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Economical difference with high-pressure vessel design pressures for fixed volume

The most economical solution would be to parametrically search for the cheapest cylinder that will provide the required volume of gas (when discharged to a minimum pressure of 750 psi, as per your ...
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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, ...
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2 votes
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How to find the displacement of an arbitrary point on a spring?

You have to know (or make assumptions about) how the spring is constructed. If the spring is a nice uniform spring of the sort found in textbook illustrations, then you can figure that each section of ...
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2 votes
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Elongation due to self weight - why the load acting on an element is gradually applied load?

The "problem" is that you are solving a problem in the stationary regime, where dynamic effects are neglected. You are thinking on the transient regime. And in any case, if you consider even ...
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1 vote

Elongation due to self weight - why the load acting on an element is gradually applied load?

If you take a hammer and hit the end of a metal rod, it will ting. The noise is caused by the dynamical response. Once the noise has stopped, the rod is quiescent and the static solution is valid. So ...
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1 vote

Elongation due to self weight - why the load acting on an element is gradually applied load?

Yes if you attach the bar to the ceiling and release it very suddenly, then what you assume will happen and the bar will start to vibrate. You need to use stiffness tensor, mass tensor, and continuum ...
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0 votes

is a rebar arch structure a good idea?

It's a bad idea in general. You mostly need bending strength, a rebar, being a solid cylinder, has very low moment of inertia relative to it's weight. Further, welding rebar makes it brittle, so you'...
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