8. Define (a) stress and (b) strain. Write Hooke's Law of elasticity. A metal wire hangs from a base ! Hanging its free and is gradually its behaviour with the help of a nominated the on increased! So describe its behaviour with the help of a nominated stress-sales graph?. please give the full correct answer in details . don't give useless answers please
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Answers
On gradually increasing the load attached to the wire, the behaviour of the wire changes. At any point in time, we can measure, stress and the corresponding strain.
Initially stress is directly proportional to strain and Hooks law is obeyed in this region. The region OA is said to be elastic. The point A is called elastic limit.
On further increasing the load attached to the wire, a small increase in stress causes a large increase in strain. This region AA1 is said to be partly elastic and partly plastic.
At the point B called Yield point, the strain begins to increase without the change in stress. The tangent to the point B is parallel to strain.
Next region is called the break down region, where on loading the wire, the wire becomes thin and breaks. The point C at which the wire breaks is called breaking point.
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