*HEADING
Pre-tension Section Test [XPTSSE2Z]
Procedures Tested: Static
Elements Tested: CPE4, with CPE3 substructures
 SUBSTRUCTURE GENERATION FILE xptssi2z_gen1.inp SHOULD BE RUN FIRST. 
**
*PREPRINT,MODEL=YES,HISTORY=YES
*RESTART,WRITE
*NODE
       1,          0.,          0.
       2,          1.,          0.
       3,          0.,          1.
       4,          1.,          1.
       7,          0.,          2.
       8,          1.,          2.
** pre-tension section nodes
*NODE,NSET=NREF
    1001,          0.,          0.
**
*ELEMENT, TYPE=CPE4, ELSET=ECPE
       1,       1,       2,       4,       3
       2,       3,       4,       8,       7
*SOLID SECTION, ELSET=ECPE, MATERIAL=MAT
1.0, 
*MATERIAL,NAME=MAT
*ELASTIC
1.E5,0.
*ELEMENT, TYPE=Z1, ELSET=ES1, FILE=xptssi2z_gen1
       3,       1,       2,       3
*SUBSTRUCTURE PROPERTY, ELSET=ES1
*ELEMENT, TYPE=Z1, ELSET=ES2, FILE=xptssi2z_gen1
       4,       2,       1,       4
*SUBSTRUCTURE PROPERTY, ELSET=ES2
0.,0.,0.
0.5,0.,0.,0.5,1.,0.,180.
**
** Node Sets for Boundary Conditions
**
*NSET, NSET=XSYMM
       1,       3,       7
*NSET, NSET=YSYMM
       1,       2
*NSET, NSET=NPULL
       7,       8
**
** Pre-tension Section
**
*surface,NAME=SCPE
1,S3
*PRE-TENSION SECTION, SURFACE=SCPE, NODE=1001
**
** Analysis
**
*STEP
pre-tension section by tightening
*STATIC
*BOUNDARY
XSYMM,1,,
YSYMM,2,,
NPULL,2,,
NREF,1,,0.1
*NODE FILE
U,RF
*SUBSTRUCTURE PATH,ENTER=3
*OUTPUT,FIELD,VAR=PRESELECT
*NODE FILE
U,RF
*EL FILE
S,E
*EL FILE
S,E
*SUBSTRUCTURE PATH,LEAVE,ENTER=4
*OUTPUT,FIELD,VAR=PRESELECT
*NODE FILE
U,RF
*EL FILE
S,E
*EL FILE
S,E
*SUBSTRUCTURE PATH,LEAVE
*END STEP
*STEP
further loading from initial tightened state
*STATIC
*BOUNDARY
NPULL,2,,0.1
*ENDSTEP