subtracting the deformations 1

[jiligeo]

Dear friends,
How can I subtract the deformations of load case 2 from load case 1? In the other words, how can I set the deformations to zero before starting the load case 2?

Regards
Jili

 

[meshparts]

Hi,

I have done some time ago such a thing. You could save the displacements of the first load case in a table parameter and then use the comand desol to substract the initial deformations (from the table) from the actual deformations. When you then plot the results, you will see only the displacements from the second load case.

Regards,
Alex

 

[jiligeo]

Dear Alex,
thanks a lot for your answer. Do you have any example that uses this command?

Regrads
Jili

 

[meshparts]

For example (just 2 load cases):

/post1
lc=2 ! two load cases
! define vector of nodal displacements:
nsel,all
*get,ncount,node,,count
*dim,uvector,array,ncount,3,lc
! fill uvector with results from all loadcases:
*do,i,1,lc
set,i
*vget,uvector(1,1,i),node,1,u,x
*vget,uvector(1,2,i),node,1,u,y
*vget,uvector(1,3,i),node,1,u,z
*enddo
! substract results (first lc from second lc) and
! overwrite the second lc:
*voper,uvector(1,1,2),uvector(1,1,2),sub,uvector(1,1,1)
set,2
nd=ndnext(0)
*dowhile,nd
dnsol,nd,u,x,uvector(i,1,2)
dnsol,nd,u,y,uvector(i,2,2)
dnsol,nd,u,z,uvector(i,3,2)
nd=ndnext(nd)
*enddo
plnsol,u,sum
*enddo

I don't find the original code, so I'm not shure this code is 100% bug free. I hope it works.

Regards,
Alex

 

[jiligeo]

Dear Alex, Thanks a lot for your valuable answer,

Regards
Jili