*HEADING
CRACK PROPAGATION ALONG AN INTERFACE VIA CRACK LENGTH VS TIME CRITERION
** Centre crack specimen: symmetry conditions taken into account.
*RESTART,WRITE,FREQ=1
*NODE
1,
25,24.,
201,,10.
225,24.,10.
999, 20.0,0.0
*NGEN, NSET=BOT
1, 25
*NGEN,NSET=TOP
201,225
*NFILL
BOT,TOP,4,50
*ELEMENT,TYPE=CPE4
1,1,3,103,101
*ELGEN,ELSET=SOLID
1,12,2,1,2,100,100
*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, 25.1, 0.0
**
*** Contact definitions.
**
*ELSET, ELSET=BOT, GEN
2, 11
*ELSET, ELSET=TOP, GEN
101, 114
*surface, NAME=BSURF
BOT, S1
*SURFACE INTERACTION, NAME=BOTH
1.0, 
*CONTACT PAIR,INTERACTION=BOTH,SMALL SLIDING
BSURF, ASURF
**
** Nodeset definitions for bonding
*NSET,NSET=BOND,GEN
1,11
15,25
*INITIAL CONDITIONS,TYPE=CONTACT, NORMAL
BSURF,ASURF,BOND
*NSET, NSET=NREF
13, 
*BOUNDARY
1, 2
25, 2
213, 1
999, 1, 2
999, 6
**
*** step definitions
**
*STEP,INC=20
*STATIC
8.0E-04, 0.001313
*DEBOND,SLAVE=BSURF,MASTER=ASURF,TIME INC=1.E-04
0.,1.
.0003,0.
*FRACTURE CRITERION,TYPE=CRACK LENGTH,TOLERANCE=0.01, NSET=NREF
1.1539E-03, 2.0
1.2298E-03, 4.0
1.2750E-03, 6.0
1.3125E-03, 8.0
*BOUNDARY
TOP, 2, 2, 0.2363
*ENERGY PRINT
*CONTACT PRINT
CSTRESS,CDISP
DBT,DBSF,DBS
*EL PRINT,ELSET=SOLID
S, E
*OUTPUT,FIELD
*CONTACT OUTPUT, VARIABLE=ALL
CSTRESS,CDISP
*OUTPUT,FIELD
*ELEMENT OUTPUT
S, E
*END STEP
**
*** step 2
**
*STEP,INC=20
*STATIC
1.0E-04, 0.001187
*DEBOND,SLAVE=BSURF,MASTER=ASURF,TIME INC=1.E-04
0.,1.
.0003,0.
*FRACTURE CRITERION,TYPE=CRACK LENGTH,TOLERANCE=0.01, NSET=NREF
1.3125E-03, 8.0, 1.3491E-03, 10.0001
*BOUNDARY
TOP, 2, 2, 0.45
*END STEP