General Mechanical

General Mechanical

SOLID65 cracking and crushing

    • Oliver Thomsen
      Subscriber

      Hi Ansys Forum :)

      I would like to begin a discussion with a problem Im currently having.

      Not a proffessional in ANSYS WorkBench, so I have based the major commands on discussion in here and from Youtube. I therefore guess this also could be relevant for others in similar position. 

      Im modelling a reinforced concrete wall and subjecting it to shear and normal force.

      The BC's are based on a wall that in principle can overturn but I regulate the applied loads to not activite this failure mechanism.

      The failure mechanism I want to model is the crushing of the corner and tension at the opposite edge. 

      However...

      I get the wall to deform so that it places all its selfweight on the corner, however no crushing or cracking behavior occur (which from my jugdement should happen). I therefore think that something is wrong with the definition of the material for the SOLID65 (which is based on commands 'stolen' from others.

      Is there someone that have had similar problems and then fixed it?

      I will just provide some details here:

      Concrete C25, Willam Warnke material

      ET,MATID,SOLID65
      R,MATID,0,0,0,0,0,0
      RMORE,0,0,0,0,0

      MP,EX,MATID,30575.8555 
      MP,PRXY,MATID,0.2
      MPTEMP,MATID,0

      TB,DENS,1
      TBDATA,1,2300

      TB,CONCR,MATID,1,9
      TBTEMP,22
      TBDATA,1,0.3,1,1.8,25

      TB,MISO,MATID,1,9,0 
      TBTEMP,22
      TBPT,,0.000120689655172414,3.69016655770889
      TBPT,,0.000241379310344828,6.94085738924437
      TBPT,,0.000362068965517241,9.80145314995161
      TBPT,,0.000482758620689655,12.3142035252780
      TBPT,,0.000603448275862069,14.5154695918616
      TBPT,,0.000724137931034483,16.4367151903659
      TBPT,,0.000844827586206897,18.1053045400244
      TBPT,,0.000965517241379310,19.5451488816296
      TBPT,,0.00108620689655172,20.7772344677635
      TBPT,,0.00120689655172414,21.8200565467812
      TBPT,,0.00132758620689655,22.6899783047455
      TBPT,,0.00144827586206897,23.4015294797432
      TBPT,,0.00156896551724138,23.9676561554440
      TBPT,,0.00168965517241379,24.3999307989400
      TBPT,,0.00181034482758621,24.7087297339610
      TBPT,,0.00193103448275862,24.9033837914440
      TBPT,,0.00205172413793103,24.9923067507723
      TBPT,,0.00210000000000000,25
      TBPT,,0.00229310344827586,25 !24.8826735443435
      TBPT,,0.00241379310344828,25 !24.6972745393916
      TBPT,,0.00253448275862069,25 !24.4326108788668
      TBPT,,0.00265517241379310,25 !24.0938860155883
      TBPT,,0.00277586206896552,25 !23.6858577034653
      TBPT,,0.00289655172413793,25 !23.2128847171809
      TBPT,,0.00301724137931035,25 !22.6789678157705
      TBPT,,0.00313793103448276,25 !22.0877857608253
      TBPT,,0.00325862068965517,25 !21.4427270721254
      TBPT,,0.00337931034482759,25 !20.7469180978461
      TBPT,,0.00350000000000000,25 !20.0032478888722

      Reinforcement

      ET,MATID,LINK180 
      MPDATA,EX,MATID,,2.1e5

      MPDATA,PRXY,MATID,,0.3 
      TB,BISO,MATID,1,2 
      TBDATA,,500,1000
      R,MATID,4,,0 

      Interaction

      /PREP7

      ESEL,S,ENAME,,65
      ESEL,A,ENAME,,180
      ALLSEL,BELOW,ELEM
      CEINTF,0.001,
      ALLSEL,ALL
      /SOLU
      OUTRES,ALL,ALL

      Cracking/Crushing plots

      /SHOW,png

      /ANG,1,

      /VIEW,1,0,0,0  

      SET,1,1

      /DEVICE,VECTOR,ON


      /POST1

      SET,1,, ,,, ,last


      PLCRACK,0,0


      /POST1


      SET,2,, ,,, ,last


      PLCRACK,0,0

      Boundary conditions

      Compression only at y=0
      Dis x=0 at y=0

      Loads

      at y = top

      at y = top

       

      Have good day!

    • peteroznewman
      Subscriber

      Hi Oliver,

      I am not an expert on cracking/crushing simulation using SOLID65, but I noticed that your solid mesh has only 3 elements through the thickness of the wall.

      I suggest you try putting 12 elememt through the thickness and see if that helps.  If you simply make the element size 1/4 of the current size, the number of elements will go up by a factor of 64. If you are using the Student license, that may put the mesh over the limit on the number of nodes or elements of 128,000.  If that is the case, you can sweep 12 elements through the thickness, without changing the default element size.

      That will make the element thin in one direction if you don’t change the height. You should also make the bottom layer of elements have the same height as thickness. In Mechanical, you would apply a Mesh Size control on the vertical edges of the wall and use a Bias factor of 4. I'm not sure how you do that in the APDL environment.

    • Oliver Thomsen
      Subscriber

      Hi Peter

      Yes, maybe the problem lies within the definition of the mesh.

      Im currently limited by the student license, but I will try to incorporate your ideas.

      Thank you, I appreciate the guidance and quick response!

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