Dimensioning of hollow square and circular rod

AI Thread Summary
To determine the dimensions of square and circular hollow rods for a telescopic assembly, the load type—whether axial compression, tension, torque, or sideways deflection—must be considered. The design must balance outer dimensions and wall thickness while accounting for applied loads, including compression and bending. The specific application involves supporting a boat in a rack, factoring in both the boat's weight and wind forces. For a rod length of 2.26 m, suggested dimensions for the circular rod include options ranging from 155 mm outer diameter with 10 mm wall thickness to 216 mm with 5 mm thickness. Proper dimensioning is crucial for ensuring structural integrity and safety.
JohnnyR
Messages
3
Reaction score
0
Hi

Can someone tell me how to determine dimensions for a square hollow rod and circular hollow rod when the material and maximum load is known?
 
Engineering news on Phys.org
This will depend on the way the load is applied to the hollow member.
Is it axial compression or tension, torque or a sideways deflection ?
There is also a trade-off between outer dimension and wall thickness.
 
The applied load is compression and there is also bending.
It´s a telescopic rod with the circular rod inside the square rod and it´s standing vertically with an angle. The rod has to support a boat standing in a boat rack so it has to support the weight of the boat and the force from wind gust. The material is set to be S235JR Low Carbon Steel.
I hope you can help. Thanks.

http://imagizer.imageshack.us/v2/1024x768q90/833/drpm.jpg
 
Last edited by a moderator:
JohnnyR: If the length of your telescopic rod assembly is 2,26 m, and if your member forces in post 3 are correct, then it currently appears the round tube would need to have cross-sectional dimensions (outside diameter by wall thickness) as listed in any of the following options.

(1) 216 x 5 mm
(2) 197 x 6
(3) 182 x 7
(4) 171 x 8
(5) 155 x 10​
 
Last edited:

Thread 'A practical way to vaporize fuel for high MPG?'

Here's a video by “driving 4 answers” who seems to me to be well versed on the details of Internal Combustion engines. The video does cover something that's a bit shrouded in 'conspiracy theory', and he touches on that, but of course for phys.org, I'm only interested in the actual science involved. He analyzes the claim of achieving 100 mpg with a 427 cubic inch V8 1970 Ford Galaxy in 1977. Only the fuel supply system was modified. I was surprised that he feels the claim could have been...
View full post »

Thread 'Technical Analysis on Titan Sub (Titanic Sub)'

TL;DR Summary: Heard in the news about using sonar to locate the sub Hello : After the sinking of the ship near the Greek shores , carrying of alot of people , there was another accident that include 5 tourists and a submarine visiting the titanic , which went missing Some technical notes captured my attention, that there us few sonar devices are hearing sounds repeated every 30 seconds , but they are not able to locate the source Is it possible that the sound waves are reflecting from...
View full post »

Similar threads

B Vertical Compression Strength of Different Hollow Rods
Replies
24
Views
2K
Stronger or Stiffer? Tube vs Rod: Answers Here!
Replies
2
Views
2K
Maximum combustion chamber pressure and connector rod length
Replies
12
Views
1K
Can you me understand this mechanism?
Replies
5
Views
2K
How to calculate the weight of a submerged hollow cylinder?
Replies
3
Views
4K
Automotive Why Do BMW Engines Suffer from Rod Bearing Issues?
Replies
5
Views
234
Question about the mechanism of a fishing rod
Replies
7
Views
2K
Calculating Max Pull for M30x2mm Threads on Chrome Rod
Replies
7
Views
2K
Panel Structure vs. Solid Rod Structure
Replies
2
Views
2K
How Can Innovative Wheelchairs and Mobility Solutions Meet Client Needs?
Replies
23
Views
2K

Hot Threads

Recent Insights

Back
Top