*HEADING
: DEBONDING OF AN INTERFACE VIA CRITICAL STRESS CRITERION
** critical stress evaluated at a distance ahead of the crack tip.
***
*RESTART,WRITE,FREQ=1
*NODE
1,
121,12.,
2001,,10.
2121,12.,10.
2,0.,
122,12.
999, 12.0, 0.0
*NGEN,NSET=BOT
1,121,10
*NGEN,NSET=BOT2
11,121,10
*NGEN,NSET=TOP
2001,2121,10
*NFILL
BOT,TOP,4,500
*NSET, NSET=TERM2,GEN
41,101,20
*ELEMENT,TYPE=CPE4
1,1,21,1021,1001,11,521,1011,501
*ELGEN,ELSET=SOLID
1,6,20,20,2,1000,1000
*SOLID SECTION,ELSET=SOLID,MAT=ELASTIC
1., 
*MATERIAL,NAME=ELASTIC
*ELASTIC
1.E6,.3
**
*** Contact definitions.
**
*rigid body,analytical surface=asurf, REF NODE=999
*surface,TYPE=SEGMENTS,NAME=ASURF
START,-1.0, 0.0
LINE, 10.1, 0.0
*ELSET, ELSET=BOT
1,21,41,61,81
*surface, NAME=BSURF
BOT, S1
*SURFACE INTERACTION, NAME=BOTH
1.0, 
*CONTACT PAIR,INTERACTION=BOTH,SMALL SLIDING
BSURF, ASURF
*NSET,NSET=N41
41,
*NSET,NSET=N61
61,
*NSET,NSET=N81
81,
*NSET,NSET=N101
101,
*NSET,NSET=NREF
1,
***
**** Nodeset defining the bonded portion of the surface
***
*NSET, NSET=BOND
41,61,81,101
*INITIAL CONDITIONS, TYPE=CONTACT, NORMAL
BSURF,ASURF,BOND
**
*** step 1
**
*STEP, INC=10
*STATIC
8.0E-04, 9.9315E-04
*BOUNDARY
2001,2,2,0.3460
2021,2,2,0.3460
121,1,2
999, 1, 2
999, 6
*DEBOND,SLAVE=BSURF,MASTER=ASURF,TIME INC=.0002, FREQUENCY=1,OUTPUT=BOTH
0.,1.
.0002,0.,
*FRACTURE CRITERION,TYPE=CRITICAL STRESS,TOLERANCE=0.05,DISTANCE=4.0
2774.0, 1.E12,1.E12
*ENERGY PRINT
*EL PRINT
S,
E,
*CONTACT PRINT
CSTRESS,CDISP
DBT,DBSF,DBS
*EL PRINT,ELSET=SOLID
S,E
*OUTPUT,FIELD
*CONTACT OUTPUT, VARIABLE=ALL
CSTRESS,CDISP
DBT,DBSF,DBS
*OUTPUT,FIELD
*ELEMENT OUTPUT,ELSET=SOLID
S, E
*END STEP
**
*** step 2
**
*STEP
*STATIC
2.0E-04, 2.0E-04
*BOUNDARY
2001,2,2,0.4157
2021,2,2,0.4157
*DEBOND,SLAVE=BSURF,MASTER=ASURF,TIME INC=.0002, FREQUENCY=1,OUTPUT=BOTH
0.,1.
.0002,0.,
*FRACTURE CRITERION,TYPE=CRITICAL STRESS,TOLERANCE=0.01,DISTANCE=2.0
8363.0, 1.E12,1.E12
*END STEP
**
*** step 3
**
*STEP,, INC=10
*STATIC
2.0E-04, 5.0E-04
*BOUNDARY
2001,2,2,0.5899
2021,2,2,0.5899
*DEBOND,SLAVE=BSURF,MASTER=ASURF,TIME INC=.0002, FREQUENCY=1,OUTPUT=BOTH
0.,1.
.0002,0.,
*FRACTURE CRITERION,TYPE=CRITICAL STRESS,TOLERANCE=0.01,DISTANCE=0.0
43705.0, 1.E12,1.E12
*END STEP
**
*** step 3
**
*STEP,, INC=10
*STATIC
2.0E-04, 1.17685E-03
*BOUNDARY
2001,2,2,1.0
2021,2,2,1.0
*DEBOND,SLAVE=BSURF,MASTER=ASURF,TIME INC=.0002, FREQUENCY=1,OUTPUT=BOTH
0.,1.
.0002,0.,
*FRACTURE CRITERION,TYPE=CRITICAL STRESS,TOLERANCE=0.01,DISTANCE=0.0
43705.0, 1.E12,1.E12
*END STEP