5 votes

What is the best pattern of lightening holes to drill vertically (i.e. along the transverse plane) through a rod of aluminum

An axial hole. That is why prop shafts on cars and trucks are hollow. Even the transmission shafts between tractor to device, driven by the pto (power take off) are also hollow. Some are not round, ...
  • 14.2k
1 vote
Accepted

What is the most accurate mathematical model of a cantilever beam's bending?

Your question is quite broad. Accuracy depends a lot on the context, so I'll caveat my response by noting that the below is valid only for completely linear-elastic materials (no plastic behaviour ...
  • 101
1 vote

Is there any material that has a higher kinetic friction than static friction?

The numbers for static and kinetic friction in aluminum-on-aluminum interactions, cited by @albseb back in 2016, are unreliable. Strangely though, they're the only published values. I'm a physics ...

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