Stress & Strain

With reference to Elasticity, define the following terms : 1. Stress 2. Strain

On gradual loading , stress - strain relationship for a metal wire is as follows . Within proportionality limit , stress prop strain or, "Stress"/"strain" = a constant for the material of wire. If "Stress"/"Strain" is x in elastic region and y in the region of yield , then

On gradual loading , stress - strain relationship for a metal wire is as follows . Within proportionality limit , stress prop strain or, "Stress"/"strain" = a constant for the material of wire. Just on crossing the yield region, the material will have

On gradual loading , stress - strain relationship for a metal wire is as follows . Within proportionality limit , stress prop strain or, "Stress"/"strain" = a constant for the material of wire. Two wires of same material have length and radius (L,r) and (2L , r/2) . The ratio of their young's modulii is

According to Hooke's law of elasticity, if stress is increaed, the ratio of stress to strain

Define stress and strain?

Figure shows graph between stress and strain for a uniform wire at two different temperatures. Then

The stress and strain graphs for two materials, A and B are shown here. Answer the following :give reasons

Assertion: Ratio of stress and strain is always constant for a substance. Reason : This ratio is called modulus of elasticity .

Statement-1 : The value of moduli of elasticity is directly proportional to stress. Statement-2 : The value of moduli of elasticity is inversely proportional to strain. Statement-3 : The value of moduli of elasticiy is independent of magnitude of stress and strain.