Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Leaf spring alternative design

  1. Jan 10, 2015 #1
    to make leaf spring we can use any plastic materials ? what are strong plastics? please find it friends
     
    Last edited by a moderator: Jan 12, 2015
  2. jcsd
  3. Jan 10, 2015 #2

    Doug Huffman

    User Avatar
    Gold Member

    Kevlar is strong in tension. Layered with a plastic strong in compression makes a good plastic spring - though commonly expressed as a bow strung for shooting arrows. Similar shape, same technology.
     
  4. Jan 10, 2015 #3

    Baluncore

    User Avatar
    Science Advisor

    Welcome to PF.
    You cannot expect the members of PF to search for a new special spring material just because you hate steel.
    If you have a new material or technology then please let us know. We will review your suggestion.
     
    Last edited by a moderator: Jan 12, 2015
  5. Jan 11, 2015 #4
    what use would the leaf springs have? if its automotive i'd be surprised that the engineers creating super-cars would not have already tested the longevity of plastics for leaf springs under the loads a car would create simply to drop more useless weight from the cars (springs are a big weight in cars made mostly of kevlar.)
     
  6. Jan 12, 2015 #5

    OCR

    User Avatar

    You probably mean... fibre-reinforced plastics ?

    If so, then yes...

    http://en.wikipedia.org/wiki/Corvette_leaf_spring
     
    Last edited: Jan 12, 2015
  7. Jan 12, 2015 #6
  8. Feb 6, 2015 #7
    Hey OCR, just want to state my admiration for Carroll Smith.
    He took the fight for Ford to Ferrari and beat them at Lemans.
    The man was a genius and an real Engineer "In Theory And Practice".
    His books taught me so much when we started racing Formula Fords.
    May He rest in Peace!

    (sorry to go off subject here)

    DC
     
  9. Feb 7, 2015 #8

    Baluncore

    User Avatar
    Science Advisor

    Since the 1970s, airbag suspension systems have been gradually replacing leaf springs.

    The leaf spring is simple and locates the axle relative to the vehicle body. Without a leaf spring there needs to be a swing arm with some additional sway control structure. The quality of the steel in a swing arm is lower than that needed for a spring because the continuous flexing does not lead to fatigue cracking as it does in springs. Unlike a leaf spring, the swing arm can benefit from the use of a hollow section.

    The competition is not for a better material for leaf springs, but for a more durable and resilient rubber material.
     
  10. Feb 11, 2015 #9

    cjl

    User Avatar

    Not normally. Most cars use some kind of strut or double wishbone design with steel coil springs. Airbags are uncommon.
     
  11. Feb 11, 2015 #10

    Baluncore

    User Avatar
    Science Advisor

    Coil springs are better behaved than leaf springs because they do not need to be tapered or laminated.

    Leaf springs have been gradually disappearing. In light cars, leaf springs are usually replaced with coil springs. But in heavy vehicle suspension systems, leaf springs have been widely replaced by airbag suspension. Airbag suspension does less damage to the road than leaf spring suspension. Airbags permit higher tyre pressures which reduces sidewall flexing, they lower tyre temperature which extends tyre life. Airbag suspension is also easily adjustable.
     
  12. Feb 11, 2015 #11

    cjl

    User Avatar

    Do trucks use air suspension typically then? That's fascinating - I didn't know that. I was purely referring to passenger cars, where coils are the most common spring type right now.
     
  13. Feb 11, 2015 #12

    Baluncore

    User Avatar
    Science Advisor

    Airbag suspension is more expensive than coil springs.
    Take a look at this; http://en.wikipedia.org/wiki/Air_suspension

    Discussion re: the advantages to heavier vehicles; http://4wdaction.com.au/forum/viewtopic.php?f=10&t=97961&start=30 [Broken]

    To see the availability of retro-fit bags for cars … google; airbag suspension kits
     
    Last edited by a moderator: May 7, 2017
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Leaf spring alternative design
  1. Parabolic Leaf Springs (Replies: 1)

Loading...