Concept of Stress

In general there are two types of forces act on a body. They are

  1. Internal forces
  2. External forces
  • Internal forces are the forces which are set up in the body due to externally applied force.
  • The internal force set up in the body per unit area is known as stress.
  • The external forces acting on the body are due to pressure exerted by one body on the other body or due to hydraulic pressure or atmospheric pressure.
  • The amount of force due to pressure exerted by one body over other body or due to hydraulic pressure or atmospheric pressure per unit area is known as applied stress.
  • The SI Unit of stress is N/m2
  • Stress is a scalar quantity.

Principal stress

The plane on which shear stress is zero is called as principal plane and the normal stress acting on the principal plane is known as principal stress.

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