In praise of titanium - and Spa Cycles

[PhilDawson8270]

Thanks, got it. I started reading and the found some old-fashioned words like India Rubber. I scrolled back up and saw 1875. Now I am super-intrigued but will look at it in the morning. Thanks.

it is an early paper, but is free from the many complexities that cloud more modern academic research on the topic.

Just to note though, I'm not saying it's a perfect example, or totally correct as knowledge has progressed a lot since 1875 But it does have some interesting ideas on the simple principles of it.

 

[Citius]

I would like some fleshing out on my take of the rise of Ti as a consumer metal of choice. Can you list other events that glorified titanium?

You'll like this one http://www.motorcycle-usa.com/2006/01/article/memorable-motorcyles-bsa-titanium/

 

[PhilDawson8270]

I would like some fleshing out on my take of the rise of Ti as a consumer metal of choice. Can you list other events that glorified titanium?

In my opinion. The best general public use of Titanium, is medical usage. Because of Titanium, my arm is in 1 piece, since I have two 3" plates fitted in my forearm.

 

[midlife]

Sat here waiting for someone to mention KIc

Shaun

 

[Yellow Saddle]

You'll like this one http://www.motorcycle-usa.com/2006/01/article/memorable-motorcyles-bsa-titanium/

I think there is a book to be written about the social history of titanium as an engineering metal.

 

[Yellow Saddle]

In my opinion. The best general public use of Titanium, is medical usage. Because of Titanium, my arm is in 1 piece, since I have two 3" plates fitted in my forearm.

If you can't see it, you can't brag about it. A Ti exoskeletal device with lots of ornamental capscrews on the other hand....

 

[PhilDawson8270]

If you can't see it, you can't brag about it. A Ti exoskeletal device with lots of ornamental capscrews on the other hand....

I try to wear T-Shirts everywhere, but scars are fading now too I always hope that when I'm dead, gone, and cremated. My urn will rattle with the titanium. But knowing businesses these days, the implants will get weighed in

 

[mythste]

A couple of summations so far

- Ti isn't the most logical material for a bike frame
- that doesn't mean it's a "bad" material for a bike frame
- bikes have lots of variables
- bums have lots of variables
- some people need to lighten the fark up.

 

[midlife]

We can't use recycled titanium in humans at the moment AFAIK.

Titanium has poor shear strength, K wires are better for a lot if applications.

Shaun

 

[Pale Rider]

But knowing businesses these days, the implants will get weighed in

You are not wrong about that.

There is a company which collects metal replacement joints from crematoria for recycling.

There's not a lot of money in it, but the business model works on the basis the source material is free.

 

[Smurfy]

Why should I believe the article? Why do you believe it? Do you see a source quoted anywhere?

You don't have to believe anything. Just compile a list of Ti frames that are constructed from 6Al-4V tubing, and those that are constructed from 3Al-2.5V tubing, and see which is the longer list.

My argument is based on the fact that most structural titanium is of a specific type. It is the industry's bread-and-butter alloy.

Indeed, but there are good reasons why 3Al-2.5V is the dominant alloy in bicycle frames, even if small parts such as dropouts may be 6Al-4V.
http://www.sevencycles.com/buildingbike/techsupplement/ti.php
@Pale Rider may find the above link informative ^^^

Further, who said that welded steel frames do not suffer from cracks? I certainly didn't, but I do understand the role of lugs and how they are fitted to frame tubes and how working with them avoids exceeding the heat limits of CroMo steel.

Nice diversion, but my point was that you said in a previous post that fracture toughness had been sorted on steel frames by the use of lugs. Which of course was largely irrelevant, because lugged construction is now pretty much exclusively the preserve of custom builds.

Oh, and by the way, my lugged, steel, Trek 990 frame died of a crack in the top tube where the head tube lug ended. So you see, lugs can act as stress raisers, and crack initiation sites. I took the frame to a Trek dealer, with the magnetic particle inspection powder from work still present along the crack line, and they ordered me a new frame as a warranty claim.

But I guess for every answer you'll have another question

The answer is for you to stop posting incorrect and irrelevant content..........

like a child of certain age.

..........and have a bit of respect for people instead of posting insults.

 

[Cyclist33]

I'm sorry YS, but I still can't follow your logic. Your first post said, and I am paraphrasing / inferring than ali, steel and ti are all the same strength for a given weight. Surely that can't be right can it? (your phrase was along the lines twice as strong but double the weight ). Strong enough - well yes, but lighter for a given strength is a valid goal surely? Not a key issue with the pen thing

Presumably a cheaper way to shed more weight would be to lose weight by eating less lard.

 

[Cyclist33]

If you can't see it, you can't brag about it. A Ti exoskeletal device with lots of ornamental capscrews on the other hand....

The metacarpals would have to be carbon though.

 

[Cyclist33]

A couple of summations so far

- Ti isn't the most logical material for a bike frame
- that doesn't mean it's a "bad" material for a bike frame
- bikes have lots of variables
- bums have lots of variables
- some people need to lighten the fark up.

You forgot

- Some people need to post simplistic and incorrect summaries of complex discussions in order to win favour with an idiot herd.

 

[Venod]

http://www.sevencycles.com/buildingbike/techsupplement/ti.php

Thanks for the link, some nice bikes as well as the informative stuff,