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CFVR8004 - Mohr-Coulomb

CivilFEM's Mohr-Coulomb equivalent to ANSYS's Drucker-Prager

Checking equivalence between the material models Mohr-Coulomb of CivilFEM and Drucker-Prager of ANSYS
It uses the following material models:

  • Mohr-Coulomb
  • Drucker-Prager

Element types used in the model: PLANE42,SURF153

Needed CivilFEM Modules:
Geotechnical Module
Bridges and Civil Non Linearities Module
Advanced Prestressed Concrete Module

The example can be launched on an educational license.
KEYWORDS
Materials
Geotechnics
Material Models

Model Statistics
Number of elements 2
Number of nodes 4
Number of civil materials 2
Number of cross sections 0
Number of shell vertices 0

Log file: CFVR8004.DAT


  FINISH
  ~CFCLEAR,,1
  NomFile='CFVR8004'
  /TITLE, %NomFile%, CivilFEM's Mohr-Coulomb

! ----------------------------------------------------------------------
! Initial data
! ----------------------------------------------------------------------
  ~UNITS,SI
  /PREP7

  HYP   = 0.     ! hyperbolic parameter
  ECC   = 1.     ! eccentricity parameter
  LENG  = 1.     ! length of the cube edge
  NDIV  = 1      ! number of division per side
  NTINC = 50     ! number of substeps per step
  FS    = 6.E+04 ! surface force
  INODE = 1      ! node for results checking

! ----------------------------------------------------------------------
! Model definition
! ----------------------------------------------------------------------
  LOCAL,11,0

  ! Materials

  ! Mohr-Coulomb
  ~CFMP,1,LIB,SOIL,,CL
  ~CFMP,1,SOIL,KPLA,,2
  ~CFMP,1,SOIL,KMCSP,,1
  ~CFMP,1,SOIL,HYP,,HYP
  ~CFMP,1,SOIL,ECC,,ECC
  ~CFMP,1,SOIL,IFLOW,,0
  ~CFGET,PHI,MATERIAL,1,SOIL,PHIMCeff

  ! Drucker-Prager
  ~CFMP,2,LIB,SOIL,,CL
  ~CFMP,2,SOIL,KPLA,,1
  ~CFGET,TMP,MATERIAL,2,SOIL,PHIMCeff
  ~CFMP,2,SOIL,DELeff,,TMP

  ! Element types

  ET,1,PLANE42
  KEYOPT,1,2,1
  KEYOPT,1,3,2

  ET,2,SURF153
  KEYOPT,2,2,1
  KEYOPT,2,3,2
  KEYOPT,2,4,1

  ! Geometry

  K,1,0,0
  K,2,LENG,0
  K,3,LENG,LENG
  K,4,0,LENG
  A,1,2,3,4
  LESIZE,ALL,,,NDIV

  ! Meshing

  LSEL,ALL
  TYPE,1
  AMESH,1
  TYPE,2
  ESYS,11
  LMESH,2

  ! Loads

  DL,1,,UY
  DL,4,,UX
  SFL,3,PRES,FS
  ! ESEL,S,TYPE,,2
  ! SFE,ALL,2,PRES,,FS

!-----------------------------------------------------------------------
! DATA CHECK
!-----------------------------------------------------------------------
! Data comparison number
  NCOMP    = 9
  NCOMP_CH = 0

! Array dimensions
  *DIM,LABEL,CHAR,NCOMP,1
  *DIM,LABEL_CH,CHAR,NCOMP_CH,1
  *DIM,VALUE,,NCOMP,3
  *DIM,VALUE_CH,CHAR,NCOMP_CH,3
  *DIM,TOLER,,NCOMP,2

! Labels
!-----------------------------------------------------------------------
  LABEL(1) = 'SZ'
  LABEL(2) = 'SY'
  LABEL(3) = 'SEQV'
  LABEL(4) = 'EPELX'
  LABEL(5) = 'EPELY'
  LABEL(6) = 'EPELEQV'
  LABEL(7) = 'EPPLX'
  LABEL(8) = 'EPPLY'
  LABEL(9) = 'EPPLEQV'

! Warning and error tolerances
  TOLER(1,1) = 1.E+3 $ TOLER(1,2) = 1.E+3
  TOLER(2,1) = 1.E+3 $ TOLER(2,2) = 1.E+3
  TOLER(3,1) = 1.E+3 $ TOLER(3,2) = 1.E+3
  TOLER(4,1) = 1.E-6 $ TOLER(4,2) = 1.E-6
  TOLER(5,1) = 1.E-6 $ TOLER(5,2) = 1.E-6
  TOLER(6,1) = 1.E-6 $ TOLER(6,2) = 1.E-6
  TOLER(7,1) = 1.E-6 $ TOLER(7,2) = 1.E-6
  TOLER(8,1) = 1.E-6 $ TOLER(8,2) = 1.E-6
  TOLER(9,1) = 1.E-6 $ TOLER(9,2) = 1.E-6

! Correct values
!-----------------------------------------------------------------------
  /SOLU

  SOLCONTROL,OFF
  NLGEOM,OFF
  NROPT,FULL
  NEQIT,50
  NSUBST,NTINC

  OUTRES,ALL,NONE
  OUTRES,NSOL,LAST
  OUTRES,ESOL,LAST

  /PREP7
  ESLA
  EMODIF,ALL,MAT,2
  ESEL,ALL

  /SOLU
  SOLVE

  *GET,VALUE(1,1),NODE,INODE,S,Z
  *GET,VALUE(2,1),NODE,INODE,S,Y
  *GET,VALUE(3,1),NODE,INODE,S,EQV
  *GET,VALUE(4,1),NODE,INODE,EPEL,X
  *GET,VALUE(5,1),NODE,INODE,EPEL,Y
  *GET,VALUE(6,1),NODE,INODE,EPEL,EQV
  *GET,VALUE(7,1),NODE,INODE,EPPL,X
  *GET,VALUE(8,1),NODE,INODE,EPPL,Y
  *GET,VALUE(9,1),NODE,INODE,EPPL,EQV

! Obtained values
!-----------------------------------------------------------------------
  /PREP7
  ESLA
  EMODIF,ALL,MAT,1
  ESEL,ALL

  /SOLU
  SOLVE

  *GET,VALUE(1,2),NODE,INODE,S,Z
  *GET,VALUE(2,2),NODE,INODE,S,Y
  *GET,VALUE(3,2),NODE,INODE,S,EQV
  *GET,VALUE(4,2),NODE,INODE,EPEL,X
  *GET,VALUE(5,2),NODE,INODE,EPEL,Y
  *GET,VALUE(6,2),NODE,INODE,EPEL,EQV
  *GET,VALUE(7,2),NODE,INODE,EPPL,X
  *GET,VALUE(8,2),NODE,INODE,EPPL,Y
  *GET,VALUE(9,2),NODE,INODE,EPPL,EQV

!-----------------------------------------------------------------------
! Results comparison
!-----------------------------------------------------------------------
  COMPARA.MAC

Results

LabelTargetCivilFEMRatioTolerance
SZ -34773 -347711.000 1000
SY -60003 -600041.000 1000
SEQV 52180 521801.000 1000
EPELX 0.0018954 0.00189531.000 1e-006
EPELY-0.0023046-0.00230471.000 1e-006
EPELEQV 0.002609 0.0026091.000 1e-006
EPPLX 0.0020886 0.0020881.000 1e-006
EPPLY-0.00091672-0.000916491.000 1e-006
EPPLEQV 0.0017354 0.00173491.000 1e-006


Contains proprietary and confidential information of Ingeciber, S.A.