#1
|
|||
|
|||
just wondering ?
how much less would a chassis weigh if built in 2mm wall ali box section ?
|
#2
|
|||
|
|||
have a search but i think the general concencus was ali is a different material and has different properties so wouldnt be suitable
__________________
theres a box ! im not allowed in it ! i have to think outside ! |
#3
|
|||
|
|||
I'd expect Aluminium to show signs of fatigue stress a lot sooner than steel with worse results, based on when I was looking for a new push bike.
That said, it is used in aircraft structures, so I guess it's feasible? Damn expensive though I'd imagine! |
#4
|
||||
|
||||
Quote:
This has been discussed many times in several forums - the general opinion is that aluminium will suffer from fatigue cracking very quickly. It also age-hardens, which wouldn't help. So - OK for race cars, but not for road-going ones. |
#5
|
||||
|
||||
It would most probably way more to retain the require strength. The design does not lend itself to the material.
TT
__________________
You only get a woosh with a dump valve Build Thread Man Cave Mantiques Cecil Street Auto Repairs Garage Carlisle Build Cost £4181.65 - Last - Wheel Cylinders |
#6
|
|||
|
|||
Aircraft actually take more of a hammering than a road car, its the buid philosiphy that makes it work. Steel is more practical than ali for a road car (that does not have to fly!)
__________________
My Blog : leroysroadster.wordpress.com |
#7
|
||||
|
||||
planes are not welded for a start so there is no haz, they are made with screws rivets and glue. if you look back a bit into the history of planes there has been plenty of issues with ali fatigue look at the de Havilland Comet, they had a habit of falling apart in the air as did a fair few other planes that were conceived in the 50's. a lot of the new planes manufactured these days are made out of composite materials which are much stronger and lighter.
ali is a fantastic material but its really not suited to use on a chassis unless you can model it and do some fea to work out the issues due to the shortcomings of the material
__________________
My Roadster Is Finished NerNer....... Pigs can fly, you just have to carry them onto the plane. My Pictures http://s707.photobucket.com/user/ashgardiner/profile/ |
#8
|
||||
|
||||
Quote:
When I built/ designed ocean going yachts for a living before retiring, many designs were built either in steel or aluminum. But overall the ally went 30% in size, thickness etc to comply to the same scantling as steel, but still these yachts turned out much lighter than their steel counter parts.... Back to the subject at hand; since we use 25 x 25 x 1.6mm tube for the frame, a meter length will weigh about 1.256kg. The equivalent in ally to be used should be 25 x 25 x 2.0mm and a meter length will weigh about 0.52 kg. But to be absolutely safe you can up the ally to 25 x 25 x 3.0mm and a meter length will weigh only 0.78kg and a frame built of this over sized grade will be much stronger than the std steel frame and still be 38% lighter! |
#9
|
|||
|
|||
Quote:
I was thinking 2 to 3 mm myself...........wow 38% lighter ..........looks like a plan for my trackday car then |
#10
|
|||
|
|||
It might be a good idea to listen to leroybrown he knows what he is talking about when it comes to aircraft and the hammering they take
Arfon |
Thread Tools | |
Display Modes | |
|
|