Composite analysis ...
 
Notifications
Clear all

Composite analysis on LS DYNA

 

Floz
 Floz
(@floz)
New Member
Joined: 4 weeks ago
Posts: 3
Topic starter  

Dear all, I’m a last year engineering student. And I have to do a scientific project on les dyna concerning laminated composite. 
the model is done with MAT 022 COMPOSITE DAMAGE. 
But I don’t know how to read results layer by layer, Which ASCII I need to choose for composite damage ? GLSTAT of course and MAT SUM, but I would like to see the strains layer by layer … 

Can you help me ? 

best regards 

 

Floz 


Quote




Negative Volume
(@negativevolume)
Guru Admin
Joined: 3 years ago
Posts: 517
 

Hi @floz

Have you reviewed the LS-Dyna material user manual for MAT 022 COMPOSITE DAMAGE? There are quite a few insights there that might impact how you are able to output data such as turning on lamination theory in *Control_shell and defining the appropriate number of integration points for your material. 

Is the model already simulated and modeled correctly (to your best knowledge), and you are just trying to retrieve results? If so, then you should start by adding all elements of the composite using *Database_history_shell and then make sure you export ELOUT ascii. Again, there are quite a few insights in the manual that would help you here and I'd be happy to answer specific questions regarding them. 


ReplyQuote




Floz
 Floz
(@floz)
New Member
Joined: 4 weeks ago
Posts: 3
Topic starter  

@negativevolume Hi,

Yes the model is done and I don't have to modify the model, I just have to know how to read results layer by layer on LS DYNA, and thanks for your answer !

I need to show the strains and stresses layer by layer, so if ELOUT ascii is necessary it's ok, and I have to add the database extend history if I understand ?

 

Thanks, Have a nice evening 😉


ReplyQuote




Negative Volume
(@negativevolume)
Guru Admin
Joined: 3 years ago
Posts: 517
 

@floz Right, so my question was targeted if the model was "done" then it already should of had the proper *Database cards defined so that you can extract the data. 

Any progress made on this?


ReplyQuote




Floz
 Floz
(@floz)
New Member
Joined: 4 weeks ago
Posts: 3
Topic starter  

@negativevolume Hi, I need to send my project for the end of this week, I added ELOUT, and Database_HISTORY_Shell as you said, I have some results I can see my 18 layers on the plot.

Each layer has 1 integration point ? That's why I have 18 IP to select?

But my last question is, how do I know if my composite will break? I saw that there is a failure criteria with the card *MAT_022 (chang-chang) but it's complicated to analyze with plots only.

It's a very complicated project when you have 0 knowledge in composite...

 

Thanks for your answer,

 

Floz


ReplyQuote




IceBreakerSours
(@icebreakersours)
Regular
Joined: 9 months ago
Posts: 55
 

The response is none of my business so consider this as food for thought: Making even an omelette in the kitchen can be complicated if I have never walked into a kitchen before. So, why should I bother making sushi and expect great results? Much easier and better for me to be humble.

In other words, failure of composites is a nontrivial undertaking and, depending on the ultimate question of interest and the resources available, you could spend a few days to a few years on it and end up nowhere near predictive capability. Just look at the results from Sandia fracture challenges.


ReplyQuote







Share: