Composite twill weave ply how to create.

Altair Forum User

Hi all,

 

Can any one tell me how to create the composite twill weave single ply. as shown in the attached image. which options can i use for creating this type of ply. please let me know which option can be used for it.

 

Thanks & regards.

Ashok.

 

<?xml version="1.0" encoding="UTF-8"?>

Altair Forum User

You can assume two plies with 0° and 90° orientation,assign thickness of half to each.

Altair Forum User

hi chaithanya, thanks for reply. i was worried whether that model will give the same or at-lease same mechanical properties, like strength, stiffness, etc.

Altair Forum User

Hi Ashok,

 

For woven fabric you may consider it as a bi-directional ply.

 

The material properties is what defines whether the ply is a uni-directional or bi-directional.

 

Fabric is considered as 1 single ply while its bi-directional nature is incorporated in the material properties. If E1 and E2 are equal or almost equal in material card then the ply is asummed bi-directional fabric and the reference material orientation is the longitudinal direction (or Major direction/load direction).

Altair Forum User

Hi Prakash,

 

Is there any thing wrong if we assume two plies with 0° and 90° orientation,assign thickness of half to each,in this case material properties will be defined as unidirectional ply.

what makes the difference?

Altair Forum User

Hi Chaithanya,

 

I don't think this will make a difference. 

 

^{In the below picture, You could see, we only have 0 deg and 45 deg plies in the card. In reality, two plies have a weft in their lateral directions.}

<?xml version="1.0" encoding="UTF-8"?>

Altair Forum User

Yes,the image attachment is a special case-Zone based modelling where 90°plies may not be present.Also,we can change the PCOMPG card,and set THETA to 90°

But we do define plies with 90° right. In fact its user's will to define the angle.