General Mechanical

General Mechanical

convergence and failure analysis and Load vs Displacement curve

    • vangapandu goutham
      Subscriber
       Solution not converged at time 0.86 (load step 1 substep 860).          
        Run terminated.    
       
      the above shown is the error ----  I have already used stabilized command
       
      I have a few questions to be cleared up. - This is Static structural non linear analysis
      1) What are the material models to be used for Structural Adhesive and Vinyl-ester glass composite
      2) If the material models are provided accurately, can I match the load vs displacement curve with experimental data? if not what are the other parameters to be looked into
      3)How to plot the load vs displacement curve? I have been selecting the nodes at the fixed position and getting the fsum and displacement by load steps, if this is not how it is done.
      please let me know
       
      THANK YOU for your kindess and for your valuable time answering my questions in Advance
       
      below is the APDL script
      please let me know the changes to be done
       
      /clear
      /prep7
       
      !keypoints
      k,1,0,0,0
      k,2,0,1.72,0
      k,3,0,4.72,0
      k,4,0,16.5,0
      k,5,0,19.5,0
      k,6,0,20,0
      k,7,0,22,0
      k,8,8,22,0
      k,9,8,20,0
      k,10,8,19.5,0
      k,11,8,16.5,0
      k,12,8,4.72,0
      k,13,8,1.72,0
      k,14,8,0,0
      k,15,8.5,22,0
      k,16,8.5,20,0
      k,17,8.5,19.5,0
      k,18,8.5,16.5,0
      k,19,8.5,4.72,0
      k,20,8.5,1.72,0
      k,21,18,22,0
      k,22,18,20,0
      k,23,18,19.5,0
      k,24,18,16.5,0
      k,25,18,4.72,0
      k,26,18,1.72,0
      k,27,25.4,19.5,0
      k,28,25.4,16.5,0
      k,29,25.4,4.72,0
      k,30,25.4,1.72,0
      k,31,100,19.5,0
      k,32,100,16.5,0
      k,33,100,4.72,0
      k,34,100,1.72,0
       
       
      !element type
      allsel
      et,1,183,,,1
       
      a,1,2,13,14
      a,2,3,12,13
      a,3,4,11,12
      a,4,5,10,11
      a,5,6,9,10
      a,6,7,8,9
      a,9,8,15,16
      a,10,9,16,17
      a,11,10,17,18
      a,12,11,18,19
      a,13,12,19,20
      a,20,19,25,26
      a,19,18,24,25
      a,18,17,23,24
      a,17,16,22,23
      a,16,15,21,22
      a,24,23,27,28
      a,25,24,28,29
      a,26,25,29,30
      a,30,29,33,34
      a,29,28,32,33
      a,28,27,31,32
       
       
      !material properties 
      !Stainless steel 303
      mp,ex,1,193000
      mp,prxy,1,0.25
       
      !Hysol EA 9394 Adhesive
      mp,ex,2,4068
      mp,prxy,2,0.37
       
       
       
      !need to add stress and strain values
       
      !E-QXM 3608 glass laminate
      mp,ex,3,18850
      mp,ey,3,18850
      mp,ez,3,18850
      mp,prxy,3,0.3
      mp,pryz,3,0.3     
      mp,prxz,3,0.3
      mp,gxy,3,7230
      mp,gyz,3,7230
      mp,gxz,3,7230
       
      !Vinyl ester balsa core 
      mp,ex,4,2800
      mp,ey,4,83
      mp,ez,4,32
      mp,prxy,4,0.014
      mp,pryz,4,0.011
      mp,prxz,4,0.65
      mp,gxy,4,140
      mp,gyz,4,76
      mp,gxz,4,45
       
      !Vinyl-ester glass composite
      mp,ex,5,3710
      mp,prxy,5,0.28
       
       
      /NERR,9999999999
       
      lsel,s,,,1
      lsel,a,,,3
      lesize,all,,,0.86
       
      lsel,s,,,2
      lsel,a,,,4
      lsel,a,,,6
      lsel,a,,,9
      lsel,a,,,12
      lsel,a,,,15
      lsel,a,,,18
      lesize,all,,,4
       
       
      lsel,s,,,5
      lsel,a,,,7
      lsel,a,,,29
      lsel,a,,,32
      lsel,a,,,47
      lsel,a,,,50
      lsel,a,,,55
      lsel,a,,,43
      lsel,a,,,37
      lsel,a,,,25
      lsel,a,,,13
      lsel,a,,,11
      lesize,all,,,1.5
       
