Hello friends,
I have seen several examples for the CFRP model as the 2D plane in abaqus. In these examples the material properties are specified as Unidirectional 0 degree only. Even though they have layers of laminae with different orientation. Here is one of the example from abaqus manual.[ Alfano (2001). ]
http://abaqus.software.polimi.it/v6.13/books/bmk/default.htm?startat=ch02s07ach165.html
My question is that will the result gets differ for the same part with fiber orientation in 3D ? Why had he modeled composite as 2D plane in the orientation 0 degree only ?
I am doing the model of cohesive DCB. As still it is not possible to model composite in the 2D plane with fiber orientation in abqus.
i feel the results will be varied for the orientation in 3D but i suggest you to read the report publications related to your topic based on ABAQUS. Also, you may read the ABAQUS manual for further understanding on your work.
Hi Vinay,
I am not sure I understand exactly your question but I will reply mainly to your last sentence "As still it is not possible to model composite in the 2D plane with fiber orientation in abqus ".
In Abaqus you can still define a composite lay-up for different plies with different orientations. Please see link below from Abaqus manual:
http://130.149.89.49:2080/v6.7/books/usi/default.htm?startat=pt04ch21s05s02.html
Would this solve your issue?
Hi Vinay,
In abaqus, it is only possible the composite using 2D elements only (either using classical shell elements or continuum shell elements).
The fiber orientation, can be any orientations. You can specify them as you need through material orientations definition or compsoite ply setup in material module.
There are 2 possible ways to model composites in abaqus: 1. To model it as 1 layer of shell element and this element represent a set of ply with different orientations and 2. To model each ply of composite as a shell element.. and you stacked several shell element with other elements amd glue them with cohesive element to model delamination accurately. Using both approaches, in Abaqus you can only use Hashin failure theory.
why model 2d and not 3d? to save computattional efficiency.
will the result be different? it will be a slight different especially in modeling delamination. in 2d, the assumption is plane stress i.e. the out of plane stress is zero. the problem in transverse crack-induces delamination is usuallay triggered by out of plane stress (sigma_13, 23 or 33). If these terms are zero, then delamination prediction is not that accurate. Thats why we need 3D element to model ot accurately. But then you need to develop your own UMAT to be able to use it with 3D elements.
if you are beginners, check youtube on how to model composites using Abaqus. there are several good video tutorial in modeling composites using Abaqus.
Thank you all. :)
Meanwhile, I read the DCB test (EN6033) in detail. And, found that it suggest to put all the laminae orientations in 0 degress only, for DCB test.
Hence, the most of the models have been built as I stated in my question above. Also, the reason I discovered for a 2D model is the cohesive parameters need to be estimated after a lot of fine tuning (High computational time).
I will ask another question following up this, please also help me in that.
- Badges
- Science topic
- Similar topics
- Engineering
- Modeling