texgen help regarding compression of composite material

[piyu.uniyal]

hello everyone. hope you are in good health and doing good.
I am new in texgen and working on composite material project. for learning, I am working on this paper.http://www.sciencedirect.com/science/ar ... 2814005513
i would be grateful if you could help me to reproduce results of this paper.

kind regards
piyush

[louisepb]

Hi Piyush,
I've answered your private message. Let me know if you have any more specific queries on this.
Best regards,
Louise

[piyu.uniyal]

Hi Louise,
Thank you very much for your kind attention. I found TexGen very helpful for FEA of weave composites. I have calculated effective material properties of composite by running script 'effectiveMatPropRVE' and it produces very realistic results.
Now I want to perform compression of single-layered composite but I didn't found any proper documentation for the procedure. I tried it many times with different methods but didn't get any fruitful results. I have following doubts regarding compression test-

(1) Which Abaqus file should be export- Abaqus dry file or Voxel file(since this file do not have compression plate option)
(2) What scale should be chosen for compression in Z direction in the case of Abaqus dry file format?
(3) Do I need to define Load and boundary condition by myself for analysis or these are predefined as in the case of calculation of effective material properties?

I would be grateful for you if you can provide some guidance regarding to compression test.

Kind Regards,
Piyush

[louisepb]

Hi Piyush,

Could you confirm whether you are wanting to perform analysis on the composite or dry fabric? The paper you have cited is performing compression on the dry fabric and would have used the Abaqus Dry Fibre export function. This produces a conformal mesh of just the fabric and can apply compaction plates and allows specification of scales which give the amount of tension/compression in the analysis.

If you want to simulate compaction of the composite then you will need to use another method. You could either use the voxel or volume export and then edit the .inp file to add compaction plates and specify the step and boundary conditions.

Best regards,
Louise

[piyu.uniyal]

Hi Louise,
Thank you very much for your help. I want to do compression of dry fibers as done in attached paper but I am facing following difficulties-
(1) All material properties(E1,E2,E3,....) are not exported to .inp file. Only E and Poisson ratio is exported. So how to assign orthotropic properties to yarn.

[louisepb]

Hi Piyush,
You're right all of the material properties are not set up in the dry fibre export. This is something that I need to look at.
The easiest thing to do is to edit the .inp file and enter the properties manually. If you want an example of how to do this create a voxel export file and look at the materials section in that.

Hope that helps,
Louise

[piyu.uniyal]

Hi Louise,
Thanx for your guidance. I have edited .inp file for dry fiber and put properties as in voxel file but simulation is not running. Whereas it is running properly for without edited file. So where I am doing wrong?

[louisepb]

Hi Piyush,

I'm afraid that I'm not an Abaqus expert so it may be useful to find someone in your organisation who can help with Abaqus related queries.
In the first instance though, if you look at the .dat file produced when you run the simulation this will show you any error messages and may direct you to the problem.

Best regards,
Louise

[piyu.uniyal]

Hi Louise,
Hope you are good. I have a doubt while assigning properties to yarn. If I assign properties to yarn by selecting SHIFT key, and I chose weft as well as warp yarns Then EX will be along the fiber and EY will perpendicular to fiber. Do I need to define properties to weft and warp yarn separately or TexGEN defines orientation by itself?

[louisepb]

Hi Piyush,

When you export the TexGen model you will see that a .ori file is generated. This contains the fibre orientations for each element.
When assigning the property for the yarn, EX is assumed to be longitudinal etc.

You can find the orientation at any point in the model using the textile.GetPointInformation function.

Hope that helps,
Louise

[piyu.uniyal]

Thanx Louise.