Hi everyone
Happy new and all that stuff, hope all is good out there.
I am searching for knowledge about fasteners in carbon, maybe you can help me.
This is for a motorcycle sub/rear frame I am making, but I think it would apply for any load bearing structure that attaches to another.
I plan to have titanium inserts in the laminate that will distribute the forces going from the rider to the steel frame.
As the plan is now no carbon will be between the bolt flange and the insert (on the outside of the laminate), and no carbon
will be between the insert and the attachment "ear" on the main frame.
You would see the insert on both sides of the laminate.
The insert will however have a greater diameter inside the laminate, as you can see on the little drawing I just made.
Blue is bolt.
Red is insert.
Green is attachment ear/steel frame.
Black is carbon and yellow is sandwish spacer in laminate..
The left on is how I plan to do it, and the right one illustrates the way I suspect is wrong to do it.
Looking at it it seems clear the the left one distributes forces better.
The question I ask my self for the right hand example is, is it good or bad to "squeeze"/ clamp carbon?
I guess it would be fine at first but destroy the laminate over time.
In the left one the gap on either side of the spacer that is filled with carbon will have a depth calculated on the thickness
of the plies of carbon I plan to use.
(right now the plan is 1 ply carbon, 1 ply diolen and 1 ply
stitched two layer unidirectional)
plus 1 - 3 tenth of a mm for the epoxy.
Is there a rule for diamater of the insert / thickness of laminate / bold size ?
Like a Quick Reference Guide.
OR, should I rethink and make a "glue-in" solution instead?
your comments please.
/Petter
http://motoform.blogspot.se