*HEADING
 MEMBRANE ELEMENTS: MODEL CHANGE VERIFICATION, ELASTIC MATERIAL
*PREPRINT,MODEL=YES,HISTORY=NO
*****************
** TEST 1: CIN3D8
*****************
*NODE,NSET=NALL
1,0,0,0
2,1,0,0
3,1,1,0
4,0,1,0
5,0,0,1
6,1,0,1
7,1,1,1
8,0,1,1
**
11,0,3.0,0
12,1,3.0,0
13,1,3.9,0
14,0,4.0,0
15,0,3.0,1
16,1,3.0,1
17,1,3.9,1
18,0,4.0,1
*NSET,NSET=BOT
1,2,5,6,11,12,15,16
*NSET,NSET=LEFT
1,4,8,5,11,14,18,15
*NSET,NSET=TOP
3,4,7,8,13,14,17,18
*NSET,NSET=RIGHT
2,3,6,7,12,13,16,17
*NSET,NSET=TIP
13,17
*ELEMENT,TYPE=CIN3D8,ELSET=TEST1
1,3,7,8,4,2,6,5,1
11,13,17,18,14,12,16,15,11
*ELSET,ELSET=REFER
1,
*ELSET,ELSET=TEST
11, 
************************************************
**  REMAINDER OF INPUT DECK SAME FOR ALL TESTS
************************************************
*SOLID SECTION,MATERIAL=ELAS,ELSET=EALL
*ELSET,ELSET=EALL
TEST,REFER
*MATERIAL,NAME=ELAS
*ELASTIC
1000., .25
*EXPANSION
1.E-3, 
*DENSITY
1.E-3, 
*INITIAL CONDITIONS,TYPE=TEMPERATURE
NALL,70.
*AMPLITUDE,NAME=RAMP
0.,0.,1.,1.
**********************************************************
*STEP,NLGEOM
 STEP #1: DISPLACE TEST SPECIMEN SO FINAL SHAPE IS
          IDENTICAL TO INITIAL SHAPE OF REFERENCE ELEMENT 
**********************************************************
*STATIC
0.25,1.
*PRINT,MODEL CHANGE=YES
*BOUNDARY,OP=NEW
NALL,3
LEFT,1,2
BOT,1,2
RIGHT,1
TIP,2,2, 0.1
*NODE PRINT,NSET=LEFT,FREQ=999
RF, 
*NODE FILE,NSET=LEFT,FREQ=999
RF, 
*EL PRINT,ELSET=EALL,POSITION=CENTROID,FREQ=999
S,
E,
*EL FILE,ELSET=EALL,POSITION=CENTROID,FREQ=999
E, S
*END STEP
**
**
*STEP,NLGEOM
 STEP #2: REMOVE TEST ELEMENTS
*STATIC
1.,1.
*MODEL CHANGE,REMOVE,TYPE=ELEMENT
TEST,
*END STEP
**
**
*STEP,NLGEOM
 STEP #3: ADD TEST ELEMENTS BACK IN STRAIN-FREE
*STATIC
1.,1.
*MODEL CHANGE,ADD=STRAINFREE,TYPE=ELEMENT
TEST, 
*BOUNDARY,OP=NEW
LEFT,1
NALL,3
BOT,2
*END STEP
**
**
*STEP,NLGEOM,INC=100
 STEP #4: DISPLACE ELEMENTS
*STATIC
0.025,1.
*BOUNDARY,TYPE=VELOCITY
TOP, 2,2,-.01
*END STEP
**
**
*STEP,NLGEOM
 STEP #5: REMOVE TEST ELEMENT
*STATIC
.25,1.0
*MODEL CHANGE,REMOVE,TYPE=ELEMENT
TEST,
*END STEP
**
**
*STEP,NLGEOM,INC=100
 STEP #6: ADD TEST ELEMENTS BACK IN WITH-STRAIN
*STATIC
.025,1.0
*MODEL CHANGE,ADD=WITHSTRAIN,TYPE=ELEMENT
TEST,
*END STEP
**
**
*STEP,NLGEOM
 STEP #7: DISPLACE ELEMENTS FURTHER
*STATIC
.25,1.0
*BOUNDARY,TYPE=VELOCITY
TOP, 2,2,-.02
*END STEP