Comand ESTIF to insert in script

- January 13, 2023 at 8:58 am
  
  Riccardo Petrelli
  Subscriber
  
  I'm using this EKILL script to kill the stiffness of elements that reach a certain threshold, but I don't want this to go to 0 but to decrease by 0.7, I saw that the ESTIF command exists, but I don't know where to insert it. Help? this is for a compression test
  
  total_steps=10
  subst_int=10
  subst_max=20
  subst_min=10
  
  *do,i,1,total_steps
  /gopr
  time_step=i/total_steps
  time,time_step
  nsubst,subst_int,subst_max,subst_min
  outres,all,all
  esel,all
  solve
  finish
  /post1
  set,last
  
  ! esel,s,live
  ! *get,live_count%i%,elem,0,count
  ! esel,inve,live
  ! *get,dead_count%i%,elem,0,count
  
  esel,all
  etable,stress,s,eqv
  esel,s,etab,stress,ARG1
  ! *get,stress_ecount%i%,elem,0,count
  cm,kill_stress%i%,elem
  cmsel,s,kill_stress%i%,elem
  ! *get,stress_ecount%i%,elem,0,count
  esel,all
  etable,strain,epto,eqv
  esel,s,etab,strain,ARG2
  ! *get,strain_ecount%i%,elem,0,count
  cm,kill_strain%i%,elem
  cmsel,s,kill_strain%i%,elem
  ! *get,strain_ecount%i%,elem,0,count
  
  allsel
  cmwrite,kill_list,cm
  parsav,all
  finish
  
  /solu
  antype,,restart
  parres
  ! *status
  /input,kill_list,cm
  *do,k,1,i
  ekill,kill_stress%k%
  ekill,kill_strain%k%
  ! *status
  *enddo
  *enddo
  
  finish
- January 13, 2023 at 9:38 am
  
  Erik Kostson
  Ansys Employee
  
  Hi
  
  It can come in the /solu, just before the ekill command.
  Hope this helps
  Erik
  - January 13, 2023 at 9:41 am
    
    Riccardo Petrelli
    Subscriber
    
    Is this correct:
    estif, 0.8
    /solu
    antype,,restart
    parres
    ! *status
    /input,kill_list,cm
    *do,k,1,i
    ekill,kill_stress%k%
    ekill,kill_strain%k%
    ! *status
    *enddo
    *enddo
    
    finish
- January 13, 2023 at 9:43 am
  
  Riccardo Petrelli
  Subscriber
- January 13, 2023 at 9:43 am
  
  Erik Kostson
  Ansys Employee
  
  No thats is not correct we said in the /solu (it is outside) and before the ekill so:
  /solu
  ...
  ...
  *do,k,1,i
  estif,..
  ....
  - January 13, 2023 at 9:45 am
    
    Riccardo Petrelli
    Subscriber
    
    Thank you very much, i love you
  - January 13, 2023 at 1:51 pm
    
    Riccardo Petrelli
    Subscriber
    
    why this error?
  - January 17, 2023 at 6:31 pm
    
    Riccardo Petrelli
    Subscriber
    
    don't work it
- January 13, 2023 at 1:56 pm
  
  Erik Kostson
  Ansys Employee
  
  See the help manual (command ref.) – this command needs an Enterprise licence.
  All the best
  Erik
  - January 13, 2023 at 2:59 pm
    
    Riccardo Petrelli
    Subscriber
    
    I have the last question to ask you, thank you for all the answers, tsai saving my life. if I want to reduce the stiffness by 50%, is it right to enter ESTIF, 0.5? Thanks again
- January 13, 2023 at 3:10 pm
  
  Erik Kostson
  Ansys Employee
  
  Never used it, but since it is a multiplier it multiplies the element stiffness matrix with 0.5 so you get half of the element stiffness I suppose when you put 0.5 in the command.