Force acting on the contact area?

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SUMMARY

The discussion focuses on calculating the force acting on the contact area between two circular blocks in an assembly process, specifically using the formula F=PA, where F is force, P is pressure, and A is the sectional area. The pressure applied to block 2 is 330 bar, while block 1 has a diameter of 242 mm and block 2 has a diameter of 170 mm. The hardness values of the blocks are 45 and 35, respectively. Participants emphasize the need for additional information regarding dimensions and forces to accurately determine the forces acting on the blocks.

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  • Understanding of pressure calculations in mechanical systems
  • Familiarity with the formula F=PA for force calculations
  • Knowledge of material properties, specifically hardness
  • Basic geometry of circular shapes and sectional areas
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Mechanical engineers, assembly process designers, and anyone involved in calculating forces in mechanical systems involving circular components.

Rahul Baro
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TL;DR
Hi, I have one doubt actually.
I have a cut section here, two blocks, on the right block you have a pressure of 300 bar acting on it. I want to calculate the force/stress on the contact area between the two blocks. I would request you to help me please.
Material - SS 316
 

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Welcome, Rahul.
You need to calculate the sectional area upon which that pressure is acting.
##F=PA##
You will also need the angle of the surfaces in contact.
 
Lnewqban said:
Welcome, Rahul.
You need to calculate the sectional area upon which that pressure is acting.
##F=PA##
You will also need the angle of the surfaces in contact.
I am not sure about the sectional area. what should i consider it as? and how the angle will effect here ? can you please tell
 
The only numerical value you have provided is a pressure.
But the diagram is a perpendicular section that has no area.
We need more information.

1. Is this a hydraulic seal or maybe part of an assembly process?
2. Is the section cut through part of a rectangular or a circular block?

3. What material is block 1?
4. What are the dimensions of block 1?

5. What material is block 2?
6. What are the dimensions of block 2?
7. What force is applied to block 2?
 
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The diagram does not show all the forces acting on block 1 if it is in equilibrium.
 
Baluncore said:
The only numerical value you have provided is a pressure.
But the diagram is a perpendicular section that has no area.
We need more information.

1. Is this a hydraulic seal or maybe part of an assembly process?
2. Is the section cut through part of a rectangular or a circular block?

3. What material is block 1?
4. What are the dimensions of block 1?

5. What material is block 2?
6. What are the dimensions of block 2?
7. What force is applied to block 2?
Its a part of an assembly process.
section cut through is a part of a circular block.
Hardness of block 1 is 45 and hardness of block 2 is 35.
the diameter of block 1 is 242mm and diameter of block 2 is 170mm.
the pressure coming on block 2 is 330bar.
block 2 is stationary
 
Last edited by a moderator:
Chestermiller said:
The diagram does not show all the forces acting on block 1 if it is in equilibrium.
The block one is kept stationary and only a pressure of 330 bar is applied on block 2
 
Rahul Baro said:
The block one is kept stationary and only a pressure of 330 bar is applied on block 2
Then why do you show 300 bar applied to block 1 ?

You give the pressure but not the area.
The pressure multiplied by the area will be a force.
That force will be transferred from block 1 to block 2.
Block 2 must be restrained somehow.
Block 2 cannot float in space.

If the blocks are circular, then please show a full sketch with all dimensions.

There is insufficient information to understand or answer the question.
 
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