Tourist submersible visting the Titanic is missing 101

[MJCronin]

CNN Article about OceanGate

The company has completed a number of dives to the bottom of the North Atlantic. At least 28 people visited the Titanic with OceanGate last year, according to a November court filing from an adviser to the company.

Some expeditions were delayed after OceanGate was forced to rebuild the Titan’s hull because it showed “cyclic fatigue” and wouldn’t be able to travel deep enough to reach the Titanic’s wreckage, according to a 2020 article by GeekWire, which interviewed the company’s CEO.

But according to the metro.co.uk website, the vehicle has been to the TITANIC wreck, three times:

The Titan has made the voyage to the Titanic three times, once a year since 2021.

Soooo ... possible hull rebuild a couple of years ago ?....... Multiple yearly trips with 6-7 people .... Something is wrong here ...

__________________________________________________________________________________________________________________________________________

https://www.cnn.com/2023/06/21/us/o...ny has completed a,an adviser to the company.

https://metro.co.uk/2023/06/22/how-...year since 2021.&text=This is a modal window.

MJCronin
Sr. Process Engineer

 

[1503-44]

goto

https://www.marinetraffic.com/en/ais/home/centerx:-49.9/centery:41.7/zoom:10

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[electricpete]

More details about the debris field.

https://www.bbc.com/news/world-us-canada-65991651

Dive expert David Mearns told the BBC the president of the Explorers Club - which is connected to the diving and rescue community - says the debris includes "a landing frame and a rear cover from the submersible".

The US Coast Guard earlier confirmed a "debris field" had been found within the search area.

It was located by a remote-controlled underwater search vehicle (ROV) near the wreck of the Titanic.

 

[TugboatEng]

A question. With tubes containing pressure, as I understand, there is a certain point where increasing wall thickness no longer increases the pressure rating. There is a section of a large cannon breach near here and you can see that the breach has a core and an outer cover that is shrunk over it. I'm guessing this is a workaround for that problem.

Does this same rule apply to tubes resisting external pressure? A diminishing of returns as wall thickness is increased?

 

[Cool_Controls]

I wonder if any data will be retreviable from thr titans "real-time hull health monitoring (RTM) system"?

 

[dik]

I've not heard of that; is there anyone that can provide added info? I'm not disagreeing with you Tug. I just don't know and want to find out.

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[1503-44]

For internal pressure of a thick walled cylinder, hoop or tangential stress is higher at the inside radius, one being tension, the other compression, Mohr's circle, containing both the (-) radial and (+) tangential circles, shear stress becomes large on the inside face. The outside face would not control.

The outside sleeve cylinder of your cannon was heated and then shrunk into place, putting the inside cylinder in an initial compressive state, a prestressing for cannon barrels, reducing initial 0 stress to compressive stress, thereby allowing that much more tension in the inside (crditical) cylinder when the explosives go off.

Not an expert on external pressure, but basically the reverse situation, high radial stress on the outside, 6000 psi, 15 psi on the inside and compressive tangential stresses, but buckling is often initiated before actual shear failure by defects and other nonconformaties, so its not linear.

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[thebard3]

Incredible that they found it. I'm wondering if there was some acoustic event detected that they were able to triangulate? Finding a debris field in the vicinity of Titanic is like finding milk in the milk case at the grocery store.

Brad Waybright

The more you know, the more you know you don't know.

 

[dik]

Thanks 1503...

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[kjoiner]

I don't have access to TV but I was just told the Coast Guard announced they found 5 pieces of the sub in a debris field - nose cone, front part of hull and tail cone.

Kyle

 

[JStephen]

I'm wondering now if anyone on board that ship heard the "ploop" when it imploded, seems like that would be a fairly violent event comparable to a bomb going off in reverse.

 

[boofi]

Yes, press conference with the USCG concluded. They believe all 5 are lost unfortunately. Likely case was an implosion. They are wishy washy on when the implosion occurred, but I assume it had to have been before the plane were dropping sonar buoys otherwise it would have been fairly obvious.

1. Does anybody have experience with carbon fiber behavior in external pressure scenarios? I know it's been used for internal pressure, like PVs for hydrogen

2. Likelyhood of recovery of any parts of the submersible for failure analysis? Will salvage/recovery teams try to obtain some of the wreckage?

 

[Tomfh]

So the supposed banging was just a red herring? Some other noise?

 

[TugboatEng]

Maybe some automated mechanisms in the tail cone operating.

 

[ctopher]

Without proper equipment, it could be difficult to triangular their location.
I've been on sub's before. I remember them adjusting the frequencies depending on the depth/speed.

Some info:

https://oceanexplorer.noaa.gov/explorations/sound01/background/acoustics/acoustics.html

Chris, CSWP
SolidWorks
ctophers home

 

[SWComposites]

Does anybody have experience with carbon fiber behavior in external pressure scenarios? Yes, some experience with externally pressurized cylinders; lots of experience with compression loaded structures in general. As I stated above, designing composites for compression loading is a lot more difficult than for tension loading. And compression strength is typically a lot more sensitive to fabrication variations and anomalies, including fiber waviness (in-plane and thru-thickness) and delaminations.

 

[Cool_Controls]

I would assume recovery will be decided by the largess of oceangate`s investors, The cost of the search operation alone will likely send the company into bankruptcy. A corporation`s first priority is generating a return on investment for its shareholders..

 

[dik]

Were the fees for the occupants a tax deduction?

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[dik]

Is there a formula for sigma r?

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[SWComposites]

dik - formula should be in Roark (Formulas for Stress and Strain) in the table for Thick Walled Cylinders.