Viewing delamination/ matrix cracking in Abaqus?
Viewing delamination/ matrix cracking in Abaqus?
(OP)
After obtaining some results from impact simulation, how to observe the resultant delamination damage/crack damage, having inputted the resultant failure criterions like Hashin failure, Puck failure, and Interlayer damage (delamination).
Or will this be visible automatically by Abaqus.
My Supervisor suggest I study the stresses at each note and see the if that particular node failures or note by using the failure criterion.
This is will be time consuming...any help would be appreciated.
Thanks
Or will this be visible automatically by Abaqus.
My Supervisor suggest I study the stresses at each note and see the if that particular node failures or note by using the failure criterion.
This is will be time consuming...any help would be appreciated.
Thanks





RE: Viewing delamination/ matrix cracking in Abaqus?
Share some more details on how you are modeling this impact simulation:
- How are you modeling the composite plies? Solid or Shell? Layered elements (multiple plies in one element using a composite layup) or 1 element per ply?
- How are you using the Puck failure criterion? I know Hashin is available in Abaqus but Puck???
- How are you trying to capture "Interlayer damage"? VCCT, Cohesive Elements, Ply Stresses?
I should be able to help out here once I know more.
Regards
Firehole Composites
www.firehole.com
RE: Viewing delamination/ matrix cracking in Abaqus?
http://www.imechanica.org/files/Perillo_NTNU_final...
Am stuck at how to view the delamination as they have on page 13.
Thanks for your help
RE: Viewing delamination/ matrix cracking in Abaqus?
Firehole Composites
www.firehole.com
RE: Viewing delamination/ matrix cracking in Abaqus?
RE: Viewing delamination/ matrix cracking in Abaqus?
Thanks compositesFEAguru :)
RE: Viewing delamination/ matrix cracking in Abaqus?
PS (ignore the attachment for the previous comment, I typed it unknowingly)
Thanks
RE: Viewing delamination/ matrix cracking in Abaqus?
Firehole Composites
www.firehole.com
RE: Viewing delamination/ matrix cracking in Abaqus?
Thanks alot :)
RE: Viewing delamination/ matrix cracking in Abaqus?
1. Write (or obtain) a VUMAT. The output variables you view would be defined within the VUMAT and would have a SDV1, SDV2, etc. label.
2. Use a 3rd party software product for composite material analysis with Abaqus that contains the Puck failure criterion (an example would be Helius:MCT).
The Hashin failure criterion is integrated into Abaqus and has a matrix failure mode. You should read section 23.3.2 in the Abaqus Analysis User's Manual for details on how to define the Hashin failure criterion in your model and the output you should look at.
Firehole Composites
www.firehole.com
RE: Viewing delamination/ matrix cracking in Abaqus?
Output request hsnftcrt is not available for this option
When I remove the selection of HSNFTCT, HSNMTCRT, etc, the job runs fine until completed.
I tried using history output to and results just fine, however, they were in form of graphs which are of no particular good.
Any suggestion of how to overcome this?
As always, I can not express my gratitude enough for all your help thus far :).
RE: Viewing delamination/ matrix cracking in Abaqus?
*Damage Initiation
Everything under **Output Requests
(I'm assuming you created this input file using CAE)
Firehole Composites
www.firehole.com
RE: Viewing delamination/ matrix cracking in Abaqus?
