Question

The stress at which elongation of a material is quite large as compared to the increase in load is known as

Answer 1

This is known as the yield point.

This means the material has given in to the applied force.

At this point the material change becomes permanent even when the load or force is removed.

For us to know when we have reached the yield point, we plot a strain - stress curve.

Every material has a unique curve for this.

Just to understand :

Stress is the force or rather the load whereas strain is the measurement of deformation.