Deflection
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: Deflection
: Deflection -- Jeb81	Post Reply	Top of thread	Engineering Forum

Posted by: Pinkerton ® 09/01/2010, 13:56:11 Author Profile eMail author Edit

You need to polish those spectacles a bit Jeb. Look to the right and up from your posting, "Engineering Calculators" would seem to do the trick. Is the 4" x 6" on it's side or edge? Point load? Several point loads? Evenly distributed? Shock load? How much load? Swinging load? If so, 4" x 6" would not be a good choice no matter what the deflection turned out to be. Dave

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: : Deflection -- Pinkerton	Post Reply	Top of thread	Engineering Forum

Posted by: Jeb81 ® 09/01/2010, 14:44:09 Author Profile eMail author Edit

Well I looked at the ones on the site and I can only find ones for a beam. I could be looking at it wrong but it doesnt have anywhere I can put in the size of the tubing. The 4"x6" would be to where the 4" is horizontal and the 6" is vertical. Im not sure if thats on its edge or side. The load will be 1000lbs distriduted evenly. Thanks.

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: : : Deflection -- Jeb81	Post Reply	Top of thread	Engineering Forum

Posted by: Pinkerton ® 09/01/2010, 19:45:32 Author Profile eMail author Edit

Anything can be a "beam" even tree trunk across a creek is a "beam". You need to calculate for the cross section etc and then use Moment of Inertia. Given your (I am assuming) structural design experience and the load you are intending to support, this is a job for a Structural Engineer. Sitting on the 4" side, it would be regarded as "on edge," for my terminology. At a 15' span and half-ton load, you would be advised to use some lateral support in the middle to prevent the tube twisting and rapidly exceeding it's load carrying capacity. Play safe and get an Engineer to design it. Watch this to see how a small amount of rotation in a beam load-direction can instantly reduce it's load carrying capacity. A 5 degree twist can reduce it by as much as 40%. http://www.youtube.com/watch?v=V8ZmOgMlyRE Notice the horizontal beams on the right side racks at around 40 seconds. Dave

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: : : : Deflection -- Pinkerton	Post Reply	Top of thread	Engineering Forum

Posted by: Kelly Bramble ® 09/01/2010, 20:12:25 Author Profile eMail author Edit

Holy moly! Dig me out!

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: : : : : Deflection -- Kelly Bramble	Post Reply	Top of thread	Engineering Forum

Posted by: Pinkerton ® 09/01/2010, 20:37:08 Author Profile eMail author Edit

Great example of beam failure eh? The guy that comes out of the left side near the end, do think he was the driver and dug his way out or just worker caught up in it? He seems to come from inside the heap. Dave Modified by Pinkerton at Wed, Sep 01, 2010, 20:39:17

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: : : : : : Deflection -- Pinkerton	Post Reply	Top of thread	Engineering Forum

Posted by: Pinkerton ® 09/02/2010, 10:05:04 Author Profile eMail author Edit

Jeb, There is another thing I forgot to mention. Unless there is a very good reason to use aluminum you will be throwing money away. The load carrying stiffness between steel and aluminum is pretty much the same on a weight for weight basis and the price of aluminum is about 3 times that of steel. Dave

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