General Mechanical

General Mechanical

Force don’t converge

    • Riccardo Petrelli
      Subscriber

      hello, I'm using an ekill script that kills the elements that exceed a certain strain and stress threshold in particular 0.035 and 1900 Mpa in a compression test for lattice structures in Ti6Al4-V, I want to reproduce the decreasing part of the obtained stress strain curve in the laboratory. Below I am attaching the graph of the force and you can see the decreasing curves, which are due to the killing of the elements. Can anyone tell me how to increase the stiffness of the killed elements? because by default it is set to 0, I would like to reduce it perhaps by half. Thank you. I am attaching my script for Ekill

       

      SCRIPT EKILL :

      total_steps=20
      subst_int=3
      subst_max=50
      subst_min=3
      neqit, 1500!numero massimo di iterazioni di default è impostato su 15
       
      *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
       
       This is the mesh:
    • Erik Kostson
      Ansys Employee

      Hi

       

      Perhaps seacrh the internet for convergence and ansys, e.g.,:

       

      Hope this helps

       

      Erik

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