Calculate Elongation of Steel Bar

This construction video tutorial focuses on the following topics :-

a. Finding out the elongation of bar as soon as the load is applied
b. The elongation of a steel rod under a specific load
c. The source from which the formula for elongation is derived

Elongation stands for a mechanical property of metal i.e. the degree to which a material is supposed to be delivered, stretched, or compressed prior to rupture. It is a point among tensile strength and yield strength and is presented as a percentage of the original length.

In this video, the solution is given to the following problem :

Problem: Find out the length of a mild steel rod after providing 100 kips force/load. Suppose the diameter and length of rod are ½” and 36 inches.

The following formula is used to provide the solution :-

Elongation = FL/AE
Here F stands for applied force/load
L stands for the length of the specified rod
A stands for cross sectional area of the rod

E stands for the modulus of elasticity of the material
Here, all the values are given except cross sectional area :-
The cross sectional area is determined with the following formula :-
A = πD2 /4

To learn the complete process, watch the following video.

Video Courtesy: SL Khan