Mechanical APDL Basic Analysis Guide - Ansys

Chapter 4: Initial State
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4.7.4. Example: Initial Plastic Strain Problem Using the INISTATE Command
This initial plastic strain example is a simple 3-D problem where the cross section has three layers. An initial
plastic strain and stress are applied to one of the layers. One end of the block (shaped like a beam) is fixed
and the stresses are allowed to redistribute. The following input listing shows how to apply initial plastic
strain to one layer within a cross section and check the redistributed stresses.
/prep7
et,1,185,,2,1
keyopt,1,8,1 ! store data for all layers (can be excessive)
mp, ex, 11, 20.0e6 ! psi (lbf/in^2)
mp, prxy, 11, 0.25 ! unitless
mp, ex, 12, 20.0e6 ! psi (lbf/in^2)
mp, prxy, 12, 0.25 ! unitless
mp, ex, 13, 20.0e6 ! psi (lbf/in^2)
mp, prxy, 13, 0.25 ! unitless
! MISO material model
tb,miso,11,,3
tbpt,define,5e-5,1e3
tbpt,define,0.010,1e3
tbpt,define,0.600,1e3
! BISO material model
tb,biso,12,,1
tbdata,define,100,100000
! Plastic material model
tb,plas,13,,7,miso
tbpt,,0.0000,30000
tbpt,,4.00e-3,32000
tbpt,,8.10e-3,33800
tbpt,,1.25e-2,35000
tbpt,,2.18e-2,36500
tbpt,,3.10e-2,38000
tbpt,,4.05e-2,39000
sectype,1,shell,,my3ply ! 3-ply laminate
secdata, 0.30, 11, , 3 ! 1st layer THICK, MAT, ANG, Int. Pts.
secdata, 0.30, 12, , 3 ! 2nd layer THICK, MAT, ANG, Int. Pts.
secdata, 0.30, 13, , 3 ! 3rd layer THICK, MAT, ANG, Int. Pts.
! align esys with the global system
block,0,1,0,0.1,0,0.1
type,1
secnum,1
esize,0.1
vmesh,1
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/solu
antype,static
outres,all,all
! Uniaxial State Initial plastic Strain.
inis,set,mat,13
inis,set,dtyp,eppl
inis,defi,all,all,all,all,0.1,,,
inis,set,dtyp,pleq
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