Titanic tourist sub goes missing sparking search

[wetb4igetinthewater]

He obviously believed in the hull being strong enough. (unless he was suicidal),

This is a question that will obviously never be answered, but on what basis did he believe his hull was strong enough?

 

[Wookie]

This is a question that will obviously never be answered, but on what basis did he believe his hull was strong enough?

It made 23 trips?

 

[wetb4igetinthewater]

It made 23 trips?

And what was the determined point of stress failure? I'm not a materials person, and I didn't stay at a Holiday Inn. I may know the person who supplied the carbon fiber, but I'm pretty sure he's not going to talk about it.

Everything fails at what point. The question is, what is the probability of failure over time? There's a reason why after 5 years subs are supposed to be completely taken apart, inspected, and then reassembled.

 

[Akimbo]

This is a question that will obviously never be answered, but on what basis did he believe his hull was strong enough?

It made 23 trips?

And what was the determined point of stress failure?

Commercial and military aircraft are tightly regulated based on flight hours and sometimes takeoff and landing cycles, largely due to material cyclic fatigue. The last 10 minutes of this video discusses it.

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[HalcyonDaze]

It made 23 trips?

I thought it was only 13 prior Titanic dives, not counting shallow test dives in Puget Sound and deep dives in the Bahamas. Were there 10 test dives?

 

[Dan]

And what was the determined point of stress failure?

Using carbon fiber composite hull as pointed by James Cameron around 7 minutes of video interview, below (posted by @O-ring upthread). Unlike metal that can go many pressure cycles (as long as the stress is applied under its yield stress and within the linear stress-strain curve), carbon fiber composite would delaminate and break like glass when pressure is applied from outside.

The right application of carbon fiber composite is when the pressure is applied from inside, like in the airplane hull.

 

[chillyinCanada]

For what it's worth, I concur with this analysis:

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One point is worth clarification, "off the shelf" components. A great number of "off the shelf" components are used in commercial and military aircraft, nuclear submarines, saturation diving systems, and DSVs (manned Deep Submergence Vehicle). However, there is a HUGE difference between industrial and Mil-Spec grade products like Swagelok, CPV, Airpax, and DG O’Brien versus consumer products like game controllers and big box hardware store parts.

Oh, he's angry

 

[Wookie]

I thought it was only 13 prior Titanic dives, not counting shallow test dives in Puget Sound and deep dives in the Bahamas. Were there 10 test dives?

Does the number matter?

 

[Wookie]

Does the number matter?

Actually, with Carbon Fiber (I’m no expert) the only thing that matters is the number.

 

[chillyinCanada]

Actually, with Carbon Fiber (I’m no expert) the only thing that matters is the number.

It was going to fail. The only thing that mattered was the time.