I wonder if we could overcome part of the brittle nature of CFRP by adding a middle layer of fiberglass fabric between our regular carbon layers. I heard somewhere that this would be beneficial to the overall mechanical strength of the part. I doubt it but i would like to hear your opinions on this.
Also what would happen by adding a middle layer of kevlar, not fiberglass. Thanks! 
IMO the main reason people think carbon fiber is brittle is because they just don’t make strong parts. Very few people make full carbon parts that are designed properly.
Yes, it’s brittle when it ultimately fails. BUT, it should take A LOT to make a carbon part fail.
Adding other materials in a laminate doesn’t really change anything. The carbon fibers will still snap. A kevlar ply will just keep the piece more intact.
TET is right…most peoples exposure to CF parts being brittle are from resin rich open mold wet lay-up production methods. Its that lower level of technique which gives CF a bad name in the end.
A properly engineered lay-up schedule and cross-linked directional fibers along with an Infused vac. environment delivers the next best thing to Autoclave and pre-preg.
But you can help yourself get the MOST out of any lay-up getting to know your parts requirements that it will see in its environment use.
Cosmetic only parts somewhat excluded…but still.
Not to go against what they said, because yeah, if you build it badly, it wil be brittle. We use glass for many things around here, including armor. Glass will stretch abit more, taking more of the load out of the carbon, kevlar will do the same, but even more so. The only reason to add kevlar to CF is for spall shielding, and wear resistance on the outside surface. Glass helps a slight amount against the catastrophic failures. Tons of papers written about what fibers do what in layups.
I wish we had an online library of this stuff. I can’t remember it all, but I know work is done on so many things!
but remember…if you sell a CF part with glass, TELL PEOPLE!