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Trussing your axles 101

Thought this was an interesting read on strength:

10638915593_217089b393_b.jpg
 
Stomis said:
Thats not true at all. Tube is way more resilient to bending than solid stock because it has more surface area.
Click to expand...

If you look at the link posted you can see the relative strength increase in the same tube diameter as the wall thickness increases. This means that as long as the steel is the same grade, diameter, and hardness the solid stock is stronger. If total surface area affected the bending strength, a paper thin tube would be stronger than one with 1/4" walls and I'm pretty confident that isn't true.

In any case, I suspect axle truss is relying much more on tensile strength than bending strength because its connected to the axle at only the pumpkin and outer ends of the axle instead of all along the entire length.

In reality, you are pretty close though since the diameter of the part makes much more difference in its strength than the wall thickness.
 
bp71k5 said:
If you look at the link posted you can see the relative strength increase in the same tube diameter as the wall thickness increases. This means that as long as the steel is the same grade, diameter, and hardness the solid stock is stronger. If total surface area affected the bending strength, a paper thin tube would be stronger than one with 1/4" walls and I'm pretty confident that isn't true.

In any case, I suspect axle truss is relying much more on tensile strength than bending strength because its connected to the axle at only the pumpkin and outer ends of the axle instead of all along the entire length.

In reality, you are pretty close though since the diameter of the part makes much more difference in its strength than the wall thickness.
Click to expand...

Yes it is true you need to go up a size to gain said strength over solid bar but I mean lets be honest, wouldnt you rather go up to a 1.20 wall 1-1/4 than a lead anchor piece of 1in solid bar?
 
Stomis said:
Yes it is true you need to go up a size to gain said strength over solid bar but I mean lets be honest, wouldnt you rather go up to a 1.20 wall 1-1/4 than a lead anchor piece of 1in solid bar?
Click to expand...

The overall geometry of the truss design affects strength more than the material chosen does. Sometimes we tend to over analyze things on 4x4s when we're just going to overbuild them anyway. This is one of the cases where the details can really matter, though, as there is a lot of ground clearance to be gained or lost.
 
I always wonder about your 12 bolt,at the speeds you go and the jumps... do you ever worry about a failed c clip and loosing an axle.

Or do you got a fix for that??
 
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