Help on making ramps: aluminium tube deflection and welding
Hi. I am trying to make up 2 aluminium ramps out of aluminium and just wanted to double check that i was on the right track. I will be carrying granite benchtops on a trolley over them.
I have narrowed it down to maybe using 4 65x3mm square tubes with radius corners and diamond security mesh welded on top.
This has given the best deflection vs weight results while still being low profile.
I figured i could weld the security mesh on top without weakening the underside of the beams.
It is 6060 ali which is has 69.5 gpa or 69500 mm/2 modulus of elasticity.
I have been given the moments of inertia from a spec sheet which look like lx mm4 and ly mm4.
If it where a rectangle i would be using moment ly correct? This was 473924.0 mm4
Ramp length is 3500mm with 100kg of force on each beam
I have been getting deflections of 22mm with the single load calculator and 15 with the distributed load.
The line load has been giving me crazy answers. Not sure of i am doing it right.
I was diving the weight in KN by the contact in one direction that the trolley wheel makes with the ramp.
Looks like 5356 is the wire to use with extruded ali but i also have 4043 which is less prone to cracking.
The big one was how much deflection the beams can take before they get stressed so much that it causes fatigue.
Any help or advice would be great.
Cheers.