Delamination progress of impacted Carbon Fiber Structures

[dernp]

Hey,
I got a problem concerning my simulation of impacted composite structures. (Abaqus CAE 6.10-1)

What I want to see:
- I want a fast simulation of a delaminated composite structure. The delamination is supposed to grow and to buckle.

My Problem:
- My Simulation takes to much time, due to rapidly decreasing increment sizes, due to diverging analysis.

My model:
- Multiple layers with specific orientations (engineering material)
- Contact interaction between layers
--- delaminated region: "direct" "hard" contact
--- region, delamination is supposed to grow in: cohesive behavior
- Compression pressure

I attached my .cae file, hoping u might find the reason, why my solution seems to be diverging, decreasing my increments to a minimum.
If you have any questions please ask.
And yes, I know that my mesh sizing is bad, but many papers wrote about one element in thickness direction of a layer.
Am I supposed to take different elements? Right now I took the C3D8R elements...
I'd be glad about any ideas u might have.
With best regards,
Patrick.

 

[rstupplebeen]

If your loading is a dynamic event (crash, impact) then Explicit is probably more appropriate than Standard. Even if this is quasi-static Explicit may still be better.

On BC-3 you are constraining all out of plane deformations which will eliminate any buckling mode.

I hope this helps.

Rob Stupplebeen

https://sites.google.com/site/robertkstupplebeen/

 

[dernp]

Hi rstupplebeen,
Thanks for the advice. With Abaqus/Explicit I get results but I can't tell, if they are the results I want to see. Furthermore I only get 20 different time steps to look at in my results... How do I get more of them?
And actually I do like the upcoming results due to the first local buckling behavior and the following damage progression.
Also I changed the element type to shell elements to avoid the side effects of bad shaped elements.
Do you have any further advices, how to improve the simulation?
(the laminate ist built [0/90/+-45]s with given delaminations inbetween.)
Im thankfull for every advice.
Best regards,
Patrick.
If U got any questions about my model, please just ask me, I hope I got the answers. Attached is my new model.

 

[dernp]

And other questions are:
How do I find the force when the first global/local buckling and/or the first failure occurs?
How can I inspect only one layer alone, suppressing the others in results? Like when I just want to see the 3rd layer.
Yeah, I think this are the most important questions right now for me.
With best regards,
Patrick.