Bearing Stress of Hollow Tube w/ Pin & Force

In summary, for a hollow tube inside a hollow tube with a pin passing through both and a force pushing down on the innermost tube, the bearing stress on the holes is F/2. The equivalent reaction force would be F/4 since the pin is passing through 4 holes. For example, for a jack stand with a 36,000 pound load on it, the bearing stress for each hole would be 9000. The formula for bearing stress is F/td, where F is the load, t is the wall thickness of the tube, and d is the hole diameter.
  • #1
gomerpyle
46
0
For a hollow tube inside a hollow tube, with a pin passing through both and a force pushing down on the innermost tube, what would the bearing stress be on the holes (assuming tube wall thickness is equal)? Would the equivalent reaction force be F/4 since the pin is passing through 4 holes? So for example, say this is a jack stand with a 36,000 pound load on it. Would the bearing stress for each hole then be, 36,000/4 = 9000. Then bearing stress = F/td ? 9000/td Where t is wall thickness of tube and d is hole diameter?
 
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  • #2
No - it's F/2 for each hole .

Think of the pin as a simple beam with two applied loads and two reaction loads .
 
  • #3
Pin Loads.jpg
 
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1. What is bearing stress and how is it calculated?

Bearing stress is the amount of force that is applied per unit area on a material at a specific point. It is calculated by dividing the force applied by the area over which it is applied.

2. How does the presence of a hollow tube and pin affect the bearing stress?

The presence of a hollow tube and pin can distribute the force applied over a larger area, resulting in a lower bearing stress compared to a solid material. However, the design of the tube and pin must be carefully considered to ensure it can withstand the applied force without failure.

3. What are the factors that can affect the bearing stress of a hollow tube with a pin?

The factors that can affect the bearing stress of a hollow tube with a pin include the material properties of the tube and pin, the dimensions and geometry of the tube and pin, and the magnitude and direction of the applied force. Other factors, such as surface roughness and temperature, may also play a role.

4. How can we improve the bearing stress of a hollow tube with a pin?

To improve the bearing stress of a hollow tube with a pin, we can use materials with higher strength and stiffness, increase the thickness or diameter of the tube and pin, and optimize the design to distribute the force more evenly. Additionally, using lubrication and surface treatments can also help reduce the stress on the material.

5. What are the potential failure modes associated with bearing stress in a hollow tube with a pin?

The potential failure modes associated with bearing stress in a hollow tube with a pin include shear failure of the tube or pin, crushing of the tube or pin, and excessive deformation or plasticity of the material. The failure mode will depend on the material properties, applied force, and design of the tube and pin.

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