*HEADING

CAP PLASTICITY, TRIA-AXIAL COMPRESSION TEST, CAX4, LOAD CONTROL
*NODE
1,0.,0.
2,1.,0.
3,1.,1.
4,0.,1.
*ELEMENT, TYPE=CAX4, ELSET=EL1
1, 1,2,3,4
*SOLID SECTION, ELSET=EL1, MATERIAL=CAPL
*MATERIAL,NAME=CAPL
** The material data is chosen to give G = 5000.0, BULK = 10000.0,
** first yield in pure shear        at P =   0.0,  S12 = 100.0, 
** first yield in hydro compression at P = 270.0,  S12 =   0.0,
** first yield in hydro tension     at P =-300.0,  S12 =   0.0,
** first yield (P = PA)             at P = 120.0,  S12 = 125.0
*ELASTIC
12857.1429, 0.28571429
*CAP PLASTICITY
** COHESN, BETA,    BIGR,   EVOLPI,   ALPHA,   BIGK
173.20508, 30.0, 0.61858957, 0.027, 0.69258232, 1.0
*CAP HARDENING
** PB, EVOLP
 213.0, 0.00
 222.0, 0.01
 242.0, 0.02
 282.0, 0.03
 362.0, 0.04
 522.0, 0.05
 842.0, 0.06
1482.0, 0.07                                              
2762.0, 0.08
**
*STEP, INC=1, UNSYMM=YES
Step 1: Compression until P=PA
*STATIC, DIRECT
1.0, 1.0
*BOUNDARY
1, 1,2
2, 2     
4, 1
3, 2,2, -4.0E-3
4, 2,2, -4.0E-3
*DLOAD
1, P2, 120.0
*EL PRINT, F=999
S, 
SINV, 
E, 
PE, 
PEQC, 
*EL PRINT, POS=NODES, F=999
PEQC4, 
*NODE PRINT, F=999
U, 
RF   , 
*OUTPUT,FIELD,FREQ=999
*ELEMENT OUTPUT
S,SINV,E,PE,PEQC
*OUTPUT,FIELD,FREQ=999
*NODE OUTPUT
U,RF
*END STEP
**
*STEP, INC=10, UNSYMM=YES
Step 2: Increase S22 only
*STATIC, DIRECT
1.0, 10.0
*BOUNDARY
3, 2,2, -0.6
4, 2,2, -0.6
*END STEP