>I tend to believe that Carbon Fiber is a fine material to use.
For deep underwater?
Apart from the series of stupidities you go on to list, I'd love to hear your reasons as to why?
I'm a carbon f bike rider, even down to carbon spokes and I do not trust the material, knowing that pressure, or force, applied in the wrong direction will make it crack!.
As for carbon in a circle...no way.
I think it's not ideal in the same way that plastics don't belong in an automotive engine bay and concrete doesn't belong" in tension. Add a little bit of fancy chemistry or some steel and fancy math and they both work fine for cheap.
With care and engineering trickery CF in a submersible (compression) probably can work. They still managed to make a few good dives with it despite comically bad decisions in just about every key area. The manufacturing process was primitive, the QC basically nonexistent and procedures didn't make any allocations for the materials (they beat on the thing like it was made of steel). Imagine what a well funded company with experience in CF, robust QC and careful operating procedures could do.
A submersible constructed of carbon fiber went to depths that many metallic submarines and submersibles cannot.
If somebody constructs a submersible and then tests it to 5000m and finds it fails on the 200th run after exhibiting for the past 50 dives bad acoustic data. Wouldn't you think it's fine for them to take people on the same designed submersible that's only done 100th runs and still has good data?
Everything is a consumable in the long run. They didn't have data on what Titan looks like before a failure. Although in hindsight the acoustic data looks really bad, the issue really is just the specific design didn't have a known lifespan. A submserible without that defect is going to be a lot safer.
Trek 2100. The first carbon fiber bike affordable by upper middle class people.
Their trick was pre-formed carbon tubing glued to aluminum lugs. Sound familiar?
Good, because they had a massive recall because the carbon at the joinst started to chip and crack. Member of our club had to call a friend to come get him because his top tube came apart fifteen miles from town. Took em a while to replace it too. Eventually he ended up on a Serotta (Titanium with extra metalurgical tricks to make it lighter still).
I've linked this elsewhere in thread, but here's testing results from a US Navy pilot project for carbon fiber unmanned subs. It looks like this found it pretty viable.
What's the issue with CF in a circle? My bike is mainly CF (mainly just brakes and drivechain are metal) and of course that means CF wheels which I think are great (CF means that you can have deep section "aero" wheels without much of a weight penalty).
When carbon fiber rims were new we still had not transitioned to disk brakes. You had to keep an extra eye out for misaligned brake pads to make sure they weren't dragging on surfaces not meant for friction contact. Now they make more sense. But also different loads on a wheel under braking than before, but also more like a wheel under acceleration, which is torsional force on the other side of the axle and pointed the opposite direction.
For deep underwater? Apart from the series of stupidities you go on to list, I'd love to hear your reasons as to why?
I'm a carbon f bike rider, even down to carbon spokes and I do not trust the material, knowing that pressure, or force, applied in the wrong direction will make it crack!. As for carbon in a circle...no way.