It would be great if someone could help me quickly

Discussion in 'Community Discussion' started by SpookTheHamster, Mar 8, 2007.

  1. SpookTheHamster macrumors 65816

    SpookTheHamster

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    #1
    I need to find a wood from a developing country with a high Young's Modulus.

    Matweb doesn't have any woods that could be classed as from a developing country, unless you consider Taiwan or Mongolia developing.
     
  2. MongoTheGeek macrumors 68040

    MongoTheGeek

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    #2
    How about Mahogany?
     
  3. SpookTheHamster thread starter macrumors 65816

    SpookTheHamster

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    #3
    I found an arseload of them, I was forgetting to convert psi into Pa, so my numbers were wrong to begin with.
     
  4. Black&Tan macrumors 6502a

    Black&Tan

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    #5
  5. mkrishnan Moderator emeritus

    mkrishnan

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    Grand Rapids, MI, USA
    #6
    I think sandalwood comes in in the moderate range... like 2.3-2.7x10^10....
     
  6. SpookTheHamster thread starter macrumors 65816

    SpookTheHamster

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  7. Patmian212 macrumors 68020

    Patmian212

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    #8
    Sorry to stray off topic but isnt mongolia indeed a developing country?
     
  8. MongoTheGeek macrumors 68040

    MongoTheGeek

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    #9
    I would probably call it developing but I never thought of wood as one of its exports.
     
  9. SpookTheHamster thread starter macrumors 65816

    SpookTheHamster

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    #10
    The wood wouldn't be exported.

    We have to design a bridge for a 'developing country' that will use local wood for its main material. Obviously, I'm choosing where I place my bridge depending on where the wood is strongest, and those were the only two vaguely developing countries where wood listed on Matweb grows.
     
  10. Sesshi macrumors G3

    Sesshi

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    #11
    Practically speaking, I'd look at how the country in question historically or presently builds it's own bridges from local wood and look to it for clues in using the material. The wood in question may not have the optimum modulus for a 'reference' design but it is highly probable that local wisdom has come up with a way to use the available material to high potential.

    I don't know whether you'd get extra credit for doing that though - I presume it's for a school project of some sort.
     
  11. MongoTheGeek macrumors 68040

    MongoTheGeek

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    #12
    Remember though that young's modulus != strength. Its stiffness. You need to look at yield stress and density since one of the biggest weights on the bridge (especially when dealing with primitive materials is the bridge itself.

    /Remembers a HS class where we designed and built bridges
    //My team won
    ///Design was then quickly banned.
     
  12. Black&Tan macrumors 6502a

    Black&Tan

    Joined:
    Mar 4, 2004
    #13

    Do tell. Sounds interesting.

    Also, from the perspective of a non-engineering person, don't you want some flexibility in the structure? If it's stiff, how will it accommodate heavy loads or changes in the environment such as earthquakes. Also, wood tends to move constantly, contracting and expanding as the temperatures and humidity change. How do you compensate within your design?
     

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