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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
*density
*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
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Comments
I have already solved my
I have already solved my problem :)
Hi Mr I want to define
Hi Mr
I want to define the SiC matrix of the C/SiC ceramic composite material ,and i want to use the brittle cracking model .But i can't make the inner relationship among brittle cracking ,brittle shear and brittle failure clear . And even I don't know how to define each parameter in the brittle cracking model , I don't know the rules .
I hope you can help me. Thank you very much!
Andrealina