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I mean mostly from a crack propagation view rather than a fatigue hardening - I think it was that that did for my GB guard. I bolted it directly at the rear brake bridge and it split directly rear of the bolt hole. When I replaced it I put in some nitrile rubber leftover from flap making, was a good shout.
hamrack
The two materials do act differently to fatigue. Alu hardens (and will eventually crack). Steel should flex enough and survive ... forever basically.
{ pretty sure your aware of ^ this }
I guess it’s theoretically possible to isolate aluminium enough from bad vibes - I just think it isn’t practical.
I think plastic is the answer.