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Strength of square tubing

  1. May 19, 2009 #1
    I am building a motorcycle trailer. I have 2 x 2 square tubing that is about 1/16 thick and it will be about 6 and 1/2 foot long the trailer will need to hold 433 that is how much my motorcycle weighs. Does any know of a site or somewere that I may find this information so that I can start on it. i just need to find out the weight that it will hold please post a site if you know one thank you
     
  2. jcsd
  3. May 19, 2009 #2
    please does someone know were i can find out this information.
     
  4. May 20, 2009 #3

    minger

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    If you draw us a picture, it might be quit helpful. In fact, you'll probably get some very useful information and numbers with a decent picture.
     
  5. May 20, 2009 #4
    how would i post a picture the only drawings I have are in auto CAD?
     
  6. May 21, 2009 #5
    CTRL + SHIFT + PRNT SCRN (takes a snapshot of your screen)

    paste into MS paint and save as a JPEG
     
  7. May 21, 2009 #6

    minger

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    Or I believe you can just straight export to a picture file. I haven't used AutoCad in years, but most solid modelers will let you export to a variety of image formats.
     
  8. May 21, 2009 #7

    FredGarvin

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    or print it to a PDF and post it here.
     
  9. May 21, 2009 #8

    Mech_Engineer

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    Keep in mind that the weight on the trailer will not just be the static weight of the bike, since while you're driving the bike will be subject to accelerations of perhaps 2-3g's. You'll want the trailer to be designed with a significant built-in safety factor. You'll also need to know more about the tubing you're using, specifically what material it is ("steel" won't be specific enough).
     
  10. May 21, 2009 #9

    nvn

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    antzgarcia: I agree with mooktank except only press Alt + PrtSc; then paste to Start > Programs > Accessories > Paint (which is MS Paint), and save as a .png file. (jpeg is for photographs; png is for graphics.)

    A dynamic amplification factor of 3 sounds good, probably. If you don't know more about your steel tube material, we could assume mild steel.
     
  11. May 22, 2009 #10

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  12. May 23, 2009 #11

    nvn

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    antzgarcia: I notice the half axle you are using is also a shock absorber. I think the minimum dynamic amplification we should use is daf = 2.50. And I think the minimum yield factor of safety we could use is FS = 1.70. We will see if anyone disagrees. Therefore, your square tube wall thickness is too thin for the rear beam spanning across your trailer. Using the above minimum factors and mild steel, you would need a rear beam wall thickness of t = 6.35 mm. However, using daf = 3.0 and FS = 2.0 would give you a rear beam wall thickness of t = 12.7 mm. If you could state the material specification of your square tubes, it might affect the answers.
     
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