STRESS AND STRAIN- DIRECT STRAIN

Strain symbol can be represented by,

If a bar is subjected to a direct load, then it will change its length. If the original length, L changes in its length by small changes, then the strain produced is:

Strain is thus a measure of the deformation of the bar and is dimensionless. Generally, the magnitude is so small that it is normally stated in microstrain. Alternatively, strain can be expressed as percent (%):