ADPL comman snippet to replace SOLID186 element with CPT216 Element

- July 27, 2023 at 11:25 am
  
  Fraser Shields
  Subscriber
  
  Hi,
  I'm trying to setup a biphasic analysis of a solid hydrogel reinforced with thermoplastic shell (sandwiched between the solid parts). I have run the initial solution with SOLID186 elements for the hydrogel and shell 281 elements for the shell. I want to use ADPL command snippets within the static structural tab in ANSYS mechanical. However, I am a bit stuck. I am trying to get model the fluid pressure in the hydrogel parts when the construct is placed under a compressive displacement of 20% strain.
  
  I have tried the following command snippet with no success:
  
  /PREP7
  
  ET,9991,CPT216
  
  ESEL, S, SOLID186
  
  EMODIF, ALL, TYPE, 9991
  
  /SOLU
  
  Any help would be much appreciated,
  
  Thanks
- July 28, 2023 at 10:51 am
  
  Rahul Kumbhar
  Ansys Employee
  
  Hi,
  It seems ESEL command is wrong. It should be like: ESEL,S,ENAME, ,186
- July 28, 2023 at 3:01 pm
  
  Dave Looman
  Ansys Employee
  
  Also, add ALLSEL command after EMODIF.
- July 31, 2023 at 5:36 pm
  
  Fraser Shields
  Subscriber
  
  Thanks for the help, I've managed to improve my script slightly, however I am now running into an error "Element type 216 requires the definition of TB,PM with the activation of pressure DOF (KEYOPT(12)). ". My script is as follows:
  /PREP7
  
  ! Define an element type with the desired real constant (CPT216)
  ET, 9991, CPT216
  
  ! Select the solid elements you want to modify (SOLID186)
  ESEL, S, TYPE,, 13, 57
  ! Modify the selected elements to use the specified element type (9991)
  EMODIF, ALL, TYPE, 9991
  
  ! Define proelastic material for solid elements
  MP,EX,1,0.001 ! YOUNG'S MODULUS
  MP,NUXY,1,0.0 ! POISSON'S RATIO
  FPX=0.5 ! PERMEABILITY
  ONE=1.0
  TB,PM,1,,,PERM
  TBDATA,1,FPX,FPX,FPX
  TB,PM,1,,,BIOT ! BIOT COEFFICIENT
  TBDATA,1,ONE
  
  ! Define linear elastic material for shell elements
  MP,EX,2,0.1 ! YOUNG'S MODULUS
  MP,NUXY,2,0.0 ! POISSON'S RATIO
  
  ! Select the solid elements you want to modify and assign material 1
  ESEL, S, TYPE,, 9991
  MPCHG, 1, ALL
  
  ! Select the shell elements you want to modify and assign material 2
  ESEL, S, TYPE,, 1, 12
  MPCHG, 2, ALL
  
  ! Select all elements
  ESEL, ALL
  
  ! Continue with the solution phase
  /SOLU

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