F1 wishbone construction, a closer look

[Caito]

Thank you very much! I don't know much about all this stuff, but I do have great curiosity about them.


I'll keep an eye on the thread.

Bye!


Caito.-

[riff_raff]

Brian.G-

Please post more when you finish your "dissection". Like Tim.Wright, I'm curious why there is a bond line between the upper and lower sections.

I'd also be interested to see what the ply stack looks like (thickness, number of plies, percentage of uni's versus cloth, etc.).

Regards,
riff_raff

[mach11]

Wow... what a thread... Its really great and i am looking forward to gaining more knowledge on this topic...

Brain G, thankyou for posting those pics....

Thank You F1technical..

[F1 Oldtimer]

Brian G. you have a PM.

[Tim.Wright]

Brian.G-

Please post more when you finish your "dissection". Like Tim.Wright, I'm curious why there is a bond line between the upper and lower sections.

I'd also be interested to see what the ply stack looks like (thickness, number of plies, percentage of uni's versus cloth, etc.).

Regards,
riff_raff

One things thats always interested me is that the outer ply is always a woven fabric. I'm pretty sure the rest of the plies underneath are UD and I suspect the outer ply is a low modulus material only for damage protection to the highly stessed UD plies.

Unfortunately I don't really know a method of identifying UD from woven plies in a cured part. Any ideas?

Tim

[Brian.G]

Coming very soon guys, along with a pushrod dissection which Ill start another thread for

Brian,

[Belatti]

This nice thread makes me think how hard it is to design and build an F1 car.

To have the best car you have to have the best EVERYTHING, including wishbones. I you can see there are a million things you can optimize there.

I know good is enemy of perfect, but still I wonder the time/resource consuming thing this is.

[riff_raff]

Tim.Wright,

I'm not a composite structures guy, but my understanding is that the 45deg cloth plies are there to stabilize the uni plies in buckling. A typical laminate would have inner and outer 45deg cloth plies, with additional 45deg cloth plies inserted between every 3rd or 4th uni ply.

As for impact damage protection, the leading edge of the wishbone is the surface most likely to suffer impact. And that's where the bond line is located. But of course, from a purely structural standpoint, putting the bond line along the wishbone's neutral axis in bending is the best place for it.

riff_raff

[Brian.G]

Tim.Wright,

I'm not a composite structures guy, but my understanding is that the 45deg cloth plies are there to stabilize the uni plies in buckling. A typical laminate would have inner and outer 45deg cloth plies, with additional 45deg cloth plies inserted between every 3rd or 4th uni ply.

As for impact damage protection, the leading edge of the wishbone is the surface most likely to suffer impact. And that's where the bond line is located. But of course, from a purely structural standpoint, putting the bond line along the wishbone's neutral axis in bending is the best place for it.

riff_raff

Coming soon guys, got distracted, been working hard on a casting, the part below


BG

[ysyy88]

what is the rope used for?

By the way, is this wishborn in the front suspension or in the rear suspension?

[Ciro Pabón]

Wow. I haven't seen this thread, I must be blind. Beautiful.

I'm not talking entirely about the wishbone ("wishborn"? I like that typo). The most beautiful things are the ones we share. Thanks. I know this thread is going to be legendary.

[flynfrog]

Brian.G-

Please post more when you finish your "dissection". Like Tim.Wright, I'm curious why there is a bond line between the upper and lower sections.

I'd also be interested to see what the ply stack looks like (thickness, number of plies, percentage of uni's versus cloth, etc.).

Regards,
riff_raff

One things thats always interested me is that the outer ply is always a woven fabric. I'm pretty sure the rest of the plies underneath are UD and I suspect the outer ply is a low modulus material only for damage protection to the highly stessed UD plies.

Unfortunately I don't really know a method of identifying UD from woven plies in a cured part. Any ideas?

Tim

you can sand through the piles one at a time

[conni]

the rope as you call it are the kevlar wheel tethers, they are laid up into the outer cover and cured then bonded to the wishbone but the cover should come off with the use of a heat gun to soften the glue as you will struggle to cut through the kevlar as its what they use in the suites to stop you cutting your leg off with a chain saw

on a side note those with spherical bearings at each end do not bend at all but those that have a solid mount will have flexures built into the design to allow the last 4or5 inches to flex

conni

[PVDL]

Another fabulous thread by You.

We all owe you for your time and money spent towards our education! I for one will be sending you a PM to find out how I can contribute to the expense incurred for this post and the awesome head post.

Regarding the lower rear arm, the most highly stressed A-arm of the suspension, I am surprised at the quality of the leading edge joint. You would think this could be a potential stress riser even though its in the least flexed area.

I will be most interested to see the surface preparation/texture and coatings used for the bond of the metal parts to the laminates.


Cheers, Paul

[PVDL]

Oops, just realized this is years old!! Did the A-arm get dissected?

Paul