Instituto Tecnológico de Ocotlán
Electromecánica Engineering Materials Mechanics
We will then define as Normal Stress Normal Stress (σ) a
the amount of force per unit area acting in the normal direction.
It can be expressed in the following area unit acting in the normal direction.
It can be expressed as follows: form
Normal stress and axial
strain
when the bar is stretched by the forces as P the stresses are tensio-tension stresses
if the direction of the forces is reversed the bar compresses.
Intensity of an effort or uniform in
a bar
Axial
deformation
A bar subjected to an axial tensile force will increase
its initial length" It can be seen that it is the same load
but with a greater length this increase its elongation will also increase.
Allowable stress
For many structures it is important that the material remains within the elastic range in order to avoid permanent
deformation when the loads are removed.