HYDRAULIC PRESS VS TITANIUM AND CARBON FIBER PIPE

We will test the strength of pipes made of different materials, titanium, carbon fiber, aluminum, steel with a hydraulic press

[genki]

Perfect video of why you don't make submarines out of carbon fiber.

[JinKee]

Hydraulic Press Channel: do NOT try this at home.

Stockton Rush: hold my gamepad

[harvindersingh]

This explains why Titan was never issued a certification of safety. James Cameron was always right about using titanium and stainless steel to build submersibles.

[Sandman_IX]

That blue little man is fighting for his life 3:42

[thomas]

For the people saying that carbon fiber underperfomed:
Remember that the advantage of carbon fiber is not its raw strength, but its strength to weight ratio. Titanium took 3x the force of carbon before it broke, but it also weighed 3x as much. Also keep in mind that these tests were strictly in compression, while carbon unquestionably performs its best in tension.

[jguo]

Do you happen to have an infrared camera? It would be very cool to see how temperature changes when different materials being pressed!

[JohnsonPecker-gc]

It would be interesting to see this with a thermal camera to see the heat build up and spread through the materials.

[prasann.]

Apple CEO watched this video before iPhone 15 launch 😂

[davuz]

"Don't repeat this at home"

Let me just pull out my hydraulic press real quick

[AlphaGeekPAV]

Note: that carbon fiber tube was likely _stronger_ than Titan's CF because it was woven in multiple directions (though, obviously, much thinner overall than Titan). But what people keep forgetting to mention about Carbon Fiber is the danger of *repeated stress*. It might handle a given level of stress once, twice, etc. but each time adds tiny fractures and eventually it fails *without notice*. That's why carbon fiber bikes need to be X-rayed for microfractures after any significant accident. _none_ of that was done for Titan after each dive.

[TotalAnomy]

One thing to note if you're watching this after the titan accident: notice that the hydraulic press starts applying less force to the material once it starts yielding. A hydrostatic column, in contrast, is not so kind

[JS-edhg]

Wow, these results completely surprised me with solid stainless steel taking that much pressure. Great video.

[julianreichwein]

Carbon performing rather low was to be expected. Because its strength results from the fibers being arranged in the direction of stress and then being pulled. It's like a rope: Strong if you pull on it but doesn't resist any squishing

[thedeergarden]

After watching this I’m amazed that the Titan was able to do as many dives as it did before it imploded.

[natevanlandingham]

Who would of thought this video would pop up 10 months later as a suggested one for me. This press guy hit a home run when he made this and didn't even realize it would take 10 months to really "blow up" 😮

[tonyc]

Curious, what is the material used for the base of the hydraulic press? It seems to hold up and not be marred with any of the test materials.

[nancymcmonarch]

So even aluminum is more pressure-resistant than CF? Damn! Those OceanGate fools would have had better chances in a giant Pepsi can.

[OldielocksNmo]

As a metallurgist and fdy engineer I pulled test bars all the time..the psi ratings depending on the alloys was important. Strength, ductility vs wear and fatigue in operation was crucial. CF has flat strength in stress, but no ductility and fatigues quickly. Test bar pulls gave you the boundaries of useage in desired applications.

[a-lcle]

it never ceases of being interesting just how some materials decide to react so violently

[granadosvm]

From the safety point of view, my main concern about carbon fiber is how minimum deformation it shows before coming undone.
For a vehicle like a submergible, the deformation from the titanium could mean when it starts showing material fatigue after multiple trips, there is a big chance it will be deformed and survive, allowing a post-submerging inspection to identify it's reaching its limits and decommissioning it before a fatal incident, while the carbon fiber looks for a submergible, it won't show any previous deformation until the trip when it suffers catastrophic failure..