Forming analysis of fabric fails 1

[skr3178]

Hi,
My attempt to form a knitted fabric has failed here. Attached is the video for reference. Here is a picture.

https://ibb.co/FJGVqZn

INP file

https://easyupload.io/gl0yym

I have used an upper die and a lower die to enhance the process.
I have posted the animation and the inp file for reference. What I would like to see in the model is the fabric being stretched as the forming takes place. To model the interaction between the fibers, I have used an beam(representing the fiber), embedded in a solid element of low stiffness to model the interaction between the fibers. Earlier, I tried modelling the knits as beam only and specified edge to edge contact. This seemed to fail to capture the interaction between the fibers. Any insight would be extremely valuable.
Thank you

 

[FEA way]

I don't know much about textiles but I'm not sure if this approach is correct. I noticed that you place a fiber modeled with beam elements inside another fiber modeled using solid elements. And both have the same cross-section diameter. You may have to use different approach to model this fabric. There is a book titled "Finite Element Modeling of Textiles in Abaqus CAE" written by I. Ciesielska-Wrobel. It may be useful for you.

 

[skr3178]

Thanks FEA way for your reply.
This modelling of fabrics is also pretty new for me. I tried several variations to make this work, and now this attempt is based upon a paper "FLEXIBLE COMPOSITES WITH KNITTED REINFORCEMENTS". In this paper they use ansys but the modelling technique is the same.

https://www.researchgate.net/publication/281750221_Flexible_composites_with_knitted_reinforcements

I have looked into the reference book earlier. There content there is pretty basic, haven not found any appropriate modelling strategy for this particular problem from the book.
I am still brainstorming ideas for a workaround to this problem. Any help would be appreciated.

Sincerely,
Skr

 

[FEA way]

Indeed the authors of this article use similar approach with fibre embedded in filler material. However, the diameter of the fiber is most likely smaller than the diameter of the solid filler. That’s important for contact conditions.