HYDRAULIC PRESS VS TITANIUM AND STEEL BOLT, WHICH IS STRONGER

We will test the strength of titanium bolts from a spaceship with a hydraulic press. Which bolt is stronger titanium or steel

[jordanhannah]

"Do not repeat at home"

Me with no hydraulic press: Sure won't mate!

[Jacob-lejc]

“Do not try at home” me: (slowly puts away 100 ton press)

[Nick-cpwf]

100 steel bolts 🔩 would weigh around 1 kilogram. Imagine on a space ship 🚀 there may be a need for 20, 000+ of these bolts. That's 200+ kilos of steel. Titanium literally offers nearly the same strength but cuts the weight in half. This is significant.

[EgadsNo]

For a proper sheer test you really need to use a torque wrench if you are going to bolt plates together. The tensile force creates friction between the plates which counteracts the sheer force. Without them being equally torqued you cant be assured they are facing the same sheer force.

[Dudeman]

This lines up with what I've always known. Titanium is only really just a little stronger than steel for any given volume but MUCH MUCH lighter.

[johnbarron]

This is a cool test, although in the shear tests there are some unwanted effects. As the press pushes down on the upper plate, the offset force causes the plate to pivot outward, creating a gap that gets bigger and bigger as more force is applied. So the plate effectively turns into a pry-bar, pulling the bolt head in tension and bending it in addition to applying the shear force.

I think the test would be more representative of true shear if the shear load was applied by pulling on the plates, similar to the setup used for the tensile test.

Also titanium is about half as stiff as steel, so it stretched about double the amount before yielding, so the upper shear plate pivoted about twice as far, meaning the titanium bolt received more tension and bending load than the steel bolt during the shear test. Despite this, titanium still came out on top in the comparison!

[custodeon]

the fact that the cumulative shear strength of both bolts' threads was higher than the tensile strength of the main bodies fascinates and bemuses me

[thibautdeveraux]

Steel range from something like 300 to 2500 MPa of ultimate tensile strength depending on the exact alloy and treatment. Titanium resistance can also vary a lot depending on the alloy. So it depends... And the tensile strength is far from being the only criterion.

[anomamos]

The shear test was not optimal for the titanium as the washers needed to space it out didn’t provide enough support to keep the plates from deflecting.
There’s a shatter test for titanium fasteners, from what I have heard steel has a better shatter resistance.

[mixterx]

titanium alloy grades are infinitely variable.
making something from titanium does not make it stronger than steel.
the most necessary component of the titanium is it's light weight to strength in flight applications as well as being non magnetic for flight instrument interference.
your shear test was not equal / or sterile.
the threads of the steel bolt were being sheared while the unthreaded shank of the titanium bolt was under shear stress.
bolts intended for shear load have the applied load shearing on the shank - not on the threads.

[charlessekafetz]

The grade 8 that is being used is also a vented bolt. It is used in vacuum systems to prevent creating a virtual leak and to allow the bolt to be removed without it having a trapped vacuum underneath. The shear test in this case is very inaccurate due to this and the other reasons people have pointed out already.

[raysevrai]

8.8 screw : maximum traction 8 daN / mm²
elasticity 80% of 8 daN / mm² in traction
so if you use a 10.9 steel grade, it's strong as titanium. but heavier.

[badninja]

I never try these experiments at home, I always do them in a public area. 😂

[neilreid]

Fun vid. Learned years ago in a machine shop- titanium is the same strength as steel at half the weight. Cool stuff.

[jeanladoire]

I'm a blacksmith and had my tries at armor making. In buhurt (medieval armored combats), steel and titanium armors are used in competition. The thing is, titanium is less protective than steel.
Titanium, with the right alloys and tempering can have the strength of steel, for less weight. BUT it does not have its ductility. Titanium will flex, but will not bend, it will snap instead. Steel will flex too, but if overloaded it will deform, thus absorbing the energy like the chassis of a car. The strongest alloys of iron will be stronger than the strongest alloys of titanium however, but it's insignificant for most applications. Titanium is good for saving weight. But it is expensive as shit, and very hard to forge (weird heat treatment, springy while heated etc), steel is cheaper, strong too, but heavier. But it will bend when overloaded, wich can be life saving in some situations.

[joeprimal]

Thanks. I’d love to see a pipe vs a concrete filled pipe. The concrete filling should prevent the pipe from failure due to folding, but I’m curious just how big the effect would be.

[NeoArashi]

"Don't try this at home"

Bold of you to assume I have an hydrolic press hahaha

[thelokjohnson]

Glad to see this as a reference of my determination for buying iPhone 15😵

[joelunruh]

I love the VASSH "DONT YOU SEE" track in the beginning. Thank you.

[wholelottamiata]

It’s a misunderstanding that titanium is extra strong. It’s the strength to weight ratio that is superior to steel. Not the overall strength. A lot of this has to do with what alloys you’re talking about too but generally steel is stronger than titanium. Class 8.8/grade 5 is a medium strength steel bolt and that’s why titanium outperformed it. Had it been a grade 8 bolt it would have easily outperformed titanium.