Codes often require at least one thread beyond the nut.
One thing I've noticed in practice is that if a nut and bolt aren't well machined that the nut can slip anyway, yielding the threads before yielding the bolt.
It’s only fair, Greg. The synchronous condensers replace the inertia of those “dirty” fossil fuels and it’s those dirty fossil fuels that should pay! 😉
The weave is bidirectional, like shirt fabric, designed to resist both hoop and axial stresses.
That said, the cylinder didn’t rely on the domes for buckling restraint, the domes merely capped the ends and transferred axial load into the hull.
Still, the strain mismatch at the junction, where...
Yes, the joint is a question mark and might’ve contributed. But we’ve got clear evidence the carbon fibre hull was cracking badly, and those cracks were getting worse with every dive. That’s not speculation, that’s documented. The previous hull was cracking to pieces, far from the joints. So...
Agree.
Cyclic testing is what it needed in my view. Cycle the pressure thousands of times and see what the cracks do. They’d actually already done that indirectly with the first hull; but turned a blind eye by the looks of things to all the horrible cracking that was occurring.
I think the documentary glossed over the design and development process a little. It made it seem like, after a few early test failures, Stockton Rush jumped straight into a full-size sub. But if you look closely, those early failures appeared to involve failed carbon fibre end caps. Presumably...
A fair assessment.
For all the valid criticism Stockton Rush cops, playing Russian roulette with peoples lives, I can’t help but feel some level of admiration for him. Utterly reckless, but bold in a way most people just aren’t.
Yes, and it would have caught a whole lot more things too, things that in Rush's view were pedantic "safety" stuff. That's why he didn't want it classed. Classing was far too conservative from his point of view.
It was clearly a fatigue failure. With each dive further damage occured. As Brian Malone mentioned you could hear this cumulative damage occuring all the way down. Crack, bang.
The severe cracks in the old hull told the story of what was happening with all the creaks and groans. It was the...
I’m not too concerned about the holes either.
For very modest torsional loads I agree the bi moment approach is fine. Same as you might check a channel for incidental torsion. The span makes a big different. Open sections are often ok for short lengths of torsion, before the torsional stiffness...
I just watched the Netflix one. It wasn’t bad. Lots of condemnation of Rush as you’d expect.
The acoustic monitoring system was interesting. Lots of creaks and bangs happening all the time, with every dive, indicating cumulative damage. The hulls never “settling down” so to speak. Seeing the...
