Difference Between Stress and Strain in Mechanical Engineering

In mechanical engineering, stress and strain are two important concepts that describe the response of a material to applied forces. The main difference between stress and strain is:

Stress:

Stress is the internal resistance of a material to deformation under external forces. It is typically measured in force per unit area (Pa or psi). There are various types of stress, including tensile stress, compressive stress, and shear stress.

Strain:

Strain is the measure of deformation of a material relative to its original size. It is dimensionless and represents the amount of deformation experienced by the material due to stress. Strain can be either elastic, plastic, or viscous depending on the material's properties.

Overall, stress and strain are closely related concepts in mechanical engineering and are used to analyze and design structures and components under different loading conditions.