To find the stresses on each leg, I had to go over the calculations for the IPE160 beam using the dimensions sandy published. This also gave me a chance to check sandy's answers (they are all correct). The calculations show that the maximum amount of stress experienced by any part of the legs is 4.818mpa. The lowest compressive yield strength for an aluminium alloy that I have come across is 105mpa, therefore this comfirms that the vast majority aluminium alloys would be able to be used on the legs.Now its just a question of finding the most cost effective one.
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