Originally Posted by hosejockey4506
i have seen alot of 3/16ths corners bend i was actually going to add tube to mine for extra support and im tying them into the cage from the inside 1/8th is no where nere enough metal not to bend in a hit. my aluminum tube was very bent when i got it from lanfing on a rock. and that 3/16 i believe.
I might opt for thinner steel with tube reinforcement in the right places. Regarding steel versus aluminum, here are some simple numbers to go by:
One advantage of steel is that between the yield point of mild steel (around 36,000 psi) and the ultimate tensile failure point (around 60,000 psi) there is quite a large plastic range (around 24,000 psi or roughly 40% of the ultimate strength), permitting steel to endure deflection without failure, so permitting considerable ability to absorb energy.
Aluminum 5083 H-116 plate, as an example, has a yield strength of around 34,000 psi and an ultimate strength of around 45,000 psi. You can see that the plastic range of aluminum is considerably less than steel (around 11,000 psi plastic range for aluminum, or roughly 24% of the material's ultimate strength).
So, that is one of the reasons that aluminum dents easier than steel. For a vehicle that was going to take abuse, I wouldn't use aluminum.