24hourcampfire.com
24hourcampfire.com
Previous Thread
Next Thread
Print Thread
Hop To
Joined: Oct 2009
Posts: 1,771
H
Campfire Regular
OP Offline
Campfire Regular
H
Joined: Oct 2009
Posts: 1,771
I tried to find the answer but it’s all in Engineer speak which I don’t understand. Simply stated, which Is less likely to bend along its length .120 wall 2x2 or .120 wall 1x3 (using the 3” side)

Which will resist twisting the best?

BP-B2

Joined: May 2004
Posts: 55,889
Campfire Kahuna
Offline
Campfire Kahuna
Joined: May 2004
Posts: 55,889
Define 'bend'.

If the 1x3 is carrying the load with the 3" side bearing the stress it will resist better than the 2x2, otherwise the 2x2 wins. Not unlike how an I-beam works


I am..........disturbed.

Concerning the difference between man and the jackass: some observers hold that there isn't any. But this wrongs the jackass. -Twain


Joined: Mar 2001
Posts: 1,793
Campfire Regular
Offline
Campfire Regular
Joined: Mar 2001
Posts: 1,793
the square tube. By a lot.


Sean
Joined: Apr 2011
Posts: 150,187
Campfire Savant
Offline
Campfire Savant
Joined: Apr 2011
Posts: 150,187
Originally Posted by DigitalDan
Define 'bend'.

If the 1x3 is carrying the load with the 3" side bearing the stress it will resist better than the 2x2, otherwise the 2x2 wins. Not unlike how an I-beam works



The square tube

Last edited by hanco; 02/11/20.
Joined: Jun 2019
Posts: 9,687
H
Campfire Outfitter
Offline
Campfire Outfitter
H
Joined: Jun 2019
Posts: 9,687
1X3 will twist like a coil spring but it will carry more downforce with the wide side vertical. What are you building? We used a lot of 2X5 tubing for building round track race car frames, with appropriate cross bracing and roll cages. It's strong, and fairly lightweight.
Jerry


Ignorance can be fixed. Stupid is forever!
IC B2

Joined: Mar 2001
Posts: 1,793
Campfire Regular
Offline
Campfire Regular
Joined: Mar 2001
Posts: 1,793
I don’t have tables for tube that small so I compared 4x4x1/4 and 6x2x1/4, which are both double the size you are looking at. The 4x4 is 4 times as stiff in bending as the 6x2 bent the weak way, about the same as the 6x2 bent the strong way. And twice as torsionally stiff.

So the same result hold true for the shapes you are looking at, at roughy the same ratios.


Sean
Joined: Oct 2009
Posts: 1,771
H
Campfire Regular
OP Offline
Campfire Regular
H
Joined: Oct 2009
Posts: 1,771
Basically a swing out hitch haul. Didn’t want to overbuild it to the point that it weighs 100lbs but I also don’t want to put something heavy on it and twist it all to hell if I hit a big bump.

Joined: Dec 2002
Posts: 25,682
I
Campfire Ranger
Offline
Campfire Ranger
I
Joined: Dec 2002
Posts: 25,682
Check out the Aluminum hitch hauls at Harbour Freight. It might be less than the cost of materials to build your own.


People who choose to brew up their own storms bitch loudest about the rain.
Joined: Feb 2013
Posts: 6,435
Campfire Tracker
Offline
Campfire Tracker
Joined: Feb 2013
Posts: 6,435
1X3 will support more than a 2x2 with same thickness and material.

Joined: Oct 2009
Posts: 1,771
H
Campfire Regular
OP Offline
Campfire Regular
H
Joined: Oct 2009
Posts: 1,771
The more research I do, the further down the rabbit hole I go. Here’s what I think I understand... In laymen’s terms, I can treat each tube as a “ I -beam” in that the top and bottom of the tube is treated like the flange on a beam. The wider the flange, the more torsional stability the tube has. The taller the web (side wall of the tube) the stronger the resistance to deflection longitudinally. So the 2x2 better for torsional forces (twisting) and the 1x3 is better for less longitudinal deflection (sag).

