Talk Composites - The Forum for Advanced Composites

Carbon bicycle wheel de-laminating a little

http://www.talkcomposites.com/Topic34949.aspx

By kendokelso - 2/29/2020 3:46:09 PM

Hi there,

I bought some 2nd hand carbon rimed (braking surface too) bicycle wheels from eBay. The front one is showing what I believe is some signs of age and impact damage. I'd like to attempt to repair these but have never worked with composites before. I'm thinking of getting some low viscosity resin, trying to inject into any cracks / gaps with a syringe, bag and clamp and then sand down with high grade of wet or dry. 

Does that sound like it might work to someone more experienced than me? I'd spotted the product linked below and wondered is that the best thing to use to attempt the repair with?

Any help or advice welcome, I've attached an image to this thread also so you can hopefully see the issues I'm trying to correct.

Thanks in advance.

https://www.easycomposites.co.uk/300g-22-twill-kevlar-cloth
By Buchado - 3/1/2020 8:42:54 PM

 
kendokelso - 2/29/2020 7:14:14 PM
 
Lester Populaire - 2/29/2020 3:53:41 PM
 
kendokelso - 2/29/2020 3:46:09 PM
Hi there,

I bought some 2nd hand carbon rimed (braking surface too) bicycle wheels from eBay. The front one is showing what I believe is some signs of age and impact damage. I'd like to attempt to repair these but have never worked with composites before. I'm thinking of getting some low viscosity resin, trying to inject into any cracks / gaps with a syringe, bag and clamp and then sand down with high grade of wet or dry. 

Does that sound like it might work to someone more experienced than me? I'd spotted the product linked below and wondered is that the best thing to use to attempt the repair with?

Any help or advice welcome, I've attached an image to this thread also so you can hopefully see the issues I'm trying to correct.

Thanks in advance.

https://www.easycomposites.co.uk/300g-22-twill-kevlar-cloth


You need a very specialized resin to cope with the heat on a breaking surface. I only know of one resin that is not made for prepreging and has a Tg high enough that i would trust it, but can't think of the name now.

I wouldn't recommend to fix that, especially with no experience with composites.

Thanks for the info. I'm an engineer by profession, I've done all sorts of work with various materials and resins, just never composites. I suspect paying a professional for repair may cost more than the value of the wheel and if it's a write off now then I may as well have a go, at least after if the repair fails, the wheel will still be a write off but I'll have gained a little experience with resins and composites...that's my logic anyway...



Well, there must be a reason why the repair is expensive. I would bet on too much expertise necessary to properly execute it, or expensive materials (less likely).