What is Strain

What is Strain?

Strain

(ε)

Change per unit length in linear dimension, usually expressed as a percentage.

Stress

(σ)

Load on a specimen divided by the cross-sectional area through which it acts.
F/A

stress strain curve

The complete stress-strain curve is important because it allows you to know not only the maximum stress and strain a material can handle, but also important properties such as stiffness and yield (where the material becomes completely deformed), and ultimately, how the material will behave in use.

Rubber Bands

Why is Strain Important?

Have you considered the consequences of not measuring strain properly?

Fork                  Bag                  Railroad                  Strap

strain curve

Types of Strain Measurement

 

There are more than 14 ways to measure strain

Are you using the best method?

14 Ways to Measure Strain