROP load to zero to delete the set values.

[jun]

Dear Professor Taylor,

thank you very much for your quick reply.
I have tried that, also setting all nodal boundaries by hand to zero. I attached a slightly modified input file. I also checked whether the boundaries are reset to zero and then set to the new values again and it did work.
However, the stresses did not homogenize. I am using feap 8.4 btw.

Is there anything else I  could be doing wrong?

Thank you in advance!

[Prof. R.L. Taylor]

Currently, feap does not reset the load group, so probably that is the difficulty.

Is it possible to run the problem without the LOAD group?

Otherwise you may need wrote a user function that kills the load group data.