*damageevolution, type=ENERGY
*density
*elastic, type=LAMINA
*mass, elset="ASSEMBLY_IMPACTOR-1__PICKEDSET6_POINT MASS_"
*surfaceinteraction, name="HARD CONTACT"
*shellsection, elset=ASSEMBLY_PART-3-1_COMPOSITELAYUP-1-1, layup=COMPOSITELAYUP-1, composite
*rigidbody, refnode=ASSEMBLY_IMPACTOR-1_IMPACTOR-REFPT_, elset=ASSEMBLY_IMPACTOR-1_IMPACTOR
*rigidbody, refnode=ASSEMBLY_IMPACTOR-1_IMPACTOR-REFPT_, elset=ASSEMBLY_IMPACTOR-1_IMPACTOR
*shellsection, elset=ASSEMBLY_PART-3-1_COMPOSITELAYUP-1-1, layup=COMPOSITELAYUP-1, composite
*mass, elset="ASSEMBLY_IMPACTOR-1__PICKEDSET6_POINT MASS_"
*rigidbody, refnode=ASSEMBLY_IMPACTOR-1_IMPACTOR-REFPT_, elset=ASSEMBLY_IMPACTOR-1_IMPACTOR
*initialconditions, type=VELOCITY
*initialconditions, type=VELOCITY
*elementoutput, directions=YES
*elementoutput, directions=YES
*rigidbody, refnode=ASSEMBLY_IMPACTOR-1_IMPACTOR-REFPT_, elset=ASSEMBLY_IMPACTOR-1_IMPACTOR
*output, field
*output, field, numberinterval=30
*output, history, frequency=200
*Step, name=Step-1
*Step, name=Step-1
3 sec
*dynamic, explicit
*output, field
*elementoutput, directions=YES
***ERROR: OUTPUT REQUEST HSNFTCRT IS NOT AVAILABLE FOR THIS OPTION
***NOTE: DUE TO AN INPUT ERROR THE ANALYSIS PRE-PROCESSOR HAS BEEN UNABLE TO
INTERPRET SOME DATA. SUBSEQUENT ERRORS MAY BE CAUSED BY THIS OMISSION
*output, field, numberinterval=30
*elementoutput, directions=YES
***ERROR: OUTPUT REQUEST HSNMTCRT IS NOT AVAILABLE FOR THIS OPTION
*output, history, frequency=200
*contactoutput, cpset=CONTACT
*endstep
*surface, type=ELEMENT, name=ASSEMBLY_IMPACTOR
*surface, type=ELEMENT, name=ASSEMBLY__PICKEDSURF88
*surface, type=ELEMENT, name=ASSEMBLY__PICKEDSURF268
*surfaceinteraction, name="HARD CONTACT"
*surfacebehavior, pressure-overclosure=HARD
*boundary
*boundary, type=VELOCITY
*Step, name=Step-1
*dynamic, explicit
*contactpair, interaction="HARD CONTACT", mechanicalconstraint=KINEMATIC, cpset=CONTACT
*output, field
*output, field, numberinterval=30
*output, history, frequency=200
*endstep
P R O B L E M S I Z E
NUMBER OF ELEMENTS IS 3030
NUMBER OF NODES IS 3084
NUMBER OF NODES DEFINED BY THE USER 3084
TOTAL NUMBER OF VARIABLES IN THE MODEL 17469
(DEGREES OF FREEDOM PLUS MAX NO. OF ANY LAGRANGE MULTIPLIER
VARIABLES. INCLUDE *PRINT,SOLVE=YES TO GET THE ACTUAL NUMBER.)
THE PROGRAM HAS DISCOVERED 2 FATAL ERRORS
** EXECUTION IS TERMINATED **
END OF USER INPUT PROCESSING
RE: Viewing delamination/ matrix cracking in Abaqus?
Firehole Composites
www.firehole.com
RE: Viewing delamination/ matrix cracking in Abaqus?
Many thanks!
RE: Viewing delamination/ matrix cracking in Abaqus?
Firehole Composites
www.firehole.com
RE: Viewing delamination/ matrix cracking in Abaqus?
I modeled the cohesive element as COH3D8... the elastic properties (E/Knn, G1/Kss, G2/Ktt) i used 25 because the time increment was no taking very long. I tried 50 and 100 and the time increment just too hours to finish.
I used the surface tie constrain between the layers (eg the cohesive element and the composite plies) , I did not use the nodes tie constrain, although my mesh is the same for the cohesive element and the composite.
The other thing I defined but not sure about is , the "general contact" I applied (I included a pic of the setting) http://files.engineering.com/getfile.aspx?folder=b...)
Is it possible to model the cohesive layer as a 2D planar?
Any suggestions?
As always thank you for all your help.
ps using cohesive surface gave this results :http://files.engineering.com/getfile.aspx?folder=0...
Which are much more sensible
RE: Viewing delamination/ matrix cracking in Abaqus?
I have a question relating to viewing the results....
It is possible to view the delamination through all the layer at the same time?
I can view damage on each individual layers , no problem.
or if I copy and paste the pics for different layers on top of each other and use some "transparency" photo editor to try and view the over all damage from all the layers...is this a good way to do it?
RE: Viewing delamination/ matrix cracking in Abaqus?
Firehole Composites
www.firehole.com
RE: Viewing delamination/ matrix cracking in Abaqus?