Bending property solid metal pipe vs hollow metal pipe

In summary, the bending property of a solid pipe and a hollow pipe with the same diameter depends on the applied load, length, area moment of inertia, and modulus of elasticity. The tube with the larger area moment of inertia will have lower deflection and the tube with the smaller area moment of inertia will have higher deflection. In terms of fatigue, the hollow tube may have a shorter lifespan due to higher internal stresses for a given load and deflection. However, more information is needed to give a definitive answer.
  • #1
insatcool
2
0
i wanted the techinical information.
bending property of solid pipe and hollow pipe with same diameter.
which will bend more and why ?
i wanted the technical answer please help me out :smile:
 
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  • #2
If you look at a beam that is cantilevered and a force applied to the free end, the deflection of the beam at the end is calculated as:

[tex]\delta = \frac{PL^3}{3EI}[/tex] where

[tex]\delta[/tex] is the deflection
[tex]P[/tex] is the applied load
[tex]L[/tex] is the length from the fixed end
[tex]I[/tex] is the area moment of inertia
[tex]E[/tex] is the modulus of elasticity

So for two beams (one hollow and one not) of equal length, identical material and the same applied load, the only variable is the area moment of inertia. Since the deflection is inversely proportional to the area moment of inertia, the beam with the larger moment will have the lower deflection.

The tube will a lower area moment of inertia so it will deflect more.

What loading conditions and constraints were you thinking of?
 
  • #3
which rod (hollow or solid) will break at a apllied load (pressure) at a repeated frequency 1 min holding time and 10 mins withdrawal time ?
 
  • #4
insatcool said:
which rod (hollow or solid) will break at a apllied load (pressure) at a repeated frequency 1 min holding time and 10 mins withdrawal time ?
This is not a static deflection problem any more. It is now a fatigue issue. It depends completely on the load applied and if there is a static offset load (preload). Many situations have an infinite number of cycles that can be applied and not fail. I can't answer this question without a lot more information.
 
  • #5
Adding what Fred mentioned, the hollow tube (presumably of the same material and similar microstructure (which infers similar thermomechancial processing)) has less cross-sectional area, which means for a given load will have higher local stress, which implies more strain.

For fatique, for a given delection, the internal stresses will be greater in the hollow tube - which will generally reduce fatigue life for a given load/deflection.

And as Fred indicated, more information is needed to give a more definitive statement.
 

What is the difference between solid metal pipe and hollow metal pipe?

The main difference between solid metal pipe and hollow metal pipe is the presence of a hollow interior in the latter. Solid metal pipes are made of a single piece of metal, while hollow metal pipes have a hollow center. This makes them lighter and more flexible, but also less strong compared to solid metal pipes.

Which type of metal pipe is stronger?

Solid metal pipes are generally stronger than hollow metal pipes due to their solid construction. The lack of a hollow interior in solid metal pipes provides more support and resistance to bending or breaking under pressure. However, the strength of a metal pipe also depends on the type and quality of the metal used.

Can hollow metal pipes bend without breaking?

Yes, hollow metal pipes can bend without breaking due to their hollow interior. This allows them to flex and absorb pressure, making them more flexible compared to solid metal pipes. However, they have a limit to how much they can bend before breaking, and this may vary depending on the type and thickness of the metal.

Which type of metal pipe is better for specific applications?

The choice between solid metal pipe and hollow metal pipe depends on the specific application. Solid metal pipes are better for applications that require high strength and durability, such as structural support or carrying heavy loads. On the other hand, hollow metal pipes are better for applications that require flexibility and light weight, such as plumbing or electrical wiring.

Are there any advantages or disadvantages of using one type of metal pipe over the other?

The main advantage of using solid metal pipes is their strength and durability, making them suitable for heavy-duty applications. However, they are heavier and more expensive compared to hollow metal pipes. The main advantage of using hollow metal pipes is their flexibility and light weight, making them easier to install and transport. However, they may not be as strong as solid metal pipes and may have limitations in certain applications. Ultimately, the choice between the two depends on the specific needs and requirements of the project.

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