Kevlar resistance

General Composites Discussions Composites Talk
#1

Hi all,

I’ve made some parts in Carbon/Kevlar for the motorcycle of a freind.
Unfortunatly, he has crashed his bike on track. The bike has slided on 5m on wet ground and here is the result !
I’m really suprised because this protection was composed of 5 layers of Aramid (170gr/m2) and 2 layers of CF (up and down).

Is there a way to be sure to not damage the motor ?
I can put 7 or 9 layers of aramide but when I see the picture I don’t think that it can arrange this.
Parts are made in infusion.

Thanks

Before:

After:

#2

Yes. Stop crashing the bike. :smiley:

#3

that’s what I said to my friend :smiley:

#4

throwing it down the road…

#5

Composite parts can be light and strong but not indestructible. You could use heavy gauge steel.

#6

I do not thinks it is realistic to expect the part to withstand that sort of impact, fit the bike with crash bungs and make sure when the bike goes over they will contact the track first.
Regards Chris
www.bartonphoenix.moonfruit.com
www.carbonfibreworks.co.uk

#7

Thanks, I think you’re wright, parts can’t be industructible.
They can always protect one time, the role is to not drill crankcase and put oil on track.
After one crash you must change the protection.

#8

Desmo-

I know this was a big problem in Moto2 a couple years back, which sparked a new wave of engine case protection. The biggest design factor is the sanding action of sliding along the asphalt. Carbon fiber is a bad choice for protection from sanding…but its light and looks great. Kevlar is better but its big advantage is its toughness which helps with impact resistance.

This company won the FIM approval for case covers at the world level motorcycle racing scene: http://www.gbracing.eu/newsdesk_info.php?newsdesk_id=51

I believe they use a special nylon reinforced injection molding process.

If you’re set up for composite work then i was thinking you could try to incorporate a pad of brushed titanium on the outer layer of your cover. That would look sweet and spray some white sparks the next time your buddy crashes!..It could look like the elbow and shoulder protectors on a Dainese race suit!

Nice looking parts by the way…

-Kyle-

#9

Thanks Kyle,

I’ve GB Racing parts on my 1198RS engine.
Nylon is a really good material for this use, I don’t know if there parts are reinforced.

For the time a only make composite parts and I’ve tried to put more kevlar layers.
Put a piece of titanium, why not but how to justify the price :frowning:
I already test protection on the dainese suit and it works :slight_smile:
But forms on my parts can’t accept this type of material, I only have curves.

#10

Have you tried Diolen? I did a small test using a die grinder with an abrasive wheel. It was quite a lot better than the protector I made using kevlar. As it is a plastic based material it heats up with abrasion and will self heal up to a point before it wears through. It seems to be the best compromise I have tried so far.