Learning Forum

[yannic.j.gagnon.civ]

Hello,

I would like to model a carbon fiber composite with imperfect bonding between the polymer resin and the carbon fiber. I would like to control the interaction energy of the polymer/fiber and see how this interaction energy or degree of bonding influences the composite's properties, like the modulus of the composite along the fiber direction. So far I have been using the RVE feature in Materials Designer but I don't see a way to specify that I do not want perfect bonding between resin and fiber. Any sugestions on how to put in imperfect bonding would be much appreciated.

Thanks in advance,

Yannic

[Reno Genest]

Hello Yannic,

I don't think this can be done with Material Designer right now. Maybe in the future.

You want to model delamination between the carbon fiber and the resin correct? Does the delamination occur along the fiber at the fiber/resin interface? If so, you could use interface delamination or contact debonding in Mechanical (CZM or VCCT models):

https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v232/en/wb_sim/ds_geo_delam_debond.html?q=delamination

Note that with this method, the delamination occurs along a predefined interface (fiber/resin interface) and cannot propagate in a different direction.

So, I would try to build my own RVE using SpaceClaim or another CAD software. Then, import the RVE in Ansys mechanical, apply periodic boundary conditions, and perform the delamination analysis. You could then output the force - displacement and  calculate the Young's modulus.

If you Google "delamination ansys mechanical", you will find videos and more information on how to perform a delamination analysis in Ansys Mechanical.

If the deformation is severe and some fibers become loose, the Ansys implicit solver may have difficulties converging. An alternative would be to do this simulation with LS-DYNA explicit.

 

Let me know if this helps or not.

 

Reno.