Brittle cracking in brittle materials

Hi there,

I am trying to simulate a crack opening process in ABAQUS. I start up from a simple model of plate with a notch subjected to tension. I would like to see the crack opening. To model a brittle mnaterial behaviour I have added a brittle cracking with sub-option brttle failure and brittle shear.

Please look at dat file:

*Heading

*Node

*Element, type=CPS3

*Element, type=CPS4R

*Nset, nset=ASSEMBLY_PART-1-1__PICKEDSET2

*Elset, elset=ASSEMBLY_PART-1-1__I1

*Elset, elset=ASSEMBLY_PART-1-1__I2

*Elset, elset=ASSEMBLY_PART-1-1__PICKEDSET2

*Nset, nset=ASSEMBLY__PICKEDSET15

*Elset, elset=ASSEMBLY__PICKEDSET15

*Elset, elset=ASSEMBLY___PICKEDSURF14_S1

*Elset, elset=ASSEMBLY___PICKEDSURF14_S2

*Elset, elset=ASSEMBLY___PICKEDSURF14_S4

*surface, type=ELEMENT, name=ASSEMBLY__PICKEDSURF14

*surface, type=ELEMENT, name=ASSEMBLY__PICKEDSURF14

*material, name=MATERIAL-1

*brittlecracking, type=DISPLACEMENT

*brittleshear

*brittlefailure, cracks=1

*密度

*elastic

*solidsection, elset=ASSEMBLY_PART-1-1__I1, material=MATERIAL-1

*solidsection, elset=ASSEMBLY_PART-1-1__I2, controls=EC-1, material=MATERIAL-1

*sectioncontrols, name=EC-1, elementdeletion=YES

*solidsection, elset=ASSEMBLY_PART-1-1__I1, material=MATERIAL-1

*solidsection, elset=ASSEMBLY_PART-1-1__I2, controls=EC-1, material=MATERIAL-1

*solidsection, elset=ASSEMBLY_PART-1-1__I1, material=MATERIAL-1

*solidsection, elset=ASSEMBLY_PART-1-1__I2, controls=EC-1, material=MATERIAL-1

*output, field, variable=PRESELECT

*output, history, variable=PRESELECT

*Step, name=Step-1

*Step, name=Step-1

*dynamic, explicit

*boundary

*dsload

*output, field, variable=PRESELECT

*output, history, variable=PRESELECT

*endstep

*surface, type=ELEMENT, name=ASSEMBLY__PICKEDSURF14

*Step, name=Step-1

*dynamic, explicit

*boundary

***WARNING: THE OPTION *BOUNDARY,TYPE=DISPLACEMENT HAS BEEN USED; CHECK STATUS

FILE BETWEEN STEPS FOR WARNINGS ON ANY JUMPS PRESCRIBED ACROSS THE

STEPS IN DISPLACEMENT VALUES OF TRANSLATIONAL DOF. FOR ROTATIONAL

DOF MAKE SURE THAT THERE ARE NO SUCH JUMPS. ALL JUMPS IN

DISPLACEMENTS ACROSS STEPS ARE IGNORED

***WARNING: DEGREE OF FREEDOM 6 IS NOT ACTIVE IN THIS MODEL AND CAN NOT BE

RESTRAINED

*output, field, variable=PRESELECT

*output, history, variable=PRESELECT

*endstep

- (RAMP) OR (STEP) - INDICATE USE OF DEFAULT AMPLITUDES ASSOCIATED WITH THE STEP

P R O B L E M S I Z E

NUMBER OF ELEMENTS IS 511

NUMBER OF NODES IS 557

NUMBER OF NODES DEFINED BY THE USER 557

TOTAL NUMBER OF VARIABLES IN THE MODEL 1114

(DEGREES OF FREEDOM PLUS MAX NO. OF ANY LAGRANGE MULTIPLIER

VARIABLES. INCLUDE *PRINT,SOLVE=YES TO GET THE ACTUAL NUMBER.)

END OF USER INPUT PROCESSING

JOB TIME SUMMARY

USER TIME (SEC) = 0.13000

SYSTEM TIME (SEC) = 4.00000E-02

TOTAL CPU TIME (SEC) = 0.17000

WALLCLOCK TIME (SEC) = 1

*Brittle Cracking, type=DISPLACEMENT

3e+06, 0.

3e+06, 1e-05

*Brittle Shear

1., 0.

0.5, 1e-06

0.01, 1e-05

*Brittle Failure, cracks=1

1e-05,

The analysis is completed byt I cannot see the crack opening