State hooke’s law. Define Poisson’s ratio. State the SI unit Dimensions of strain.
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Answer:
Hooke's law is a law of physics that states that the force needed to extend or compress a spring by some distance (x) scales linearly with respect to that distance—that is, where k is a constant factor characteristic of the spring, and x is small compared to the total possible deformation of the spring.
Formula = Fs = -kx
Fs = spring force
K = spring constant
x = spring stretch
Poission's Ratio
In materials science and solid mechanics, Poisson's ratio is a measure of the Poisson effect, the deformation of a material in directions perpendicular to the direction of loading. The value of Poisson's ratio is the negative of the ratio of transverse strain to axial strain.
SI unit of strain
The unit for strain in the SI (Système International) is “one” i.e. 1 ε= 1 = 1 m/m. In practice, the “unit” for strain is called “strain” and the symbol e is used. Usually, strain is in the order of um/m, i.e. 10-6, and therefore, the unit “µε” (microstrain) is most commonly used.
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