Stress
When a force acts on a body tending to produce deformation, a resistance is developed to this external force application.
Definition: It is the Internal resistance to the externally applied force.
. It is denoted by (σ)
. Stress (σ)= Force/Area (fig.1).
. Pascal = 1 N / m².
. Commonly stress is reported in terms of mega Pascals (MPA).
MPA=10
Types of stresses
1. Axial stresses
Compressive stress
Compression results when the body is subjected to two sets of forces directed towards each other in the same straight line. (fig.2)
Tensile stress
Tension results in a body when it is subjected to two sets of forces directed away from each other in the same straight line. (fig.2)
Types of axial stresses
• Axial Compressive
. Tensile
2. Non axial stresses
Shear stress
Shear is the result of two sets of forces directed towards each other but not in the same straight line (fig.3)
Torsion
It results from the twisting of the body. (fig.3)
Bending
It results by applying bending movement.(fig.3)
Types of non axial stresses
• Non Axial
Shear
Torsion
Bending
