Material is nominal size (material is commonly under nominal size, but within material geometry specs, like. Vehicle load is a static distributed load in the middle of the longest tube and is 1/3 the tube length. Loading in the middle of the longest tube is a worst case for stress on a cage member. Square tube assumes bending with one side parallel to the load (think square vs diamond). The safety factors use the numbers in the table below for strength. Don’t forget that putting hard metal close to occupants is very dangerous, so the use of proper seating, restraints, padding and helmets should always be considered. The red arrow in the picture below is the load, maybe a rock or a stump. We chose the longest tube that is likely to hit during a roll (blue). #8x8 axle weight distribution calculator how to.
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