Tube/Bar Rigidity: Which Offers Most?

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In summary, the poster is seeking advice on whether tubes or bars would offer more rigidity for a specific application. A thicker wall thickness would make a tube more rigid, but a solid rod would be even more rigid. However, the poster suggests considering a larger diameter for better rigidity. They also mention the importance of calculating deflection and considering other options that may be more expensive or require more effort to mount. Ultimately, the decision involves trade-offs.
  • #1
SGT Steel
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Hey guys,

Long time lurker, first time poster! Here is my query...

I need to send a load weighing 10-12kg down two horizontal, parallel, cantilevered, grade 316 stainless steel tubes -- or bars -- each between 3-4 feet in length, 3/4" in diameter, and spaced 85mm apart. What I'd like to know is; in this specific application, would tubes, or bars, offer the most rigidity? If tubes, would a thicker or thinner wall thickness offer the most rigidity?
 
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  • #2
A tube with a thicker wall is more rigid than a tube of the same outside diameter and material but with a thinner wall, but the solid rod of the same outside diameter and material is more rigid than the thick walled tube. However, I don't consider a 4 foot long 3/4 inch diameter cantilevered rod as being very rigid. Might want to consider a larger diameter depending on your
application.
 
  • #3
How much deflection is allowable?
There are many beam analysis calculators on the web or in CAD modellers, or you can do the math yourself for the specific element's cross sectional profile. If you did this, perhaps you would find better solutions than tubular or solid circular cross sections that would solve your deflection issue. But would perhaps be more expensive or require more effort to mount.

It's all a series of trade offs.
 

1. What is the definition of "rigidity" in the context of tubes and bars?

In the context of tubes and bars, rigidity refers to the ability of a material or structure to resist deformation under an applied force. In other words, it is a measure of how stiff or inflexible a tube or bar is.

2. Which type of structure is typically more rigid: tubes or bars?

In general, bars tend to be more rigid than tubes. This is because the cylindrical shape of a tube allows for more flexing and bending under stress, while the solid, rectangular shape of a bar provides more resistance against deformation.

3. What factors can affect the rigidity of a tube or bar?

The rigidity of a tube or bar can be affected by several factors, including the material it is made of, its dimensions (such as diameter or cross-sectional area), and the way it is supported or connected to other structures.

4. How does rigidity impact the strength of a tube or bar?

Rigidity and strength are closely related, but they are not the same thing. While a more rigid structure may be able to resist deformation better, it does not necessarily mean it is stronger. The strength of a tube or bar depends on a combination of factors, including its material, dimensions, and how it is loaded.

5. Can rigidity be increased in a tube or bar through design or structural modifications?

Yes, rigidity can be increased in a tube or bar through various design and structural modifications. These may include using a stiffer material, increasing the dimensions of the structure, or adding reinforcement such as bracing or trusses. However, these modifications may also increase the weight and cost of the structure.

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