Dimensioning of hollow square and circular rod

In summary, determining the dimensions for a square hollow rod and circular hollow rod depends on the way the load is applied and there is a trade-off between outer dimension and wall thickness. For a telescopic rod made of S235JR Low Carbon Steel, with a length of 2.26 m and subjected to compression and bending forces, the round tube would need to have cross-sectional dimensions of either 216 x 5 mm, 197 x 6 mm, 182 x 7 mm, 171 x 8 mm, or 155 x 10 mm. These dimensions were calculated based on the load requirements for supporting a boat in a boat rack.
  • #1
JohnnyR
3
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?
 
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  • #2
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.
 
  • #3
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
 
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  • #4
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​
 
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FAQ: Dimensioning of hollow square and circular rod

What is the purpose of dimensioning a hollow square and circular rod?

Dimensioning is the process of determining and specifying the measurements and tolerances of a part. In the case of a hollow square and circular rod, dimensioning is important for ensuring the proper fit and functionality of the part in a larger assembly.

How do you dimension a hollow square and circular rod?

The dimensioning process involves measuring and specifying the length, width, and height of the part, as well as any necessary tolerances. In the case of a hollow square and circular rod, the dimensions of the outer and inner diameters, as well as the wall thickness, must be accurately measured and specified.

What is the difference between dimensioning a hollow square and circular rod?

The main difference between dimensioning a hollow square and circular rod is in the shape and measurements. A square rod will have equal dimensions for its width and height, while a circular rod will have a single diameter measurement. Additionally, the dimensioning for a hollow rod will include the measurement of the inner and outer diameters and the wall thickness.

How do you determine tolerances for a hollow square and circular rod?

Tolerances for a hollow square and circular rod are determined based on the specific application and requirements of the part. These tolerances can be specified by the designer or engineer and must take into account the function and fit of the part within the larger assembly.

What are some common issues that can arise with dimensioning a hollow square and circular rod?

Some common issues that can arise with dimensioning a hollow square and circular rod include incorrect measurements, unclear or inconsistent tolerances, and improper fit within the assembly. It is important to carefully and accurately dimension the part to avoid these issues and ensure proper functionality.

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