I'm working on some Titanium Bars...

Willhouse [SLC SIG SCOOT]

Willhouse [SLC SIG SCOOT]

Member
Alright I'll take all fo this in too consideration (Not really, just gonna go to my local ti bike making company and ask em a few questions. xD). Thanks for contributing though. I'll try to find a good priced bulk ammount of titanium, because bulk is insanely cheap.
 
GoGzS

GoGzS

Bronze member
Everyone talking about strenght to weight ratio... I LOL at you : ) Learn what ratios are...and what they say...

There are reasons why CroMo and Alu is used...

Also, PVC Pipes filled with concrete are quiet strong too...
 
Willhouse [SLC SIG SCOOT]

Willhouse [SLC SIG SCOOT]

Member
Michael Rankin said:
You won't be able to buy the Ti in bulk for a set of bars.
Click to expand...



Check at your local titanium fabricator. Back your facts up...
Secondly Michael, you can buy the tubing in bulk >.< {1}

As for the rest of you, I'm looking for legitimate reasons (not shit talk). When you say a fact you give me data on where it comes from. Other wise it means NOTHING.


Fact time!

1) Titanium is used in aerospace applications; (jet engines, missiles, and spacecraft) {2}
2) Titanium is in fact a strong, lustrous, corrosion-resistant, and low density metal. {2}
3) A metallic element, titanium is recognized for its high strength-to-weight ratio. {3}
4) Commercial (99.2% pure) grades of titanium have ultimate tensile strength of about 63,000 psi (434 MPa), equal to that of common, low-grade steel alloys, but are 45% lighter. {4}
5) Titanium is 60% more dense than aluminium, but more than twice as strong[6] as the most commonly used 6061-T6 aluminium alloy. {4}
6) Heat treated titanium becomes very weak and looses its bending memory {2} (Bending memory is a trait from very few metals that allows a metal (when bent) to resume its previous position).

Happy??? You guys must've pulled the brittle thing out of your ass.

Foot notes:
{1}Titanium Joe (Bulk offers)
{2}Titanium - Wikipedia
{3}Britannica Concise Encyclopedia
{4}Barksdale p738
 
GoGzS

GoGzS

Bronze member
Dude, you make it look so simple "x is stronger than y"
That's not the whole story mate, and since you're bragging that much about your knowledge, I don't see why you don't mention all the facts.

So let's assume you got 2 pieces of metal, same dimensions, same thicknes...
One is 3AL 2.5V Titanium, and the other is 4130 cromoly.

The ultimate tensile strength of the titanium piece -> 89,900 psi
The ultimate tensile strength of the cromoly piece -> 90,000 psi

But fact is, the titanium piece weights less, wich gives it a better strenght to weight ratio, but at the end, the cromoly piece is still stronger.

Now on to stiffness...

Stiffness is determined by a property called "elastic modulus"

Modulus for Titanium -> 15-16.5
Modulus for steel -> 30
Modulus for alu -> 10-11

So as we can see, steel (cromoly) is twice as stiff as Titanium.
While building bike frames, companies that use Ti or Alu, compensate this whit using pipes of a bigger diameter...but guess what, you have a fixed OD for the crossbar, and a fixed ID for the steertube, only way you'll compensate it, is with a bigger wall thickness...

I wouldn't want to be the one riding a 26" wide crossbar made of titanium, ther's a reason why I ride a FireEye mtb steerer made out of cromoly : )


But sure, you know it all, go ahead make the bars, it would be a honor for me if I could get a pair for testing too...if it fails, maybe you could really try PVC pipes filled with concrete...
 
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