Types of Stresses
Stresses can be classified according to the following ways:
• Based on the dimensionality or the type of body on which they act
o Uniaxial (one - dimensional): eg., stresses in the thin rod, wires etc.
o Biaxial (two - dimensional): eg., Thin plate subjected to in-plane loading.
o Triaxial (three - dimensional): eg., Hydrostatic pressure
• Based on the nature of the stress
o Direct/normal stress
o Transverse/shear stress
• The resultant stress vector can be resolved into three mutually perpendicular
components, one along the normal to the cut section and the other two
parallel (transverse) to the surface.
• The normal component of the stress is called normal stress and is denoted
• The transverse component of stress are called shear stress and are denoted
• The direct stress has the tendency to deform the body (compress or expand)
without any change in shape of the body.
• Other the other hand, the shear stresses tend to distort the body resulting in
a change of shapes and angle.