What is a strain? The strain is a unit elongation. If there is a bar L and we suspended a load P which is axial, then the elongation takes place only due to the suspended load P. This may be a unit elongation. It is considered as dimensionless. This is also known as longitudinal strain and for that the expression can be written as

The exact knowledge of strain can easily be provided through the following diagram –

Here, you just need to understand the factor unit elongation, because if the load is small only then the strain produced a small distance, which is the exact resultant strain. Here, δ is the exact strain due to the loaded force P. In addition c Is also considered as the average strain of the provided object. There are some conditions where strain can be equal to the stress. So, to understand each factor fundamentals are important to clear first.

**Links of Previous Main Topic:-**

- Introduction to statics
- Introduction to vector algebra
- Two dimensional force systems
- Introduction concept of equilibrium of rigid body
- Friction introduction
- Introduction about distributed forces
- Area moments of inertia in rectangular and polar coordinates
- Mass moment of inertia introduction
- Work done by force
- Kinematics of particles
- Position vector velocity and acceleration
- Plane kinematics of rigid bodies introduction
- Combined motion of translation and rotation
- Rectilinear motion in kinetics of particles
- Work and energy
- Linear momentum
- Force mass acceleration
- Simple stress introduction

**Links of Next Mechanical Engineering Topics:-**