oadamo
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 posted on 3/1/08 at 11:07 PM |
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not locost at all
titanium chassis has it been done.
adam
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Mr Whippy
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| posted on 3/1/08 at 11:11 PM |
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good luck
read some articles on the SR71 and you'll see some slight issues, lightweight sure, easy to work forget it
personally I think the next step in 7 chassis design is a carbon tube version as per the fancy push bikes 
[Edited on 3/1/08 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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907
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| posted on 3/1/08 at 11:25 PM |
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Welding unobtainium is a very time consuming process.
Paul G
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twybrow
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| posted on 3/1/08 at 11:29 PM |
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For the relative cost and benefit, I just cant see why anyone would want to venture away from steel for a spaceframe like a 7. Surely you would be
better looking at taking weight out elsewhere?
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oadamo
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| posted on 3/1/08 at 11:36 PM |
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the welding not a prob i could do it in my spare time at work. iam already making a steel chassis. but i got talking today and it came up about making
it from titanium. so i might have a go at doing it. start from the ground up making everthing light brakes wheels the lot.
adam
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Mr Whippy
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| posted on 4/1/08 at 12:02 AM |
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Titanium is so last decade. Carbon nano tubes that's what you want. Or even create a nanobot workforce and get them to construct it atom by atom
into a pure diamond honey comb  
Fame is when your old car is plastered all over the internet
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worX
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| posted on 4/1/08 at 12:34 AM |
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Does Titanium have any fatigue issues like aluminium has?
Steve
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oadamo
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| posted on 4/1/08 at 01:29 AM |
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http://en.wikipedia.org/wiki/Titanium
Fatigue limit is a property of ferrous alloys and titanium alloys[1]. It is the constant amplitude (or range) of cyclic stress that can be applied to
a material without causing fatigue failure. Other structural metals such as aluminium, do not have a distinct fatigue limit and will eventually fail
even from small stress amplitudes. In these cases, a number of cycles (usually 107) is chosen to represent the fatigue life of the material. The
corresponding stress amplitude is then referred to as the "Endurance Limit". Typical values of the endurance limit (Se) for steels are 1/2
the ultimate tensile strength, to a maximum of 100 ksi. For irons, aluminums, and copper alloys, Se is typically .4 times the ultimate tensile
strength. Maximum typical values for irons are 24 ksi, aluminums 19 ksi, and coppers 14 ksi.
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02GF74
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| posted on 4/1/08 at 09:38 AM |
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just curious but ...
1. what is weight of typical steel chassis?
2. what wold be wieght of one manufactured using Ti?
3. Cost of making from steel?
4. Same for Ti?
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kikiturbo
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| posted on 4/1/08 at 10:01 AM |
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if anyone has some free cash itching in his pocket, may I suggest some more exotic and much more expensive steel tubing.... like 15CDv6 seamless....
 it is, oh, about 6x the price of 4130CrMo... or for the ultimate in steel coolness, CRW 1000N, cold drawn seamless stainless steel... with 1000
N/mm2 Tensile Strength.... just weld and polish..
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nick205
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| posted on 4/1/08 at 12:44 PM |
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Concentrating on using the best quality round tube and optimal chassis design would be far more effective than Ti IMHO. If you really wanted to go
mad you could even specify double or triple butted tubes (as used on cycle frames) to reduce the weight even further.
Use TIG welding or possibly even TIG braising to join the tubes.
Design the chassis around a fully integrated full roll cage.
Use aero profile tube for the wishbones etc. (e.g. nitram38's Mota Leira build)
Kevlar full floor/underbody panelling.
Carbon fibre body work.
etc. etc.
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twybrow
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| posted on 4/1/08 at 12:51 PM |
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PDF with details of
Cranfield Uni development carbon chassis
I have seen this thing up close, and it is some sturcutre! Certainly not at all locost, but a lovely route to go down if money is no object!
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donut
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| posted on 4/1/08 at 02:39 PM |
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Could you not poduce a kit of parts and bolt the titanium chassis together? No welding required
[Edited on 4/1/08 by donut]
Andy
When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
http://www.flickr.com/photos/andywest1/
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Syd Bridge
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| posted on 4/1/08 at 07:50 PM |
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Carbon Tubes......nahhh, been done!
Hexcel in between the tubes with a couple of layers of woven prepreg, forms a very stiff chassis. But, don't ask the price, as you could buy a
very nice Cateringvan for the same cost.
Cheers,
Syd.
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oadamo
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| posted on 6/1/08 at 04:13 PM |
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ive ordered some sample tubes. to see what size i can use. i might get away with 0.5mm wall. iam going to test it to see how strong this stuff really
is. before i even start to make anything out of it. we do a lot of this type of work at work but not out of tube. and i dont have to buy the wire as
the gaffa said i could use what i needed. game on.
adam
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