strut tower rip?
b.benz at charter.net
Sun Jan 30 10:22:21 EST 2005
A good analysis of the tower loading Eric. And there is the isolator issue
that the tower brace does not address, which further reduces negative
camber, my original design objective.
> From: Eric_R_Kissell at whirlpool.com
> Date: Sun, 30 Jan 2005 09:19:46 -0500
> To: CL Wong <montesawong at yahoo.com>, 200q20v at audifans.com
> Subject: Re: strut tower rip?
> I have been reading this thread and one thing occurs to me:
> The Bernie Brace is very easy to build - why don't more people have one?
> The strut tower cracking is a fatigue failure, which results from two
> things - cycles and strain.
> The Bernie Brace will reduce strain by spreading the stress between the two
> sides. Less stress means less strain.
> When Audi reinforced the V8 they changed the distribution of the stress as
> well, which would reduce strain in the area that seems to crack. This does
> not mean that the movement of the top of the strut was necessarily reduced
> a significant amount, though it may have been. I have not looked at a V8,
> so I cannot speculate. It may be that Audi was tired of the occasional
> crack through the hole so they redistributed the loading to reduce some of
> the strain at the area prone to cracking. Total movement of the top of the
> strut may or may not have changed much.
> The Bernie Brace makes a straight shot from the top of one strut to the
> other, so it is loaded as a column and thus very stiff. Note that the
> loading from side to side is always in compression, so column loading is
> appropriate. Any brace that does not go straight across will be loaded in
> bending and not as a column and thus need a lot more material arranged as a
> proper "truss" to be as stiff as the Bernie Brace. Furthermore, just
> stiffening the front of the strut tower will not provide that same
> stiffness to the rear of the strut tower and vice versa because of the
> "bending" or "rotation" of the strut tower front to rear. The Bernie Brace
> puts the extra stiffness right in the middle where it is most effective.
> Again, the Bernie Brace is a very easy part to make, so why not just add
> one and see what you think?
> Just wondering,
> 200q20v mailing list http://www.audifans.com/mailman/listinfo/200q20v
More information about the 200q20v