Basically just wondering what your guys thoughts are on them.
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Alumi Flex Tie Rods
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I would not buy tie rod that flexes to begin with.Last edited by Buffalo Phil; 02-02-2009, 11:20 PM.sigpic
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I think what they are trying to say is not that the aluminum tie rod is not stronger it is just more flexible. Steel Modulus of elasticity= 28.8x10^6 psi aluminum= 10.0x10^6 psi
therefor the aluminum will bend 3 times easier.
If you hit your tie rod hard enough to bend it back to the axle the aluminum one will spring back the steel one will stay bent. But it takes 3 times the force to bend the steel one back to the axle.
Hope this make some sense.
The Yield Strength will determine how far it can flex before it is permanently deformed. Since all steels have basically the same modulus of elasticity mild steel tie rod and a chromoly tie rod will both flex the same amount with the same amount of force but the chromoly can go further before it is permanently deformed.
Since the Modulus of Elasticity is lower for aluminum it by a 1/3 it will have 1/3 less internal stress then steel would bent the same distance but aluminum has almost half the yield strength as steel. I would have to calculate out exactly how much further the aluminum one can bend then the steel.
I Know home much you all like math. Who was a fan of math again.
Steel also has a larger Yield flat section than aluminum so once it has been permanently deformed it can bend a lot further before breaking unlike aluminum especially heat treated aluminum like T6 which you need to have any strength at all.
So you can permanently bend steel without loosing much strength i.e. roll cages.
If you made an aluminum cage you would have to make it you of annealed material and heat treat it when your done.
I personally like steel it is a hell of a lot easier to weld, modify and you can bend it back.
I would definitely make sure you have steering stops on both sides of your knuckle before adding a flexible tie rod. Bending the tie rod might over steer your knuckle causing the u-joint to bind.
I would recommend having 2 steering stops per knuckle anyways. Especial the people still running "Y" style steering linkage.RCrocs #123 Brown CJ-5
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