       
       
      lsel,s,,,8
      lsel,a,,,10
      lsel,a,,,27
      lsel,a,,,35
      lsel,a,,,45
      lsel,a,,,53
      lesize,all,,,5.89
       
       
      lsel,s,,,16
      lsel,a,,,23
      lsel,a,,,22
      lsel,a,,,24
      lsel,a,,,39
      lsel,a,,,26
      lsel,a,,,28
      lsel,a,,,30
      lsel,a,,,14
      lsel,a,,,20
      lesize,all,,,0.25
       
       
       
      lsel,s,,,17
      lsel,a,,,19
      lsel,a,,,21
      lsel,a,,,41
      lesize,all,,,1
       
       
       
      lsel,s,,,40
      lsel,a,,,38
      lsel,a,,,36
      lsel,a,,,34
      lsel,a,,,31
      lsel,a,,,33
      lesize,all,,,4.75
       
       
      lsel,s,,,42
      lsel,a,,,44
      lsel,a,,,46
      lsel,a,,,48
      lesize,all,,,3.7
       
       
      lsel,s,,,54
      lsel,a,,,52
      lsel,a,,,49
      lsel,a,,,51
      lesize,all,,,27.3
       
      allsel
      amesh,all,all
       
       
       
      SHPP,ON 
       
      allsel
      asel,s,,,1,6,1
      asel,a,,,7,16,9
      esla
      emodif,all,mat,1
       
       
       
      asel,s,,,8,11,1
      asel,a,,,15
      esla
      emodif,all,mat,2
       
       
      asel,s,,,12,14,2
      asel,a,,,17,19,2
      asel,a,,,20,22,2
      esla
      emodif,all,mat,3
       
       
      asel,s,,,21
      esla
      emodif,all,mat,4
       
       
      asel,s,,,13,18,5
      esla
      emodif,all,mat,5
       
       
      !allsel
      et,2,186
      emodif,all
      type,2
       
      !To clear 2d plane elements and extrude 
      allsel
      extopt,aclear,1
      eextrude,axis,0,,,90,,
       
       
      allsel
      eplot
       
      !load conditioning
       
      allsel
      nsel,r,loc,y,21.9,22
      d,all,uy,9
       
      allsel
      nsel,r,loc,y,1.62,1.72
      csys,5
      nsel,u,loc,x,0,50.8
      d,all,all
      csys
       
       
      !Symmetry
      allsel
      nsel,r,ang,zx,0
      d,all,uz,0
       
      allsel
      nsel,r,ang,zx,-90
      d,all,ux,0
       
      allsel
      eplot
       
      /solu
      STABILIZE,CONSTANT,ENERGY,0.0001,ANYTIME,0.2
      !NLADAPTIVE,all,add,contact,NUMELEM
      antype,static,new
      !CNVTOL,F,1000000,0.001,2,,
      NROPT,AUTO
       
      OUTRES,all,all
      !mxpand,,,,yes,,yes
      NLGEOM,ON
      AUTOTS,AUTO
       
      nsubst,1000,1000,1000
      neqit,100
       
      allsel
      solve
       
    • Erik Kostson
      Ansys Employee

      Hi 
       
      For your questions here is some feedback:
      1) That is something for the user to input (the user needs to find these out and enter the properties)
      2) That is not possible to answer – as for the second part of the question, except of materials, there are the boundary conditions loads, contact conditions between layers, and other assumptions possibly made in the FE model that might or might not reflect reality in an accurate way
      3) FSUM can get the nodal forces on selected nodes

      Hope this helps

      Sure other members of the forum might have some comments also.

      Erik

    • vangapandu goutham
      Subscriber

      thank you for your quick response and for all the answers

      but my main question is that my solution is not converging!

      could you please provide some inputs, so that I can complete my simulation first then I guess, I can input my material models to achieve the objective

       

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