How to model delamination results from matrix cracking with XFEM?
Dear all,
I need to do 2D multicrack propagation in a composite laminate (GFRP) in tensile load. I have 3 parts namely (0-90-0 degrees plies). And I already have existing cracks which you can see below in attached pictures. Cracks propagate well, but when it comes to the boundary I couldn’t see correct delamination behavior. Is it possible to simulate delamination because of matrix cracking in Abaqus? I both tried cohesive surface and elements. With the elements it says I cant define XFEM crack zone for the cohesive element. With the surface, during loading I see some overclosures and clearances.
Here are my material properties.
Cohesive Surface:
Knn=Kss=Ktt= 1e6 N/mm3 (which I am not so sure)
Damage Initiation: Maxs damage initiation criteria Normal=Shear1=Shear2=3.4MPa.
Damage evolution criteria: Mixed mode behavior=BK(Power=2.2)
Fracture energy: Normal=Shear1=Shear 2= 0.27 N/mm2.
Also, frictionless tangential behavior, and hard contact.
For 0 degrees ply
Damage Initiation: Maxps=807MPa
Damage evolution criteria: Mixed mode behavior=BK(Power=2.2)
Fracture energy: 0.5, 0.5, 0.01 N/mm
Elastic, type=ENGINEERING CONSTANTS 35100.,9600.,9600., 0.3, 0.3, 0.3, 4000.,4000.4000.,
For 90 degrees ply, I just swap E11 and E33 values, and maxps=15MPa
Can someone suggest me how I can model it and if my material properties are reasonable?
Regards
Berkay
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Good luck
Frank
Hi Mr. Atici
try this videos
https://www.youtube.com/watch?v=eEtVxAhExJA&t=61s
https://www.youtube.com/watch?v=AoXWD8oqe1o&t=14s
good luck
Abdessamad
Thank you Mr. Richter for your suggestion, i already did that. And i dont think it is related to my question Mr. Abdessamad, because i already can simulate XFEM crack propagation simulation. I have the problem with delamination part. If anyone can help me, it will be appreciated.
Thanks
Berkay Atici
your question is related to my Master thesis. please read my paper. CZM is the start for you.
Dear Mr Qaimari, i read your paper whose name is 'A FINITE ELEMENT STUDY ON THE INFLUENCE OF DELAMINATION SHAPE ON RESIDUAL COMPRESSIVE BEHAVIOR OF SINGLE AND MULTIPLE DELAMINATED COMPOSITE STRUCTURES'. I hope it is the one you mentioned. However, contact conditions( properties) for delamination are not mentioned there. Is there anyway to learn your contact properties?Or can you send me your Master thesis so that i can look? Because i also use cohesive zone (surface or elements) for delamination faces. However, I couldnt see proper delamination behavior, and i am thinking probably my contact properties is not correct.
Regards
Berkay Atici
i advice you befor going deep, do some tutorials, then you will not have this contact Problem. Delaminations means loss of contact between two layers. You should consider a plate with two thicknesses one should be weaker (thiner) for bending and you should define local imperfection two unstabilise the plate under load, there you can start with linear EV analysis to get information on the buckling mode and buckling load and so on.
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