Question

Describe Hooke’s Law with the use of a diagram and at least one example.

Answer 1

Answer) Hooke's law : It says that for axial loading the stress remains proportional to the strain until the elastic limit of the material is achieved, after that the law cease to exist. Until the hookes law is valid, because of elasticity behaviour of the material the graph remains linear between stress and strain representing that if loading stops straining stops. Example such as spring. rubber band , steel rod etc until elastic limit of these examples load will produce strain or displacement but after removing load these example return back to their original shape.

An example of steel rod while tension loading it draws linear prolfile until elastic limit as shown below

Above shown example of steel represents elastic limit at point B after which there occurs a permanent set in the material which will not allow the material to go back to its original shape(graph starts chainging shape) that means strain is still present even after the loading is removed therefore hookes law is not valid in these region.