Now an engineer will chime in and tell me everything I think I understand...is wrong

IC B3

Joined: Jun 2019
Posts: 9,687
H
Campfire Outfitter
Offline
Campfire Outfitter
H
Joined: Jun 2019
Posts: 9,687
Engineers built the "unsinkable" Titanic.
Jerry


Ignorance can be fixed. Stupid is forever!
Joined: May 2011
Posts: 889
3
Campfire Regular
Offline
Campfire Regular
3
Joined: May 2011
Posts: 889
Using simple beam theory (stress = My/I), for a given simple bending scenario and same applied loads/boundary conditions, I'm seeing the 1x3 tubing developing about 90% of the stress as the 2x2. So yes the 1x3 is stiffer (in bending) for Hookean materials assuming elastic conditions are maintained.

Joined: Nov 2011
Posts: 4,885
4
Campfire Tracker
Offline
Campfire Tracker
4
Joined: Nov 2011
Posts: 4,885
Originally Posted by Hotrod_Lincoln
Engineers built the "unsinkable" Titanic.
Jerry


Amateurs built the arc!

Joined: Jun 2019
Posts: 9,687
H
Campfire Outfitter
Offline
Campfire Outfitter
H
Joined: Jun 2019
Posts: 9,687
Originally Posted by 45_100
Originally Posted by Hotrod_Lincoln
Engineers built the "unsinkable" Titanic.
Jerry


Amateurs built the arc!


Yeah, but they had a better engineer supervising the construction!
Jerry


Ignorance can be fixed. Stupid is forever!
Joined: Apr 2008
Posts: 2,251
Campfire Regular
Offline
Campfire Regular
Joined: Apr 2008
Posts: 2,251
Originally Posted by 32_20fan
Using simple beam theory (stress = My/I), for a given simple bending scenario and same applied loads/boundary conditions, I'm seeing the 1x3 tubing developing about 90% of the stress as the 2x2. So yes the 1x3 is stiffer (in bending) for Hookean materials assuming elastic conditions are maintained.


I see what you did there...

Joined: Nov 2011
Posts: 4,885
4
Campfire Tracker
Offline
Campfire Tracker
4
Joined: Nov 2011
Posts: 4,885
Originally Posted by Hotrod_Lincoln
Originally Posted by 45_100
Originally Posted by Hotrod_Lincoln
Engineers built the "unsinkable" Titanic.
Jerry


Amateurs built the arc!


Yeah, but they had a better engineer supervising the construction!
Jerry


Agreed

Joined: Apr 2010
Posts: 834
C
Campfire Regular
Offline
Campfire Regular
C
Joined: Apr 2010
Posts: 834
Hands down round tube is stronger.

Joined: Dec 2014
Posts: 8,969
F
Campfire Outfitter
Offline
Campfire Outfitter
F
Joined: Dec 2014
Posts: 8,969
There is a reason modern high stress crane booms are built with round tubing.


Well this is a fine pickle we're in, should'a listened to Joe McCarthy and George Orwell I guess.
Joined: Sep 2007
Posts: 16,522
R
Campfire Ranger
Offline
Campfire Ranger
R
Joined: Sep 2007
Posts: 16,522
Originally Posted by hunter4623
Basically a swing out hitch haul. Didn’t want to overbuild it to the point that it weighs 100lbs but I also don’t want to put something heavy on it and twist it all to hell if I hit a big bump.



Delete. Unnecessary post.

Last edited by Rooster7; 02/12/20.

The deer hunter does not notice the mountains

"I fear all we have done is to awaken a sleeping giant and fill him with a terrible resolve" - Isoroku Yamamoto

There sure are a lot of America haters that want to live here...




Moderated by  RickBin 

Link Copied to Clipboard
YB23

Who's Online Now
238 members (1Longbow, 12344mag, 160user, 257 roberts, 257 mag, 10Glocks, 25 invisible), 1,859 guests, and 873 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums81
Topics1,187,728
Posts18,400,800
Members73,822
Most Online11,491
Jul 7th, 2023


 







Fish & Game Departments | Solunar Tables | Mission Statement | Privacy Policy | Contact Us | DMCA
Hunting | Fishing | Camping | Backpacking | Reloading | Campfire Forums | Gear Shop
Copyright © 2000-2024 24hourcampfire.com, Inc. All Rights Reserved.
Powered by UBB.threads™ PHP Forum Software 7.7.5
(Release build 20201027)
Responsive Width:

PHP: 7.3.33 Page Time: 0.099s Queries: 14 (0.002s) Memory: 0.8762 MB (Peak: 1.0044 MB) Data Comp: Zlib Server Time: 2024-03-29 10:41:36 UTC
Valid HTML 5 and Valid CSS