Difference Between Pressure and Stress | What is Stress | What is Pressure |Stress in Engineering

 

 -: Pressure and Stress :

Pressure  :-

• Pressure represents the intensity of external or outside forces exerting or acting at a point. 
• in other words - it is the amount of external force applied per unit area.
• Magnitude of the Pressure at a point, remains same in all the direction.   
• Due to pressure Stress will be developed.

        Pressure = F/A          in N/meterSq.

where F = External  applied force (external)  in N

            A = Area in  meterSq. 

Stress :-

• Stress is the intensity of internal resisting forces (to oppose the applied pressure) developed at a point. 
• in other words - it is a internal resistive force to deformation per unit area.
• Stress may act either normal or parallel to the surface. 
• Magnitude  of the stress at a point is unequal in all the directions.
• Stress can be Tensile, Compressive or Shear type.
• Due to stress Pressure will not be developed.

           Stress = F/A         in N/meterSq.

where F = internal resistive force developed (external)  in N

           A = Area in  meterSq. 

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