Force acting on the contact area?

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Discussion Overview

The discussion revolves around the forces acting on two blocks in contact, specifically focusing on the pressure applied to one block and how it relates to the contact area and angles involved. Participants explore the implications of pressure in an assembly process involving circular blocks, seeking to clarify the necessary dimensions and conditions for analysis.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • Some participants emphasize the need to calculate the sectional area where pressure is acting, using the formula F=PA, and highlight the importance of the angle of the surfaces in contact.
  • Others express uncertainty about the sectional area and how the angle affects the situation, requesting clarification on these points.
  • Several participants note that the provided diagram lacks sufficient information, questioning whether the blocks are part of a hydraulic seal or an assembly process, and asking for details about the materials and dimensions of both blocks.
  • One participant points out that the diagram does not show all forces acting on block 1 if it is in equilibrium, suggesting that additional forces must be considered.
  • Another participant questions the inconsistency in the pressures applied to the blocks, noting that the pressure must be multiplied by the area to determine the force transferred between the blocks.
  • Participants request a full sketch with all dimensions to better understand the scenario, indicating that the current information is insufficient for a comprehensive analysis.

Areas of Agreement / Disagreement

Participants generally agree that more information is needed to analyze the situation effectively, particularly regarding dimensions and forces. However, there is disagreement about the interpretation of the pressures applied and the implications for the blocks' equilibrium.

Contextual Notes

Limitations include missing assumptions about the arrangement of the blocks, the specific nature of the assembly process, and the lack of a complete diagram with all relevant dimensions and forces.

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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